Chapter 45

a court of summary jurisdiction if she has been forced by cruelty to leave her husband or has been deserted by him.

United States.--Alimony is granted by the courts of the several states on much the same principle as in England, though in many states the courts of equity as such may grant alimony without divorce or separation proceedings independently of any statute, on the ground that it is just that the husband should support his wife when she lives apart from him for his fault, and since the courts of common law provide no remedy the courts of equity will. This is so in Alabama (Brady v. Brady, 1905, 39 So. Rep. 237), Kentucky, North Carolina, Iowa, California, Ohio, Virginia, South Dakota and the District of Columbia. In other states alimony without such proceedings is allowed by statute, and such alimony is now very general throughout the United States. The usual grounds for the allowance of it are desertion and such conduct as would amount to legal cruelty. After divorce a vinculo, alimony or separate maintenance is sometimes granted on good reason. The marriage must be proven as a fact, but a ``common law'' marriage, i.e. one established by cohabitation and repute, is sufficient. In several states alimony or maintenance is by statute allowed to the husband in certain cases out of the wife's property. This is so in Massachusetts, Virginia, Rhode Island and Iowa. In Oregon he is entitled to one-third of his wife's real estate in addition to maintenance on divorce for her fault. The amount of alimony depends upon the circumstances of each case as in England. Permanent alimony is generally more than when pendenite lite, and usually one-third the husband's income. It may generally be changed from time to time as the circumstances of the parties change. Judgment for alimony is considered a judgment in personam and not in rem, and can only be enforced outside the state where rendered in case the husband has been personally served with process within that state. The remarriage of the man is not sufficient ground for reducing the alimony (Smith v. Smith, 1905, 102 N.W. Rep. 631), but on remarriage of a woman to one able to support her, her former husband being in poor circumstances, it will be reduced (Kiralfy v. Kiralfy, 1901, 36 Wisc. N.S. 407).

ALIN, OSCAR JOSEF (1846--1900), Swedish historian and politician, was born at Falun on the 22nd of December 1846. In 1872 he became docent, and in 1882 professor of political economy at Upsala, of which university he was afterwards rector. In September 1888 he was elected a member of the first chamber of the Riksdag, where he attached himself to the conservative protectionist party, over which, from the first, he exercised great authority. But it is as a historian that Alin is most remarkable. Among his numerous works the following are especially worthy of note: Bidrag till svenska radets historia under. medeltiden (Upsala, 1872); Sveriges Historia, 1511-1611 (Stockholm, 1878); Bidrag till svenska statsrickets historia (Stockholm, 1884-1887); Den svensk-norsk Unionen (Stockholm, 1889-1891), the best book on the Norwego-Swedish Union question from the Swedish point of view; Fjerde Artiklen af Fredstraktaten i Kiel (Stockholm, 1899); Carl Johan och Sveriges yttre politik, 1810-1815 (Stockholm, 1899); Carl XIV. och Rikets Stander, 1840-1841 (Stockholm, 1893). He also edited Sveniska Riksdagsakter, 1521-1554 (Stockholm, 1887), in conjunction with E. Hildebrand, and Sveriges Grundlagar (Stockholm, 1892). He died at Upsala on the 31st of December 1900.

Obituary notice in Sv. Hist. Tidssk. (1901). (R. N. B.)

ALIPUR, a suburb of Calcutta, containing Belvedere House, the official residence of the lieutenant-governor of Bengal, and a number of handsome mansions. It lies within the limits of the south suburban municipality, and is a cantonment of native troops. On the Calcutta maidan, opposite Alipur Bridge, stood two trees under which duels were fought. It was here that the meeting in 1780 between Warren Hastings and Sir Philip Francis took place.

ALIQUOT (a Lat. word meaning ``some,'' ``so many''), a term generally occurring in the phrase ``aliquot part,'' and meaning that one quantity is exactly divisible into another; thus 3 is an aliquot part of 6.

ALIRAJPUR, a native state of India, under the Bhopawar agency in Central India. It lies in Malwa, near the frontier of Bombay. It has an area of 836 sq. m.; and a population (1901) of 50,185. The country is hilly, and many of the inhabitants are aboriginal Bhils. It has from time to time been under British administration. The chief, whose title is Rana, is a Rahtor Rajput. He has an estimated revenue of L. 8700, and pays a tribute of L. 700. The Victoria bridge at Alirajpur was built to commemorate the Diamond Jubilee of 1897.

ALISMACEAE (from the Gr. alisma, a water-plant mentioned by Dioscorides), in botany, a natural order of monocotyledons belonging to the series Helobieae, and represented in Britain by the water plantain, Alisma Plantago, the arrow-head, Sagittaria, the star-fruit, Damasonium, and flowering rush, Butomus (from the Gr. bous, ox, temnein, to cut, in allusion to leaves cutting the tongues of oxen feeding on them). They are marsh- or water-plants with generally a stout stem (rhizome) creeping in the mud, radical leaves and a large, much branched inflorescence. The leaves show a great variety in shape, often

FIG. 1.--Flowering Rush (Butomus umbellatus.) 1, Flower in vertical section; 2, horizontal plan of arrangement of flower.

the same plant, according to their position in, on or above the water. The submerged leaves are long and grass- like, the floating leaves oblong or rounded, while the aerial leaves are borne on long, thin stalks above the water, and are often heart- or arrow-shaped at the base. The flower-bearing stem is tall; the flowers are borne in whorls on the axis as in arrow-head, on whorled branchlets as in water plantain or in an umbel as in Butomus (fig. 1). The flowers are regular and rather showy, generally with three greenish sepals, followed in regular succession by three white or purplish petals, six to indefinite stamens and six to indefinite free carpels. The floral arrangement thus recalls that of a buttercup, a resemblance which extends to the fruit, which is a head of achenes or follicles. The flowers contain honey, and attract flies, short-lipped bees or other small insects by the agency of which pollination is effected. The fruit of Butomus is of interest in having the seeds borne over the inner face of the wall of the leathery pod (follicle). Damasonium derives its popular name, star-fruit, from the fruits spreading when ripe in the form of a star. It is a western

FIG. 2.--Water Plantain (Alisma Plantago.) Plant about 3 ft. high. 1, Flower; 2, same in vertical section; 3, horizontal plan of flower; 4, mature fruit.

Mediterranean plant which spreads to the south of England, where it is sometimes found in gravelly ditches and pools. The order contains about fifty species in fourteen genera, and is widely distributed in temperate and warm zones. Alisma Plantago (fig. 2), a common plant in Britain (except in the north) in ditches and edges of streams, is widely distributed in the north temperate zone, and is found in the Himalayas, on the mountains of tropical Africa and in Australia.

ALISON, ARCHIBALD (1757-1839), Scottish author, son of Patrick Alison, provost of Edinburgh, was born on the 13th of November 1757 at Edinburgh. After studying at the university of Glasgow and at Balliol College, Oxford, he took orders in the Church of England, and was appointed in 1778 to the curacy of Brancepeth, near Durham. In 1784 he married Dorothea, youngest daughter of Professor Gregory of Edinburgh. The next twenty years of his life were spent in Shropshire, where he held in succession the livings of High Ercall, Roddington and Kenley. In 1800 he removed to Edinburgh, having been appointed senior incumbent of St Paul's Chapel in the Cowgate. For thirty-four years he filled this position with much ability, his preaching attracting so many hearers that a new and larger church was built for him. His last years were spent at Colinton, near Edinburgh, where he died on the 17th of May 1839. Alison published, besides a Life of Lord Woodhouselee, a volume of sermons, which passed through several editions, and a work entitled Essays on the Nature and Principles of Taste (1790), based on the principle of association (see under AESTHETICS, p. 288). His elder son, Dr Wilham Pulteney Alison (1790-1859), was a distinguished Edinburgh medical professor.

SIR ARCHIBALD ALISON, Bart. (1792-1867), the historian, was the younger son, and was born at Kenley, Shropshire, on the 29th of December 1792. He studied at the university of Edinburgh, distinguishing himself especially in Greek and mathematics. In 1814 he passed at the Scottish bar, but he did not at once practise. The close of the war had opened up the continent, and Alison set out in the autumn of 1814 for a lengthened tour in France. It was during this period that the idea of writing his history first occurred to him. A more immediate result of the tour was his first literary work of any importance, Travels in France during the Years 1814-1815, written in collaboration with his brother and A. F. Tytler, which appeared in the latter year. On his return to Edinburgh he practised at the bar for some years with very fair success. In 1822 he became one of the four advocates-depute for Scotland. As a result of the experience gained in this office, which he held until 1830, he wrote his Principles of the Criminal Law of Scotland (1832) and Practice of the Criminal Law of Scotland (1833), which in 1834 led to his appointment by Sir Robert Peel to the office of sheriff of Lanarkshire, which ranks next to a judgeship in the supreme court. The office, though by no means a sinecure, gave him time not only to make frequent contributions to periodical literature, but also to write the long-projected History of Europe, for which he had been collecting materials for more than fifteen years. The history of the period from the beginning of the French Revolution till the restoration of the Bourbons in 1815 was completed in ten volumes in 1842, and met with a success almost unexampled in works of its class. Within a few years it ran through ten editions, and was translated into many of the languages of Europe, as well as into Arabic and Hindustani. At the time of the author's death it was stated that 108,000 volumes of the library edition and 439,000 volumes of the popular edition had been sold. A popularity so widespread must have had some basis of merit, and the good qualities of Alison's work lie upon the surface. It brought together, though not always in a well-arranged form, an immense amount of information that had before been practically inaccessible to the general public. It at least made an attempt to show the organic connexion in the policy and progress of the different nations of Europe; and its descriptions of what may be called external history--of battles, sieges and state pageants--are spirited and interesting. On the other hand the faults of the work are numerous and glaring. The general style is prolix, involved and vicious; mistakes of fact and false deductions are to be found in almost every page; and the constant repetition of trite moral reflections and egotistical references seriously detracts from its dignity. A more grave defect resulted from the author's strong political partisanship, which entirely unfitted him for dealing with the problems of history in a philosophical spirit. His unbending Toryism made it impossible for him to give any satisfactory explanation of so complex a fact as the French Revolution, or accurately to estimate the forces that were to shape the Europe of the 19th century. A continuation of the History, embracing the period from 1815 to 1852, which was completed in four volumes in 1856, did not meet with the same success as the earlier work. The period being so near as to be almost contemporary, there was a stronger temptation, which he seems to have found it impossible to resist, to yield to political prejudice, while the materials necessary for a clear knowledge of the influences shaping European affairs were not as yet accessible. The book is now almost wholly out of date. In 1845 Alison was chosen rector of Marischal College, Aberdeen, and in 1851 of Glasgow University. In 1852 a baronetcy was conferred upon him, and in the following year he was made a D.C.L. of Oxford. His literary activity continued till within a short time of his death, the chief works he published in addition to his History being the Principles of Population (1840), in answer to Malthus; a Life of Marlborough (1847, 2nd edition greatly enlarged, 1852); and the Lives of Lord Castlereagh and Sir C. Stewart (1861.) This latter, based on MS. material preserved at Wynyard Park, is still of value, not only as the only available biography, but more especially because Alison's Tory sympathies enabled him to give a juster appreciation of the character and work of Castlereagh than the Liberal writers by whom for many years he was misjudged and condemned (see LONDONDERRY, Robert Stewart, 2nd marquess of). Three volumes of Alison's political, historical and miscellaneous essays were reprinted in 1850. He died at Possil House, Glaagow, on the 23rd of May 1867. His autobiography, Some Account of my Li/e and Writings, edited by his daughter-in-law, Lady Alison, was published in 1883 at Edinburgh. Sir Archibald Alison married in 1825 Elizabeth Glencairn, daughter of Colonel Tytler, by whom he had three children, Archibald, Frederick and Eliza Frances Catherine. Both sons became distinguished officers.

SIR ARCHIBALD ALISON, Bart. (1826-1907), the elder of the sons, entered the 72nd Highlanders in 1846. He served at the siege of Sevastopol; and during the Indian Mutiny he was military secretary to Sir Colin Campbell and was severely wounded at the relief of Lucknow, losing an arm. From 1862 to 1873 he was assistant adjutant-general at headquarters, Portsmouth and Aldershot. He was second in command of the Ashanti expedition 1873-1874, and was made a K.C.B. For three years Alison was deputy adjutant-general in Ireland, and then, for a few months, commandant of the Staff College. He was promoted to be major-general in 1877, and was head of the intelligence branch of the war office (1878-1882). He commanded the troops at Alexandria in 1882 until the arrival of Sir Garnet Wolseley, led the Highland brigade at the battle of Tel-el-Kebir, and remained in command of the army of occupation until 1883. He commanded at Aldershot 1883-1888, was for some months adjutant-general to the forces during Lord Wolseley's absence in Egypt, was made G.C.B. in 1887, was promoted general, and became a military member of the Council of India in 1889. He retired in 1893 and died in 1907.

ALIWAL, a village of British India, in the Ludhiana district of the Punjab, situated on the left bank of the Sutlej, and famous as the scene of one of the great battles of the 1st Sikh War. Late in January 1846 it was held by Ranjur Singh, who had crossed the river in force and threatened Ludhiana. On the 28th Sir Harry Smith, with a view to clearing the left or British bank, attacked him, and after a desperate struggle thrice pierced the Sikh troops with his cavalry, and pushed them into the river, where large numbers perished, leaving 67 guns to the victors. The consequence of the victory was the submission of the whole territory east of the Sutlej to the British.

ALIWAL NORTH, a town of South Africa, on the south bank of the Orange River, 4300 ft. above the sea, and 282 m. by rail N.W. by N. of the port of East London. Pop. (1904) 5566, of whom 1758 were whites. The town, a trading and agricultural centre for the N.E. part of the Cape and the neighbouring regions of Basutoland and Orange Free State, presents a pleasing appearance. It contains many fine stone buildings. The streets are lined with trees, and water from the neighbouring sulphur springs flows along them in open channels. The river, here the boundary between the Cape province and Orange Free State, is crossed by a stone bridge 860 ft. long. The sulphur springs, 1 m. from the town, which yield over 500,000 gallons daily, are resorted to for the cure of rheumatism and skin diseases. By reason of its dry and bracing climate, Aliwal North is also a favourite residence of sufferers from chest complaints. In the neighbourhood are stone quarries. Aliwal North is the capital of a division of the province of the same name, with an area of 1330 sq. m. and a pop. (1904) of 14,857, of whom 40% are whites.

Aliwal North was so called to distinguish it from Aliwal South, now Mossel Bay, the seaport of the pastoral Grasveld district, on the west side of Mossel Bay. Both places were named in honour of Sir Harry Smith, governor of Cape Colony 1847-1852, Aliwal (see above) being the village in the Punjab where in 1846 he gained a great Victory over the Sikhs. Crossing the Orange River at this spot in September 1848, Sir Harry noted that it was ``a beautiful site for a town,'' and in the May following the town was founded. In the early months of the Boer War of 1899-1902 Aliwal North was held by the Boers. It was reoccupied by the British in March 1900.

ALIZARIN, or 1.2 DIOXYANTHRAQUINONE,

/CO\ C6H4 C6H2(OH)2[1.2], \CO/ a vegetable dyestuff formerly prepared from madder root (Rubia tinctorum) which contains a glucoside ruberythric acid (C26H28O14). This glucoside is readily hydrolysed by acids or ferments, breaking up into alizarin and glucose:

C26H28O14 + 2H2O = 2C6H12O6 + C14H8O4 Ruberythric acid = Glucose + Alizarin. Alizarin was known to the ancients, and until 1868 was obtained entirely from madder root. The first step in the synthetical production of alizarin was the discovery in 1868 of C. Graebe and C. Liebermann that on heating with zinc dust, alizarin was converted into anthracene. In order to synthesize alizarin, they converted anthracene into anthraquinone and then brominated the quinone. The dibrominated product so obtained was then fused with caustic potash, the melt dissolved in water, and on the addition of hydrochloric acid to the solution, alizarin was precipitated. This process, owing to its expensive nature, was not in use very long, being superseded by another, discovered simultaneously by the above-named chemists and by Sir W. H. Perkin; the method being to sulphonate anthraquinone, and then to convert the sulphonic acid into its sodium salt and fuse this with caustic soda.

In practice, the crude anthracene is purified by solution in the higher pyridine bases, after which treatment it is frequently sublimed. It is then oxidized to anthraquinone by means of sodium dichromate and sulphuric acid in leaden vats, steam heated so that the mixture can be brought to the boil. When oxidation is complete the crude anthraquinone is separated in filter presses and heated with an excess of commercial oil of vitriol to 120 deg. C., the various impurities present in the crude material being sulphonated and rendered soluble in water, whilst the anthraquinone is unaffected; it is then washed, to remove impurities, and dried. The anthraquinone so obtained is then heated for some hours at about 150-160 deg. C. with fuming sulphuric acid (containing about 40-50% SO3), and by this treatment is converted into anthraquinone-b-monosulphonic acid. The solution is poured into water and sodium carbonate is added to neutralize the excess of acid, when the sodium salt of the monosulphonic acid (known as silver salt) separates out This is filtered, washed, and then fused with caustic soda, when the sulpho-group is replaced by a hydroxyl group, and a second hydroxyl group is simultaneously formed; in order to render the formation of this second group easier, a little potassium chlorate or sodium nitrate is added to the reaction mixture. The melt is dissolved in water and the dyestuff is liberated from the sodium salt by hydrochloric or sulphuric acid, or is converted into the calcium salt by digestion with hot milk of lime, then filtered and the calcium salt decomposed by acid. The precipitated alizarin is then well washed and made into a paste with water, in which form it is put on to the market.

K. Lagodzinski (Berichte, 1895, 28, p. 1427) has synthesized alizarin by condensing hemipinic acid [(CH3O)2C6H2(COOH)2] with benzene in the presence of aluminium chloride. The product on acidification gives a compound C15H12O5.H2O which is probably an oxy-methoxy-benzoyl benzoic acid. This is dissolved in cold concentrated sulphuric acid, in which it forms a yellowish red solution, but on heating to 100 deg. C. the colour changes to red and violet, and on pouring out upon ice, the monomethyl ether of alizarin is precipitated. This compound is hydrolysed by hydriodic acid and alizarin is obtained. It can also be synthesized by heating catechol with phthalic anhydride and sulphuric acid at 150 deg. C.

/CO\ /CO\ C6H4 O + C6H4(OH)2[1.2] = H2O + C6H4 C6H2(OH)2. \CO/ \CO/

Pure alizarin crystallizes in red prisms melting at 200 deg. C. It is insoluble in water, and not very soluble in alcohol. It dissolves readily in caustic alkalis on account of its phenolic character, and it forms a yellow-coloured di-acetate. Its value as a dyestuff depends on its power of forming insoluble compounds (lakes) with metallic oxides. It has no affinity for vegetable fibres, and consequently cotton goods must be mordanted before dyeing with it (see DYEING.)

Numerous derivatives of alizarin are known. On solution in glacial acetic acid and addition of nitric acid, b-nitroalizarin

OH | (alizarin orange) / \ /CO\ / \OH | | | | \ / \CO/ \ /NO2

is produced, and this on heating with sulphuric acid and glycerin is converted into alizarin blue.

The trioxyanthraquinones--purpurin, anthrapurpurin, anthragallol and flavopurpurin---are also very valuable dyestuffs. These compounds may be represented by the following formulae:

OH OH OH OH | | | | / \ /CO\ / \OH HO/ \ /CO\ / \OH / \ /CO\ / \OH / \ /CO\ / \OH | | | | | | | | | | | | | | | | \ / \CO/ \ / \ / \CO/ \ / HO\ / \CO/ \ / \ / \CO/ \ /OH | OH

Purpurin. Anthrapurpurin. Flavopurpurin. Anthragallol.

Purpurin (1.2.4 trioxyanthraquinone) is found with alizarin in madder root; it is now prepared synthetically by oxidizing alizarin with manganese dioxide and sulphuric acid. After the separation of the silver salt (see above) obtained on sulphonating anthraquinone, the remaining acid liquid gives on treatment with calcium carbonate the calcium salt of anthraquinone 2.6 disulphonic acid (anthraquinone- a-disulphonic acid). This is converted into the sodium salt by means of sodium carbonate, and on alkali fusion yields fiavopurpurin. In a similar manner anthrapurpurin is prepared by alkali fusion of anthraquinone 2.8 disulphonic acid. Anthragallol is synthetically prepared by the condensation of benzoic and gallic acids with sulphuric acid

OH OH | | / \COOH / \OH / \ /CO\ / \OH | | + | | = 2 H2O + | | | | \ / HOOC\ /OH \ / \CO/ \ /OH

or from pyrogallol and phthalic anhydride in the presence of sulphuric acid or zinc chloride.

A. Baeyer in 1890, by heating alizarin with fuming sulphuric acid for 24-48 hours at 35-40 deg. C., obtained a product, which after treatment with caustic soda gave a sulphuric acid ester of quinalizarin, and this after acidification and boiling was converted into quinalizarin (Alizarin Bordeaux) or 1.2.6.9 tetra-oxyanthraquinone. Penta-oxyanthraquinones have been obtained from purpurin and anthrapurpurin, while a hexa- oxyanthraquinone has been obtained from 1.5 dinitro- anthraquinone.

ALKAHEST (a pseudo-Arabic word believed to have been invented by Paracelsus), a liquid, much sought after by the alchemists, having the power of dissolving gold and every other substance, which it was supposed would possess invaluable medicinal qualities.

ALKALI, an Arabic term originally applied to the ashes of plants, from which by lixiviation carbonate of soda was obtained in the case of sea-plants and carbonate of potash in that of land-plants. The method of making these ``mild'' alkalis into ``caustic'' alkalis by treatment with lime was practised in the time of Pliny in connexion with the manufacture of soap, and it was also known that the ashes of shore-plants yielded a hard soap and those of land-plants a soft one. But the two substances were generally confounded as ``fixed alkali'' (carbonate of ammonia being ``volatile alkali''), till Duhamel du Monceau in 1736 established the fact that common salt and the ashes of sea-plants contain the same base as is found in natural deposits of soda salts (``mineral alkali''), and that this body is different from the ``vegetable alkali'' obtained by incinerating land- plants or wood (pot-ashes). Later, Martin Heinrich Klaproth, finding vegetable alkali in certain minerals, such as leucite, proposed to distinguish it as potash, and at the same time assigned to the mineral alkali the name natron, which survives in the symbol, Na, now used for sodium. The word alkali supplied the symbol for potassium, K (kalium.) In modern chemistry alkali is a general term used for compounds which have the property of neutralizing acids, and is applied more particularly to the highly soluble hydrates of sodium and potassium and of the three rarer ``alkali metals,'' caesium, rubidium and lithium, also to aqueous ammonia. In a smaller degree these alkaline properties are shared by the less soluble hydrates of the ``metals of the alkaline earths,'' calcium, barium and strontium, and by thallium hydrate. An alkali is distinguished from an acid or neutral substance by its action on litmus, turmeric and other indicators.

ALKALI MANUFACTURE. The word ``alkali'' denotes both soda and potash, but by ``alkali manufacture'' we understand merely the manufacture of sodium sulphate, carbonate and hydrate. The corresponding potash compounds are not manufactured in the United Kingdom, but exclusively in Germany (from potassium chloride and from the mother-liquor of the strontia process in the manufacture of beetroot sugar) and in France (from vinasse) . The term alkali is employed in a technical sense for the carbonate and hydrate (of sodium), but since in the Leblanc process the manufacture of sodium sulphate necessarily precedes that of the carbonate, we include this as well as the manufacture of hydrochloric acid which is inseparable from it. We also treat of the utilization of hydrochloric acid for the manufacture of chlorine and its derivatives, which are usually comprised within the meaning of the term ``alkali manufacture.'' A great many processes have been proposed for the manufacture of alkali from various materials, but none of these has become of any practical importance except those which start from sodium chloride (common salt); and among the latter again only three classes of processes are actually employed for manufacturing purposes, viz. the Leblanc, the ammonia-soda, and the electrolytic processes.

I. THE LEBLANC PROCESS

The Leblanc process, which was invented by Nicolas Leblanc (q.v.) about 1790, begins with the decomposition of sodium chloride by sulphuric acid, by which sodium sulphate and hydrochloric acid are produced. The sodium sulphate is afterwards fluxed with calcium carbonate and coal, and a mixture is thus obtained from which sodium carbonate can be extracted by exhausting it with water.

Leblanc himself for a time carried out his process on a manufacturing scale, but he was ruined in the political troubles of the time and died by his own hand in 1806. His invention was, however, at once utilized by others in France; and in Great Britain, after a few previous attempts on a small scale, it was definitely introduced by James Muspratt (q.v.) in 1823. From that time onward the Leblanc process spread more and more, and for a considerable period nearly all the alkali of commerce was made by it. The rise of the ammonia-soda process (since 1870) gradually told upon the Leblanc process, which in consequence has been greatly restricted in Great Britain and Germany, and has become practically extinct in all other countries, except as far as its first part, the manufacture of sodium sulphate and hydrochloric acid, is concerned.

The production of alkali in Great Britain, soon after the introduction of the Leblanc process, became the most extensive in the world, and outstripped that of all other countries put together. With the rise of the ammonia-soda process, for which the economic conditions are nearly as favourable in other countries, the predominance of Great Britain in that domain has become less, but even now that country produces more alkali than any other single country. Most of the British alkali works are situated in South Lancashire and the adjoining part of Cheshire, near the mouth of the Tyne and in the West of Scotland.

Various industries are carried on in Leblanc alkali works, as follows:--

1. Manufacture of sodium sulphate.

2. Manufacture of hydrochloric acid.

3. Preparation of chlorine.

4. Employment of chlorine for the manufacture of bleaching- powder and of chlorates.

5. Manufacture of ordinary alkali from sulphate of soda.

6. Manufacture of caustic soda.

7. Manufacture of soda crystals.

8. Recovery of sulphur from alkali waste.

1. Manufacture of Sodium Sulphate.--This is commercially known as salt-cake, and is made by decomposing common salt with sulphuric acid of about 80%, the reaction being 2NaCl + H2SO4 = Na2SO4 + 2HCl. This reaction proceeds in two stages. At first principally acid sodium sulphate, NaHSO4, is formed together with some normal sulphate; later, when the temperature has risen, the NaHSO4 acts with more NaCl so that nearly all of it is converted into Na2SO4. The gaseous hydrochloric acid evolved during all this time must be absorbed in water, unless it is directly converted into chlorine (see below, 2 and 3).

The process is carried out either in hand-wrought furnaces, or mechanical furnaces, both called ``decomposing'' or ``salt-cake furnaces.'' In the former case, the first reaction is produced in cast- iron pans or ``pots,'' very heavy castings of circular section, fired from below, either directly or by the waste heat from the muffle- furnace. The reaction is completed in a ``roasting- furnace.'' The latter was formerly often constructed as a revereratory funace, which is easy to build and to work, but the hydrochloric acid given off here, being mixed with the products of the combustion of fuel, cannot be condensed to strong acid and is partly, if not entirely, wasted. It is, therefore, decidedly preferable to employ ``muffle-furnaces'' in which the heating is performed from without, the fire-gases passing first over the arch and then under the bottom of the muffle. This requires more time and fuel than the work in ``open'' furnaces, but in the muffles the gaseous hydrochloric acid is separated from the fire-gases, just like that evolved in the pot, and can therefore be condensed into strong hydrochloric acid, like the pot-acid. This roaster-acid is, however, of less value than the pot-acid, as it contains more impurities.

It is not easy to keep the muffles permanently tight, and as soon as any leakages occur, either hydrochloric acid must escape into the fire-flue, or some fire-gases must enter into the muffle. The former is decidedly more objectionable than the latter, as it means that uncondensed hydrochloric acid is sent into the air. This drawback has been overcome by the construction of ``plus-pressure'' furnaces (figs. 1 and 2), where the fire-grate is placed 11 ft. below the top of the muffle. In consequence the fire-gases, when arriving there by the chimney shaft (a), have already a good upward draught, and when circulatung round the muffle are at a lower pressure than the gases within the muffle, so that in case of any cracks being formed, no hydrochloric acid escapes into the fire-flues, but vice versa.

Since the work with ordinary hand-wrought salt-cake furnaces is disagreeable and costly, many attempts have been made to construct mechanical salt-cake furnaces. Of these J. Mactear's furnaces (fig. 3) have met with the greatest success. They consist of a horizontal pan, 17 ft. wide, which is made up of a central pan (e), and a series of concentric compartments (C1), (C2), (C3), and which is supported on a frame (d d), revolving round a perpendicular axis on the wheels (n n). It is with an arch and heated on the top from one side (l), either by an ordinary coal-grate or by a gas-producer. A set of stirring blades carried in the frame (b b), and driven by gearing,

FIGS. 1. and 2.--Salt-cake Furnace. (Sectional Elevation and Plan.) Scale

Figs. 1-9 from Lunge's Handbuch der Soda-Industrie, by permission of Friedr. Vieweg u. Sohn.

passes through a gap in the arch in such a manner that the gases cannot escape outwards. The salt is conveyed to the furnace by a chain of buckets running on the pulley (g), and passing into the hopper (h), and through the pipe (i) is mixed with the proper amount of acid supplied by the pipe ( f.) The mixture is fed in continuously to the central pan (e.) whence it overflows into the compartments (c1), (c2), (c3) successively until it reaches the circumference, where it is discharged continously by o and p into the collecting-box (q), being now converted into salt-cake. This furnace acts very well, and has been widely introduced both in Great Britain and in other countries, but it has one great drawback, apart from its high cost, viz. that all the hydrochloric acid gas gets mixed with fire-gases, and consequently is condensed in a weaker and less pure form than from ordinary pots and muffles. This has led some factories which had introduced such furnaces to revert to hand-wrought muffle-furnaces.

Much was expected at one time from the.``direct salt-cake process'' of Hargreaves and Robinson, in which common salt is subjected in a series of large cast-iron cylinders to the action of pyrites-burner gases and steam at a low red heat. The reaction going on here is: 2NaCl + SO2 + O + H2O = Na2SO4 + 2HCl. This means that the previous manufacture of sulphuric acid in the vitriol-chambers is done away with, but this apparently great simplification is balanced by the great cost of the Hargreaves plant, and by the fact that the whole of the hydrochloric acid is mixed with nine or ten times its volume of inert gases. Owing to this, it is practically impossible to condense the gaseous hydrochloric acid into the commercial acid, although this acid may be obtained sufficiently strong to be worked up in the Weldon chlorine process (see below, 3). Therefore the Hargreaves process has been introduced only in a few places.

Although the consumption of salt-cake for the manufacture of alkali is now much less than formerly, since the Leblanc alkali process has been greatly restricted, yet it is largely made and will continue to be made for the use of glassmakers, who use it for the ordinary description of glass in the place of soda-ash. Nor must it be overlooked that salt-cake must be made as long

FIG. 3.--Mechanical Salt-cake Furnace. (Sectional Elevation.) Scale

as there is a sale for hydrochloric acid, or a consumption of the latter for the manufacture of chlorine.

2. Manufacture of Hydrochloric Acid (commercially also known as ``muriatic acid''). This unavoidable gaseous bye-product of the manufacture of salt-cake was, during the first part of the 19th century, simply sent into the air. When its deleterious effects upon vegetation, building materials, &c., became better known, and when at the same time an outlet had been found for moderate quantities of hydrochloric acid, most factories made more or less successful attempts to ``condense'' the gas by absorption in water. But this was hardly anywhere done to the fullest possible extent, and in those districts where a number of alkali works were located at no great distance from one another, their aggregate escapes of hydrochloric and other acids created an intolerable nuisance. This was most notably the case in South Lancashire, and it led to the passing of Lord Derby's ``Alkali Act,'' in 1863, supplemented by further legislation in 1874, 1881 and later. There is hardly another example in the annals of legislative efforts equal to this, in respect of the real benefit conferred by it both on the general public and on the manufacturers themselves. This is principally the consequence of the exemplary way in which the duties of inspector under these acts were carried out by Dr R. Angus Smith (1817-1884) and his successors, who directed their efforts not merely to their primary duty of preventing nuisance, but quite as much to showing manufacturers how to make the most of the acid formerly wasted in one shape or another. Not merely Great Britain but all mankind has been immensely benefited by the labours of the British alkali inspectors, which were, of course, supplemented by the work of technical men in all the countries concerned. The scientific and technical principles of the condensation of hydrochloric acid are now thoroughly well understood, and it is possible to recover nearly the whole of it in the state of strong commercial acid, containing from 32 to 36% of pure hydrochloric acid, although probably the majority of the manufacturers are still content to obtain part of the acid in a weaker state, merely to satisfy the requirements of the law prescribing the prevention of nuisance. The principles of the condensation, that is of converting the gaseous hydrochloric acid given off during the decomposition of common salt into a strong solution of this gas in water, can be summarized in a few words. The hydrochloric acid gas, which is always diluted with air, sometimes to a very great extent, must be brought into the most intimate contact possible with water, which greedily absorbs it, forming ordinary hydrochloric acid, and this process must be carried so far that scarcely any hydrochloric acid remains in the escaping gases. The maximum escape allowed by thc Alkali Acts, viz. 5 % of the total hydrochloric acid, is far above that which is now practically attained. For a proper utilization of the condensed acid it is nearly always imperative that it should be as strong as possible, and this forms a second important consideration in the construction of the condensing apparatus. Since the solubility of hydrochloric acid in water decreases with the increase of the temperature, it is necessary to keep the latter down--a task which is rendered somewhat difficult both by the original heat retained by the gases on their escape from the decomposing apparatus, and by the heat given off through the reaction of hydrochloric acid upon water.

Very different methods have been employed to effect all the above purposes. In Great Britain Gay-Lussac's coke-towers, adapted by W. Gossage to the condensation of hydrochloric acid, are still nearly everywhere in use, frequently combined with a number of stone tanks through which the gas from the furnaces travels before entering the towers, meeting on its way the acid condensed in the tower. This process is excellent for effecting a complete condensation of the hydrochloric acid as prescribed by the Alkali Acts, and for recovering the bulk of the acid in a tolerably strong state, but less so for recovering nearly the whole of it in the most concentrated state, although even this is occasionally attained. On the continent of Europe, where the last-named requirement has been for a long time more urgent than in Great Britain, another system has been generally preferred, namely, passing the gas through a long series of stoneware receivers, and ultimately through a small tower packed with stoneware or coke, making the acid flow in the opposite direction to the gas. Great success has also been obtained by ``plate-towers'' made of stoneware, which allow both the coke-towers and most of the stoneware receivers to be dispensed with.

3. Preparation of Chlorine.--In this place we speak only of the preparation of chlorine from hydrochloric acid by chemical processes; the electrolytic processes will be treated hereafter. It is clear that free chlorine must be prepared from hydrochloric acid by oxidizing the hydrogen. This can be done most easily by ``active'' oxygen, such as is present in the peroxides, in chromic or permanganic acid. Practically the only agent employed in this way, and that already by C. W. Scheele, the discoverer of chlorine, in 1774, is the peroxide of manganese (manganese dioxide), found in considerable quantities in nature as ``manganese ore'' (the purest of which is called pyrolusite), and also artificially regenerated from the waste liquors of a former operation. Even now, where chlorine is required for immediate use in some other chemical operations on a comparatively small scale, it is obtained by the action of hydrochloric acid on native manganese dioxide, according to the equation: Mno2 + 4HCl = MnCl2 + Cl2 + 2H2O. This action must be promoted by heating the mixture, but even then nothing like all of the hydrochloric acid employed is made to act as above, because the attack on the manganese ore requires a certain minimum concentration of the acid. Formerly, instead of free hydrochloric acid a mixture of common salt and sulphuric acid was sometimes employed, but this is never done on a manufacturing scale now. Owing to the impossibility of employing any metal in contact with the acid, the ``chlorine stills,'' where the above reaction is carried out, must be made of acid-proof stones or ``chemical'' stoneware. This process is very costly, as much of the acid and all of the manganese is wasted. Moreover it is of a most disagreeable kind, as the waste ``still-liquor,'' containing very much free hydrochloric acid and even some free chlorine, forms a most deleterious impurity when finding its way into drains or water- courses, apart from the intolerable nuisance caused by the escapes of chlorine from the stills and otherwise, which cannot be at all times avoided.

Many endeavours were made to avoid the loss of the manganese in this operation, but with only partial or no success. The difficulty was only overcome by the Weldon process, being the inventions of Walter Weldon from 1866 onwards, and his process up to this day furnishes the greater proportion of chlorine manufactured in the world. It begins with ``still-liquor,'' obtained in the old way from native manganese ore and hydrochloric acid. This liquor is first treated with carbonate of lime (ground chalk or limestone) in a ``neutralizing-well,'' made of acid-proof material and provided with wooden stirring-gear. Here the free hydrochloric acid is converted into calcium chloride, and at the same time any ferric chloride present is converted into insoluble ferric hydroxide: 2FeCl3 + 3CaCO3 + 3 H2O = 2Fe(OH)3 + 3CaCl2 + 3CO2. The sulphuric acid present is mostly precipitated as calcium sulphate. The mud thus formed is settled out, and the clear liquor, which is now quite neutral and contains both manganese and calcium chlorides, is mixed with cream of lime and treated by a strong current of air, produced by a blowing-engine. This is done in a tall iron cylinder, say 9 ft. wide and 30 ft. high, called the ``oxidizer.'' The air-pipe goes right to the bottom of the cylinder and there branches out into perforated side-pipes, so that the mass is thoroughly stirred up all the time. The first action of the lime is to convert the manganese chloride into manganous hydrate (Mn(OH)2) and calcium chloride; then more lime is added which greatly promotes and hastens the oxidizing process. The object of the latter is to convert the manganous hydroxide by the atmospheric oxygen into manganese dioxide, but this would take place much too slowly if there was not an excess of lime present ready to combine with the manganese dioxide to form a calcium manganite. Only so much lime is used that an acid manganite is formed corresponding to one molecule of calcium oxide to two of manganous oxide. This additional lime, which is called the ``basis,'' certainly takes up hydrochloric acid in the next stage of the process, but that causes no more waste of acid than the incomplete action on native manganese ore, mentioned before. The product obtained, called ``Weldon mud,'' is of such fine texture that it acts immediately with hydrochloric acid when mixed with it in the ``Weldon stills'' (fig. 4), and that this acid can be almost entirely neutralized thereby. The new still liquor formed in this manner is treated as above, so that the manganese does its work over and over again. There is only a slight mechanical loss, which is reduced in the best managed works to about 2 parts of manganese dioxide to 100 of bleaching- powder. There are also other advantages of this process which explain its wide extension, in spite of the fact that only from 30 to 35 parts of the hydrochloric acid employed is converted into chlorine, the remainder ultimately leaving the factory in the shape of a harmless but useless solution of calcium chloride.

Weldon's later attempts at superseding his classical process by other inventions which utilize a larger proportion of the chlorine, introduced as hydrochloric acid, have not been successful in the long run, although some of them were aided by the great technical skill of A. R. Pechiney. But the Deacon process, the invention of Henry Deacon (who was greatly aided by his chemist Dr Ferdinand Hurter), carried out since 1868, has attained to better, although nothing like complete, success in that direction.

The Deacon process, like the Weldon process, effects its object by the oxidizing action of atmospheric air, but in a very different manner. Weldon retained the principle of the Scheele

FIG. 4.--Weldon Chlorine Still. (Sectional Elevation.) Scale

C, Stone steam column resting in stone socket K.

process by employing the active oxygen of manganese dioxide to convert hydrochloric acid into free chlorine, and he employed the atmospheric oxygen only indirectly, for the recovery of manganese dioxide from the manganese chloride formed. But Deacon worked on the direct reaction: 2HCl + O = H2O + Cl2. This reaction in ordinary circumstances is so slow as to be practically useless. If, however, a ``contact-substance'' is employed and that at the proper temperature, the process goes on at an immensely quickened rate and can even be carried out as a continuous operation. The only substance which possesses sufficiently strong catalytic properties for the reaction is cupric chloride. If pieces of porous clay are soaked in a solution of this salt and dried and kept at a temperature of 450 deg. C. (in practice it is necessary to go to a rather higher temperature), it is possible continuously to convert a united stream of hydrochloric acid and atmospheric air, passed through the contact- substance in a ``decomposer'' (fig. 5), to a larger extent into chlorine and water, of course mixed with the excess of oxygen and all the nitrogen of the air. On a small scale it is possible to push the decomposition as far as 90% of the hydrochloric acid, but on the large scale only at most 60% is reached. The mixture of hydrochloric acid and air is taken directly from the ``decomposing-pan'' of an ordinary salt-cake furnace, is first cooled down in pipes sufficiently to condense most of the moisture present (together with about 8% of the hydrochloric acid), and then passed through a cast-iron superheater and from this into the ``decomposer.'' The gaseous mixture, issuing from the latter, is washed with water in the usual condensing apparatus, to remove the 40 or 50 parts of hydrochloric acid left unchanged, and can then be immediately employed for the manufacture of chlorate of potash.

Where (as is the more usual case) the chlorine has to serve for the manufacture of bleaching-powder, it must first be deprived of the great amount of moisture which it contains, by means of

FIG. 5.--Deacon ``Decomposer.'' (Sectional Elevation.) Scale 1/40. a,a, Upright cast-iron cylinders; b,b, brick jacket; c,c, flues; d,e, iron plates arranged like venetian blinds, between which the contact-substance is contained; f, charging hole; g, discharging hole; h, entrance pipe for gas; i, exit pipe for gas.

coke-towers fed with moderately strong sulphuric acid. As the gas issuing from these contains only about 5 volumes % of hydrochloric acid, it cannot be made to act upon lime in the ordinary bleaching-powder chambers, but specially constructed chambers must be provided (see fig. 4). The movement of the gases through all this complicated set of apparatus is produced by a Root's blower placed at the end of it all.

The Deacon process makes cheaper chlorine than the Weldon process, but the plant is complicated and costly and the working requires a great deal of attention. In skilled hands it has been proved to yield excellent results.

The hydrochloric acid from the calcining-furnaces or ``roasters'' cannot be employed immediately for the Deacon process, as the sulphuric acid always contained in the roaster gases soon ``poisons'' the contact-substance and renders it inoperative. This acid must, therefore, be condensed in the ordinary way into liquid hydrochloric acid and formerly could be worked up only by the Weldon process. R. Hasenclever has overcome this drawback by running this impure acid into moderately strong sulphuric acid (140 deg. Twaddell), blowing in air at the same time. This produces a mixed current of pure hydrochloric acid gas and air, which is carried into a Deacon decomposer where it acts in the usual manner. The sulphuric acid, of which 6 or 7 parts are used to one of impure liquid hydrochloric acid, is always reserved for use in the same process, by driving off the excess of water in a lead pan, fired from the top, so that the principal expense of the process is that of the fuel required for the last operation.

4. Applications of Chlorine.--Some of the chlorine manufactured (practically only such as is obtained by the electrolysis of chlorides) is condensed by cold and pressure into liquid chlorine. If this is anhydrous, as it must be in any case for this purpose, it does not act upon the metal of the compressors, nor upon the iron bottles in which it is sent out. It may even be sent out in tank wagons, similar to those which are employed for carrying sulphuric acid, holding 10 tons each.

Sometimes the chlorine is employed directly for bleaching purposes, especially for some kinds of paper. A number of organic chlorinated products are also produced on a large scale. But most of the chlorine is utilized for the production of bleaching- powder, of bleach-liquor, and of chlorate of potash.

Bleaching-powder is a compound obtained by the action of free chlorine on hydrated lime, containing a slight excess of water at ordinary temperatures or slightly above these. Its composition approaches the formula CaOCl2, and it is regarded as a double salt of calcium chloride and hypochlorite, which by the action of water splits up into a mixture of these salts. It always contains a certain quantity of chemically combined water and also an excess of lime. Usually this lime is regarded only as mechanically mixed with the bleaching-compound, CaOCl2, but some chemists adopt formulae in which this lime is equally represented.

For the manufacture of bleaching-powder, limestone of high degree of purity (especially free from magnesia and iron) is carefully burned so as to drive out nearly all the carbon dioxide without overheating the lime. The quick-lime is then slaked with the requisite quantity of water; the product is passed through a fine-meshed wire sieve and is spread in layers of 2 or 3 in. at the bottom of large boxes, the ``bleaching-powder chambers,'' made of lead, or sometimes of cast-iron protected by paint, of slate or even of tarred wood. Chlorine, generated in an ordinary or a Weldon still, is passed in and is rapidly absorbed. When the absorption becomes slow, the gas is cut off and the chamber is left to itself for twelve hours or more, when it will be found that all the chlorine has been taken up. Now the door of the chamber is opened, the powder lying at the bottom is turned over and the treatment with gas is repeated. Sometimes a third treatment is necessary in order to get the product up to the strength required in commerce, viz. 35% of ``available'' chlorine. The finished product is packed into wooden casks lined with brown paper. The work of packing is a most disagreeable and unhealthy operation which is best relieved by erecting the chambers at a higher level and placing the casks underneath, communication being made by means of traps in the chamber-bottom. so that the packers can do their work outside the chambers. The bleaching-powder casks must be kept in a dry place, as cool as possible, and never exposed to the direct rays of the sun, in order to prevent a decomposition which now and then has even led to explosions.

The weak chlorine from the Deacon process cannot be treated in this manner, as chambers of impossibly large dimensions would be required. Originally the absorption of the Deacon chlorine took place in a set of chambers, constructed of large slabs of stone, containing a great many horizontal shelves superposed over one another. About sixteen such chambers were combined in such manner that the fresh gas passed into that chamber which had been the longest time at work and in which the bleaching-powder was nearly finished, and so forth until the gas, now all but entirely exhausted, reached the last-filled chamber in which it met with fresh lime and there gave up the last of the chlorine. These ``Deacon chambers'' occupied a large space, besides being expensive to build and difficult to keep in repair.

They are now mostly replaced by an apparatus, the invention of R. Hasenclever, consisting of four horizontal cast-iron cylinders with internal stirring-gear. The fresh lime is continually charged into the top cylinder, is gradually moved towards the other end, falls down into the next lower cylinder and thus gradually makes its way to the lowest cylinder. The weak chlorine gas from the Deacon apparatus travels precisely the opposite way, from the bottom upwards, the result being that finished bleaching- powder is continually discharged at the bottom and air free from chlorine leaves the apparatus at the top.

Bleaching-powder is manufactured to the extent of several hundred thousands of tons annually, almost entirely for the use of papermakers and cotton bleachers. Smaller quantities are used for disinfection and other purposes. It is usually sold in ``tierces,'' that is, casks containing about 10 cwt.

Bleach-liquors.--If the chlorine is made to act on cream of lime, care being taken that the temperature does not rise above 35 deg. and that the chlorine is not in excess, a solution is obtained containing a mixture of calcium chloride and hypochlorite which is a very convenient agent for bleachers, but which does not bear the expense of carriage over long distances. Similar liquids are obtained with a basis of sodium (``eau de Javel''), by passing chlorine into solutions of sodium carbonate. The former kind of bleach-liquor is mostly used in the industry of cotton, the latter in that of linen.

Chlorate of Potash.--Formerly all chlorate of potash, as some is still, was obtained by passing chlorine into milk of lime, allowing the temperature to rise almost to the boiling-point, and continuing until the bleaching-solution, originally formed, is converted into a mixture of calcium chlorate and chloride, the final reaction being 6Ca(OH)2 + 6Cl2 = 5Cacl2 + Ca(ClO3)2 + 6H2O. On adding to this solution, after settling out the mud, a quantity of potassium chloride equivalent to the calcium chlorate, the reaction Ca(ClO3)2 + 2KCl = CaCl2 + 2KClO3 is produced, the ultimate proportions thus being theoretically 2KClO3 to 6CaCl2, though in reality there is rather more calcium chloride present. When this solution is concentrated by evaporation and cooled down, about five-sixths of the chlorate of potash crystallizes out. It is purified by redissolving and crystallization, and is sold either in the state of crystals or finely ground. During these operations care must be taken lest a spark should produce the inflammation of the chlorate on contact with any organic substance. Large quantities of potassium chlorate exposed to strong heat in contact with the wood of casks or the timber of a roof have produced violent explosions.

Most of the chlorate of potash is now prepared by electrolysis of potassium chloride (see below). It is employed for fire-works, for some descriptions of explosives, for safety matches and as an oxidizer in some operations, especially in dyeing and tissue printing. For the last-named purpose it is sometimes replaced by sodium chlorate. The chlorates are usually sold in wooden kegs containing 1 cwt. each.

5. The Manufacture of Soda-ash from Salt-cake by the Leblanc process.--This process consists in heating a mixture of commercial

FIG. 6.--Black-ash Furnace and Boiling-down Pan. Scale

[14051]

sulphate of soda (salt-cake) with about the same weight of crushed limestone and half its weight of coal, until the materials are fluxed and a reaction has taken place, the principal phase of which is expressed by the equation Na2SO4 + CaC03 + 2C = 2CO2 + Na2CO3 + CaS. A number of secondary reactions, however, occur, owing partly to the excess of calcium carbonate and coal and partly to the impurities present, so that the solid product of the process, which is called ``black-ash,'' has a somewhat complicated composition. Its principal constituents are always sodium carbonate and calcium sulphide, which are separated by the action of water, the former being soluble and the latter insoluble.

The furnace in which the reaction takes place is shown in fig. 6 in a sectional plan. It is called a ``black-ash'' furnace, and belongs to the class of reverberatory furnaces. A large fire-grate (ab), having a cave (c) to facilitate stoking and stepped back at (d), is bounded on one side by a fire-bridge (e); on the other side of this, separated by an air-channel (g), there is first the proper fluxing bed (h), and behind this the ``back-bed'' (i) for pre-heating the charge. The flame issuing from the furnace by (o) is always further utilized for boiling down the liquors obtained in a later stage, either in a pan (p) fired from the top and supported on pillars (qq) as shown in the drawing, or in pans heated from below. The charge of salt-cake (generally 3 cwt.), limestone and coal is roughly mixed and put upon the back-bed; when the front- bed has become empty it is drawn forward and exposed to the full heat of the fire, with frequent stirring. After about three- quarters of an hour the substances are so far fluxed or softened that the reaction now sets in fully, as shown by the copious escape of gas. This is at first colourless carbon dioxide, but later on inflammable gases come out of the mass, which at this stage has turned into a thicker, pasty condition, showing that the end of the reaction is near. The inflammable gas is carbon monoxide, which, however, does not burn with its proper purple flame, but with a flame tinged bright yellow by the sodium present. This carbon monoxide is formed by the action of coal on the lime formed at this stage from the original limestone. When the ``candles'' of carbon monoxide appear, the pasty mass is quickly drawn out of the furnace into iron ``bogies,'' where it solidifies into a grey, porous mass, the ``black-ash.'' Care must be taken to heat it no longer than necessary, as it otherwise turns red and yields bad soda.

The hand-wrought black-ash furnace has been mostly superseded in the large factories by the revolving black-ash furnace, shown in fig. 7. These furnaces possess a large cylindrical shell (e), lined with fire-bricks, and made to revolve round its horizontal axis by means of a toothed wheel fixed on its exterior; (ff) are tire-seats holding tires (gg), which work in friction rollers (h). The flame of a fixed fireplace (a) enters through an ``eye'' (b) in the centre of the front end of the cylinder and issues in the centre of

FIG. 7.--Revolving Black-ash Furnace. (Elevation.) Scale

the back end, first into a large dust-chamber (m.) and then over or under boiling-down pans (p.) These mechanical furnaces do the work of from four to ten ordinary furnaces according to their size. with comparatively very little expense for labour, but they must be very carefully managed and the black-ash from them is more difficult to lixiviate than that from hand-wrought furnaces, because it is less porous. The lixiviation of the black- ash requires great care, as the calcium sulphide is liable to be changed into soluble calcium compounds, which immediately react with sodium carbonate and destroy a corresponding quantity of the latter, rendering the soda weaker and impure. This change of the calcium sulphide may be brought about either by the oxidizing action of the air or by ``hydrolysis,'' produced by prolonged contact with hot water, the use of which, on the other hand, cannot be avoided in order to extract the sodium carbonate itself. The apparatus which has been found most suitable for the purpose was devised by Professor H. Buff of Giessen, and first practically carried out by Charles Dunlop at St Rollox. It consists of a number of tanks or ``vats,'' placed at the same level and connected by pipes which reach nearly to the bottom of one tank and open out at the top into the next tank. The vats are also provided with false bottoms, outlet cocks, steam pipes and so forth. Tepid water is run in at one end of the series, where nearly exhausted black-ash is present; the weak liquor takes up more soda from the intermediate tanks and at last gets up to full strength in the last tank, charged with fresh black-ash and kept at a higher temperature, viz. 60 deg. C. When the first tank has been quite exhausted, the water is turned on to the next, the first tank is emptied by discharging the ``alkali- waste,'' and is filled with fresh black-ash, whereupon it becomes the last of the series. In spite of all precautions a certain quantity of impurities is always formed, but this should be kept down as much as possible by strictly watching the temperature in the vats and by taking care that the black-ash in the wet state is never exposed to the air. The unavoidable contamination with muddy particles of vat-waste is removed by allowing the vat- liquor to rest for some hours in a separate tank and settling out the mud.

The clear vat-liquor, if allowed to cool down to ordinary temperature, would separate out part of the sodium carbonate in the shape of decahydrated crystals. As these do not come out sufficiently pure, they would not be marketable and therefore they are not allowed to be formed, but the liquid, while still hot, is either run into the boiling-down pans, or submitted to one of the purifying operations to be described below. If it is boiled down without further purification, the resulting soda-ash is not of the first quality, but it is sufficiently pure for many purposes. The boiling down is most economically performed by means of large iron pans covered with a brick arch and heated from the top by the waste flame issuing from the black-ash furnaces (see figs. 6 and 7). It is continued until the contents of the pan have been converted into a thick paste of small crystals of monohydrated sodium carbonate, permeated by a mother-liquor which is removed by draining on perforated plates or by a centrifugal machine, and is always returned to the pans. The drained crystals are dried and heated to redness in a reverberatory furnace; when ``finished,'' the mass is of an impure white or light yellow colour and is sold as ordinary ``soda-ash.'' It is not easy to make it stronger than 92% of sodium carbonate, which is technically expressed as ``52 degrees of available soda'' (see next page). If purer and stronger soda-ash is wanted, the boiling down must be carried out in pans fired from below, and the crystals of monohydrated sodium carbonate ``fished'' out as they are formed, but this is mostly done after submitting the liquor to the purifying operations which we shall now describe.

The dried or ``finished'' soda-ash is ground to a pretty fine powder and is packed into wooden casks or ``tierces,'' holding from 10 to about 20 cwt. each, according to the way of filling them.

The principal impurities of crude vat-liquor are sodium hydrate and sulphide, the latter of which always leads to the formation of soluble double sulphur salts of sodium and iron. The other impurities are of minor importance. The sulphides can be removed by ``oxidizing'' them into thiosulphates by means of atmospheric air, with or without the assistance of other agents, such as manganese peroxide; or by ``carbonating'' them with lime-kiln or other gases containing carbon dioxide; or by precipitating them with lead or zinc oxide. The last mentioned is the best but costliest method, and is employed only in the manufacture of the highest strengths of caustic soda. The most usual process, where soda-ash is to be made, is the ``carbonating.'' This is usually effected either by forcing lime-kiln gas through the liquor, contained in a closed iron vessel, or by passing the gases through an iron tower filled with coke or other materials, suitable for subdividing the stream of the gases and that of the vat-liquor which trickles down in the tower. The same apparatus is used for ``oxidizing'' by means of atmospheric air passed through by means of an injector; sometimes both air and carbon dioxide are passed in at the same time. The operation is finished when all the sodium sulphide has been converted into normal sodium carbonate, partly also into acid sodium carbonate (bicarbonate) NaHCO3; at the same time a precipitate is formed, consisting of ferrous sulphide, alumina and silica, which is removed by another settling tank, and the clear liquor is now ready either for boiling down in a ``fishing-pan'' for the manufacture of white soda-ash, or for the process of causticizing.

Soda-ash (as well as caustic soda) is sold by degrees of ``available soda.'' This means that portion which neutralizes the acid employed for testing, and the degrees mean the percentage of Na2O thus found, whether it be present as Na2CO3, NaOH, or sodium aluminate or silicate. The purest soda-ash, equal to 100% Na2CO3, would be 58 1/2 degrees of available soda. The ordinary commercial strength of Leblanc soda-ash is from 52 to 54 degrees (in former times much was sold in the state of 48%).

6. Manufacture of Caustic Soda.--Most of the Leblanc liquor is nowadays converted into caustic soda, as white soda-ash is more easily and cheaply made by the ammonia-soda process. We shall therefore in this place describe the manufacture of caustic soda. This is always made from the carbonate by the action of slaked lime: Na2CO3 + Ca(OH)2 = CaCO3 + 2NaOH. The calcium carbonate, being insoluble, is easily separated from the caustic liquor by filtration. But as this reaction is reversible, we must observe the conditions necessary for directing it in the right sense. These are: diluting with water so as not to exceed 10% of sodium carbonate to 90% of water; boiling this mixture; and keeping it well agitated. At the best about 92% of the sodium carbonate can be converted into caustic soda, 8% remaining unchanged.

The operation is performed in iron cylinders, provided with an agitating arrangement. This may consist of a steam injector by means of which air is made to bubble through the liquid, which produces both the required agitation and the heating, and at the same time oxidizes at least part of the sulphides; but this method of agitation causes a great waste of steam and at the same time a further dilution of the liquor. Many, therefore, prefer mechanical stirring by means of paddles, fixed either to a vertical or to a horizontal shaft, and inject only sufficient steam to keep the mass at the proper temperature. Some heat is also gained by the slaking of the caustic lime within the liquor. After from half an hour to a whole hour the conversion of sodium carbonate into sodium hydrate is brought about as far as is practicable. The whole mass is now run into the filters, which are always constructed on the vacuum principle. They are iron boxes, in which a bed is made of bricks, above them gravel, and over this sand, covered on the top by iron grids. The space below the sieve thus formed is connected by means of an outlet tap with a closed tank, and this again communicates with a vacuum pump. By this means the filtration is quickened by the atmospheric pressure, and goes on very rapidly, as also does the subsequent washing. The filtered caustic liquor passes to the concentration plants; the washings are employed for diluting fresh vat-liquor for the next operation, or for dissolving solid soda-ash for the same purpose. The washed-out calcium carbonate, which always contains much calcium hydrate and 2 or 3% of soda in various forms, usually goes back to the black-ash furnaces, but it cannot be always used up in this way, and what remains is thrown upon a heap outside the works. Attempts have been made to use it in the manufacture of Portland cement, but without much success.

The clear caustic soda liquor must be concentrated in such a way that the caustic soda cannot to any great extent be reconverted into sodium carbonate, and that the ``salts'' which it contains, sodium carbonate, sulphate, chloride, &c., can be. separated during the process. Formerly the most usual concentrating apparatus was the ``boat-pan'' (fig. 8). This is an

FIG. 8.--Caustic Soda Concentration Boat-pan. (Sectional Elevation.) Scale

oblong iron pan, the bottom of which slopes from both sides to a narrow channel. The latter rests on a brick pillar; the remaining part of the sloping bottom is heated, either by the waste fire from a black-ash furnace or by a special fireplace. This arrangement has the effect that the salts, as they separate out, slide down the sloping part and arrive in the central channel, which is not exposed to the fire-gases, so that they quietly settle there, without caking to the pan, until they are fished out by means of perforated ladles. These boat-pans were for many years almost everywhere employed, and did their work quite well, but rather expensively. At many works they have been replaced by either Thelen pans or vacuum pans.

The ``Thelen pan'' (thus named from its inventor, a foreman at the Rhenania works near Aachen) is a mechanically worked fishing-pan, which requires considerably less labour and coal than ordinary boat-pans. It is a long trough, of nearly semicircular section, the whole bottom being exposed to the fire- gases. A horizontal shaft runs length-ways through the trough, and is provided with stirring blades, arranged in such a manner that they constantly scrape the bottom, so that the salts cannot burn fast upon it, and are at the same time moved forward towards one of the ends of the trough where they are automatically removed by means of a chain of buckets.

The most efficient evaporating apparatus, as far as economy of fuel is concerned, is the vacuum-pan, of which from two to five are combined to form a set, but it has the drawback that the removal of the salts is much more difficult than with the older pans, described above. In this apparatus only the first of the pans is heated directly, usually by means of ordinary boiler- steam circulating round a number of pipes, containing the liquid to be concentrated. The steam rising from the latter is passed into a similar pan, in which it circulates round another set of pipes, but as it could not bring the liquid in the latter to boil under ordinary conditions, the second pan is connected with a vacuum-pump so that the boiling-point of the liquid in this pan is lowered. This pan may be followed by a third pan, in which a stronger vacuum is maintained, and so forth. By this means the latent heat of the steam, issuing from all pans but the last, is utilized for evaporating purposes, and from half to three-fourths of the fuel is saved.

After being concentrated up to a certain point, and after the separation of nearly all the salts, the caustic liquor is transferred to cast-iron ``finishing-pots'' (fig. 9), holding from ten to twenty tons. Here it is further boiled down until the greater part or nearly all of the water has been removed, and until the salts on cooling would set to a solid mass. This requires ultimately a good red heat. Before the mass has reached that point the sulphides still present have been destroyed, either by the addition of solid nitrate of soda or by blowing air through the red-hot melt. Before finishing, the molten mass must be kept at a quiet

FIG. 9.--Caustic Soda ``Finishing-pot.'' (Sectional Elevation.) Scale

heat for some hours in order to settle out the ferric oxide which it always contains, and which becomes insoluble (through the destruction of the sodium ferrite) only at high temperatures. When it has completely cleared, the liquid caustic is ladled or pumped out into sheet-iron drums, holding about 6 cwt. each, where it solidifies and forms the caustic soda known to commerce.

The best caustic soda tests from 75 to 76 degrees of ``available soda''; this is only a few per cent removed from the composition of pure NaOH, which would be = 77.5 degrees Na2O. Most of the caustic soda is sold at a strength of 70 degrees, sometimes as low as 60 degrees.

Caustic soda is used in very large quantities in the manufacture of soap, paper, textile fabrics, alizarin and other colouring matters, and for many other purposes.

7. Soda-Crystals.--Another product made in alkali works is soda-crystals. Their formula in Na2CO3, 10H2O, corresponding to 37% of dry sodium carbonate. They are made by dissolving ordinary soda-ash in hot water, adding a small quantity of chloride of lime for the destruction of colouring matter and the oxidation of any ferrous salts present, carefully settling the solution, without allowing its temperature to fall below the point of maximum solubility (34 deg. C.), and running the clarified liquid into cast-iron crystallizers or ``cones,'' where, on cooling down, most of the sodium carbonate is separated in large crystals of the decahydrated form. This process lasts about a week in winter, and up to a fortnight in summer. In France the crystallization of soda is performed not in large tanks but in sheet-iron dishes holding only about 1/4 cwt., and requires only from 27 to 48 hours in the cool season; it is not carried on at all in warmer climates during the summer months. The mother-liquor, drained from the soda-crystals, on boiling down to dryness yields a very white, but low-strength soda-ash, as the soluble impurities of the original soda-ash are nearly all collected here; it is called ``mother-alkali.''

Although the soda-crystals contain the alkali combined with such a large quantity of water, they are made in large quantities, because their form, together with their complete freedom from caustic soda, makes them very suitable for domestic purposes. Hence they are best known as ``washing-soda.'' Sometimes they are made, not from soda-ash, but from Leblanc soda-liquor before ``finishing'' the ash, or from the crude bicarbonate of the ammonia-soda process by prolonged boiling, until nearly half of the carbonic acid has been expelled.

Formerly bicarbonate of soda was made from Leblanc soda- crystals by the action of carbonic acid, but this article is now almost exclusively made in the ammonia-soda process.

8. The Recovery of Sulphur from Alkali-waste.--For many years all the sulphur used in the Leblanc process in the shape of sodium sulphate, and originally imported into the manufacture in the shape of brimstone or pyrites, was wasted in the crude calcium sulphide remaining from the lixiviation of black-ash. This ``alkali-waste,'' also called tank-waste or vat- waste, was thrown into heaps where the calcium sulphide was gradually acted upon by the moisture and the oxygen of the air. The sulphur was by these converted partly into gaseous sulphuretted hydrogen, partly into soluble polysulphides, thiosulphates and other soluble compounds, and in all shapes caused a nuisance which became more and more intolerable as the number and size of alkali works increased. Both the air and the water in their neighbourhood were contaminated thereby.

Both this nuisance and the loss of the sulphur (whose cost sometimes amounted to more than half of the total cost of the soda-ash) led to many attempts at extracting the sulphur from the alkali-waste. This was first done with a certain amount of success by the processes of M. Schaffner (1861) and L. Mond (1862), but as these required the use of hydrochloric acid, and as they only recovered about half of the sulphur, they were superseded by another--a process which had been originally proposed by W. Gossage in 1837, but has been made practicable only by the inventions of C. F. Claus, in 1883, and from 1887 onward by the technical skill of Messrs Chance Brothers, of Oldbury. The Claus-Chance process, as it is called, comprises the following operations. The wet alkali-waste as it comes from the lixiviating vats, is transferred into upright iron cylinders in which it is systematically treated with lime-kiln gases until the whole of the calcium sulphide has been converted into calcium carbonate, the carbon dioxide of the lime-kiln gases being entirely exhausted. The sulphur issues as sulphuretted hydrogen, mixed with the nitrogen of the air. It is mixed with fresh air containing sufficient oxygen for the combustion of the hydrogen, and the mixture is passed through red-hot iron oxide (burnt pyrites) which by its catalytic action causes the reaction H2S + O = H2O + S to take place. By cooling the vapours the sulphur is condensed in a very pure form, and about 85% of the whole of it is recovered, the remaining 15% escaping in the shape of sulphur dioxide (SO2) and H2S. Unfortunately it has been hitherto found impossible to deal with these gases in any profitable way.

It should be noted that this ``recovered sulphur,'' which is equal in purity to the ``refined brimstone'' of commerce, has a far higher value than the sulphur contained in the originally employed pyrites, so that the recovery is a paying process, in spite of the somewhat considerable cost of the plant and of the working operations. It has been introduced at most large Leblanc alkali works, and has, so to say, given them a new lease of life.

II. THE AMMONIA-SODA PROCESS

In spite of the great improvements effected during recent times the Leblanc process cannot economically compete with the ammonia-soda process, principally for two reasons. The sodium in the latter costs next to nothing, being obtained from natural or artificial brine in which the sodium chloride possesses an extremely slight value. The fuel required is less than half the amount used in the Leblanc process. Moreover, the ammonia process has been gradually elaborated into a very complicated but perfectly regularly working scheme, in which the cost of labour and the loss of ammonia are reduced to a minimum. The only way in which the Leblanc process could still hold its own was by being turned in the direction of making caustic soda, to which it lends itself more easily than the ammonia-soda process; but the latter has invaded even this field. One advantage, however, still remained to the Leblanc process. All endeavours to obtain either hydrochloric acid or free chlorine in the ammonia- soda process have proved commercial failures, all the chlorine of the sodium chloride being ultimately lost in the shape of worthless calcium chloride. The Leblanc process thus remained the sole purveyor of chlorine in its active forms, and in this way the fact is accounted for that, at least in Great Britain, the Leblanc process still furnishes nearly half of all the alkali made, though in other countries its proportional share is very much less. The profit made upon the chlorine produced has to make up for the loss on the alkali.

The ammonia-soda process was first patented in 1838 by H. G. Dyar and J. Hemming, who carried it out on an experimental scale in Whitechapel. Many attempts were soon after made in the same direction, both in England and on the continent of Europe, the most remarkable of which was the ingenious combination of apparatus devised by J. J. T. Schloesing and E. Rolland. But a really economical solution of the problem was first definitely found in 1872 by Ernest Solvay, as the result of investigations begun about ten years previously. The greater portion of all the soda-ash of commerce is now made by Solvay's apparatus, which alone we shall describe in this place, although it should be borne in mind that the principles laid down by Dyar and Hemming have been and are still successfully carried out in a number of factories by an entirely different kind of apparatus.

The leading reaction of this process is the mutual decomposition of ammonium bicarbonate and sodium chloride: NaCl + NH4HCO3 = NaHCO3 + NH4Cl. It begins, however, not with ready-made ammonium bicarbonate, but with the substances from which it is formed--ammonia, water and carbon dioxide--which are made to act on sodium chloride. In practice the process is carried out as follows. A nearly saturated solution of sodium chloride is obtained by purifying natural or artificial brine, i.e. an impure solution of common salt, especially removing the alkaline earths and so forth by addition of sodium or ammonium carbonate and settling out the precipitate formed. This solution is saturated with ammonia, produced in the recovery plant (see below), in vessels provided with mechanical agitators and strongly cooled by coils of pipes through which cold water is made to flow. These vessels, as well as all others which are used in the process, are not open to the air, but communicate with it through washers in which fresh salt solution is employed for retaining any escaping vapours of ammonia. The ammoniacal salt solution is now saturated with carbon dioxide. This is employed in the shape of lime-kiln gases, obtained in a comparatively pure and strong form (up to 33% CO2), in very large kilns, charged with limestone and coke. The kilns are closed at the top, and the gases are drawn out by powerful air-pumps, washers being interposed between the kilns and the pumps for the purpose of purifying and cooling the gas. The heat evolved by the compression in the air-pumps (which rises to four atmospheres or upwards) is again removed by cooling, and the gas is now passed upwards in the ``Solvay tower'' (fig. 10). This is a tall iron erection, built up from superposed cylinders, which are separated from one another by perforated horizontal diaphragms, constructed in such a way that the gases are over and over again subdivided into many smaller streams and are thus thoroughly brought into contact with the ammoniacal salt solution with which the tower is about two-thirds filled. There the reaction mentioned above takes place, and owing to the concentration of the liquid the sodium bicarbonate formed is to a great extent precipitated in the shape of small crystals, forming with the mother-liquor a thin magma. This takes place with considerable evolution of heat which is removed by internal and external cooling with water. The temperature must not be allowed to rise beyond a certain point, for the reaction NaCl + NH4HCO3 = NaHCO3 + NH4Cl is reversible, and at a temperature of about 60 deg. or 70 deg. C. it is in fact practically going the wrong way, viz. from right to left. On the other hand the cooling must not be carried too far, for in this case the crystals of sodium bicarbonate become so fine that the muddy mass is very difficult to filter. The best temperature seems to be about 30 deg. C.

Either at certain intervals, or continuously, a portion of the contents of the tower is withdrawn and fresh ammoniacal salt solution is introduced higher up. The muddy liquid running out is passed on to the vacuum filters (Z, fig. 10). Here a separation takes place between the crystals of sodium bicarbonate and the mother-liquor. The former are washed with water until the chlorides are nearly removed, and are then carried into the drying apparatus.

From Thorpe's Dictionary of Applied Chemistry, by permission of Longmans, Green & Co.

FIG. 10.--Ammonia - soda Carbonating Towers and Filters. (Sectional Elevation.) Scale 1/100. AA, Tower; B, ammoniacal brine main; E, gas-inlet; Z, vacuum filter; V, pipe to air-pump.

This must be constructed in such a manner that the bicarbonate, which always contains some ammonium salts, is first freed from these by moderate heating (of course taking care that the ammonia is completely recovered), and later on, by raising the temperature, it is decomposed into solid sodium carbonate and gaseous carbon dioxide. The former needs only grinding to constitute the final product, ammonia- soda ash; the latter is again employed in the process of treating the ammoniacal salt solution with carbon dioxide. Various forms of apparatus are employed for this treatment of the crude bicarbonate--sometimes semi-circular troughs with mechanical agitators on the principle of the Thelen pan (see above)--all acting on the principle that the escaping ammonia and carbon dioxide must be fully utilized over again. The soda-ash obtained in the end is of a high degree of purity, testing from 98 to 99% Na2CO3, the remaining 1 or 2% consisting principally of NaCl.

A very important part of the process has still to be described, viz. the recovery of the ammonia from the mother-liquor coming from the vacuum filters and various washing liquors. Unless this recovery is carried out in the most efficient manner, the process cannot possibly pay; but so much progress has been made in this direction that the loss of ammonia is very slight indeed, merely a fraction per cent. The ammonia is for the major part found in the mother-liquor as ammonium chloride. A smaller but still considerable portion exists here and in the washings in the shape of ammonium carbonates. These compounds differ in their behaviour to heat. The ammonium carbonates are driven out from their solutions by mere prolonged boiling, being thereby decomposed into ammonia, carbon dioxide and water, but the ammonium chloride is not volatile under these conditions, and must be decomposed by milk of lime: 2NH4Cl + Ca(OH)2 = 2NH3 + CaCl2 + 2H2O. The solution of calcium chloride is run to waste, the ammonia is re-introduced into the process.

Both these reactions are carried out in tall cylindrical columns or ``stills,'' Consisting of a number of superposed cylinders, having perforated horizontal partitions, and provided with a steam-heating arrangement in the enlarged bottom portion. The milk of lime is introduced at a certain distance from the bottom. The steam causes the action of the lime on the ammonium chloride to take place in this lower portion of the still, from which the steam, mixed with all the liberated ammonia, rises into the upper portion of the column where its heat serves to drive out the volatile ammonium carbonate. Just below the top there is a cooling arrangement, so that nearly all the water is condensed and runs back into the column, while the ammonia, with the carbon dioxide formerly combined with part of it, passes on first through an outside cooler where the remaining water is condensed, and afterwards into the vessels, already described, where the ammonia is absorbed by a solution of salt and thus again introduced into the process.

The reversible character of the principal reaction has the consequence that a considerable portion of the sodium chloride (up to 33%) is lost, being contained in the waste calcium chloride solution which issues from the ammonia stills. This is, however, not of much importance, as it had been introduced in the shape of a brine where its value is very slight (6d. per ton of NaCl). It is true that all the chlorine combined with the sodium is lost partly as NaCl and partly as CaCl2; none of the innumerable attempts at recovering the chlorine from the waste liquor has been made to pay, and success is less likely than ever since the perfection of the electrolytic processes. (See CHLORINE.) For all that, especially in consequence of the small amount of fuel required, and the total absence of the necessity of employing sulphur compounds as an intermediary, the ammonia-soda process has supplanted the Leblanc process almost entirely on the continent of Europe and to a great extent in Great Britain.

III. ELECTROLITIC ALKALI MANUFACTURE

In theory by far the simplest process for making alkalis together with free chlorine is the electrolysis of sodium (or potassium) chloride. When this takes place in an aqueous solution, the alkaline metal at once reacts with the water, so that a solution of an alkaline hydrate is formed while hydrogen escapes. The reactions are therefore (we shall in this case speak only of the sodium compounds): (1) NaCl = Na + Cl, (2) Na + H2O = NaOH + H.

The chlorine escapes at the anode, the hydrogen at the cathode. If the chlorine and the sodiun hydrate can act upon each other within the liquid, bleach-liquors are formed: 2NaOH + Cl2 = NaOCl + NaOH + H2O. The production of these for the use of papermakers and bleachers of textile fabrics has become an important industry, but does not enter into our province.

If, however, the action of the chlorine on the sodium hydrate is prevented, which can be done in various ways, they can both be collected in the isolated state and utilized as has been previously described, viz. the chlorine can be used for the manufacture of liquid chlorine, bleaching-powder or other bleaching compounds, or chlorates, and the solution of sodium hydrate can be sold as such, or converted into solid caustic soda. Precisely the same can be done in the electrolysis of potassium chloride.

There is a third way of conducting the action, viz. so that the chlorine can act upon the caustic soda or potash at a higher concentration and temperature, in which case chlorates are directly formed in the liquid: KCl + 8H2O = KClO3 + 8H2. This has indeed become the principal, because it is the cheapest, process for the manufacture of potassium and sodium chlorate. Perchlorates can also be made in this way.

In all these cases the chlorine, or the products made from it, really play a greater part than the alkali. From 58.5 parts by weight of NaCl we obtain theoretically 23Na = 40NaOH = 53Na2CO3, together with 35.5 Cl, or 100 bleaching-powder. As the weight of bleaching-powder consumed in the world is at most one-fifth of that of alkali, calculated as Na2CO3, it follows that only about one-tenth of all the alkali required could be made by electrolysis, even supposing the Leblanc process to be entirely abolished. The remaining nine-tenths of alkali must be supplied from other sources, chiefly the ammonia-soda process. As long as the operation of the Leblanc process is continued, it will supply a certain share of both kinds of products. Trustworthy statistics on this point cannot be obtained, because most firms withhold any information as to the extent of their production from the public.

The first patents for the electrolysis of alkaline chlorides were taken out in 1851 and several others later on; but commercial success was utterly impossible until the invention of the dynamo machine allowed the production of the electric current at a sufficiently cheap rate. The first application of this machine for the present purpose seems to have been made in 1875 and the number of patents soon rapidly increased; but although a large amount of capital was invested and many very ingenious inventions made their appearance, it took nearly another twenty years before the manufacture of alkali in this way was carried out in a continuous way on a large scale and with profitable results. A little earlier the manufacture of potassium chlorate (on the large scale since 1890) had been brought to a definite success by H. Gall and the Vicomte A. de Montlaur; a few years later the processes worked out at the Griesheim alkali works (near Frankfort) for the manufacture of caustic potash and chlorine established definitely the success of electrolysis in the field of potash, but even then none of the various processes working with sodium chloride had emerged from the experimental stage. Only more recently the manufacture of caustic soda by electrolysis has also been established as a permanent and paying industry, but as the greatest secrecy is maintained in everything belonging to this domain, and as neither patent specifications nor the sanguine assertions and anticipations of interested persons throw much real light on the actual facts of the case, nothing certain can be said either in regard to the date at which the profitable manufacture of caustic soda was first carried out by electrolysis, or as to what extent this is the case at the present moment.

We shall here give merely an outline of those more important processes which are known to be at present working profitably on a large scale.

(1) The Diaphragm process is probably the only one employed at present for the decomposition of potassium chloride, and it is also used for sodium chloride. A hot, concentrated solution of the alkaline chloride is treated by the electric current in large iron tanks which at the same time serve as cathodes. The anodes are made of retort-carbon or other chlorine-resisting material, and they are mounted in cells which serve as diaphragms. The material of these cells is usually cement, mixed with certain soluble salts which impart sufficient porosity to the material. The electrolysis is carried on until about a quarter of the chloride has been transformed; it must be stopped at this stage lest the formation of hypochlorite and chlorate should set in. The alkaline liquid is now transferred to vacuum pans, constructed in such a manner that the unchanged chloride, which ``salts out'' during the concentration, can be removed without disturbing the vacuum, and here at last a concentrated pure solution of KOH or NaOH is obtained which is sold in this state, or ``finished'' as solid caustic in the manner described in the section treating of the Leblanc soda.

(2) The Castner-Kellner process employs no diaphragm, but a mercurial cathode. The electrolysis takes place in the central compartment of a tripartite trough which can be made to rock slightly either to one side or the other. The bottom of the trough is covered with mercury. The sodium as it is formed at the cathode at once dissolves in the mercury which protects it against the action of the water as long as the percentage of sodium in the mercury does not exceed, say, 0.02%. When this percentage has been reached, the cell is rocked to the other side, so that the amalgam flows into one of the outer compartments where the sodium is converted by water into sodium hydrate. At the same time fresh mercury, from which the sodium had been previously extracted, flows from the other outside compartment into the central one. After a certain time the whole is rocked towards the other side, and the process is continued until the outer compartments contain a strong solution of caustic soda, free from chloride and hypochlorite.

(3) Aussig process.--Here the anode is fixed in a bell, mounted in a larger iron tank where the cathodes are placed. The whole is filled with a solution of common salt. As the electrolysis goes on, NaOH is formed at the cathodes and remains at the bottom. The intermediate layer of the salt solution, floating over the caustic soda solution, plays the part of a diaphragm, by preventing the chlorine evolved in the bell from acting on the sodium hydrate formed outside, and this solution offers much less resistance to the electric current than the ordinary diaphragms. This process therefore consumes less power than most others.

(4) The Acker-Douglas process electrolyses sodium chloride in the molten state, employing a cathode consisting of molten lead. The latter dissolves the sodium as it is formed and carries it to an outer compartment where by the action of water the sodium is converted into caustic soda, while the lead returns to the inner compartment. This process is carried on at Niagara Falls, but it is uncertain to what extent.

(5) The Hargreaves-Bird process avoids certain drawbacks attached to other processes, by employing a wire diaphragm and converting the caustic soda as it issues on the other side of this, by means of carbon dioxide, into a mixture of sodium carbonate and bicarbonate, which separates out in the solid state. This process is but little used.

It stands to reason that the electrolytic processes have been principally developed in localities where the electric current can be produced in the cheapest possible manner by means of water power, but this is not the only condition to be considered, as the question of freight to a centre of consumption and other circumstances may also play an important part. Where coal is very cheap indeed and the other conditions are favourable, it is possible to establish such an industry with a prospect of commercial success, even when the electric current is produced by means of steam-engines.

Natural Soda.--This is the term applied to certain deposits of alkaline salts, or their solutions, which occur, sometimes in very large quantities, in various parts of the world. The oldest and best known of these are the Natron lakes in Lower Egypt. The largest occurrence of natural soda hitherto known is that in Owen's Lake and other salt lakes situated in eastern California. The soda in all of these is present as ``sesquicarbonate,'' in reality 4/3 carbonate: NaHCO3.Na2CO3.2H2O, and is always mixed with large quantities of chloride and sulphate, which makes its extraction more difficult than would appear from the outset. Hence, although for many centuries (up to Leblanc's invention) hardly any soda was available except from this source, and although we now know that millions of tons of it exist, especially in the west of the United States, there is as yet very little of it practically employed, and that only locally.

REFERENCES.--The principal work on the manufacture of alkali is G. Lunge's Sulphuric Acid anid Alkali (2nd ed., vols. ii. and iii., 1895-1896). This work has also appeared in a German and a French edition. The same author wrote the articles on the manufacture of sodium and potassium compounds and on chlorine in Thorpe's Dictionary of applied Chemistry (3 vols., 1890-1893). The subject is also treated, very much more briefly, in Sorel's Industrie chimique minerale (1902), and of course in every other general treatise on chemical technology. A special treatise on the manufaciure of ammonia soda ash has been published in German by H. Schreib. Consult also the official Annual reports on Alkali, &c., and, from 1864 onwards, Journal of the Society of Chemical Industry, Fischers Jahresberichte der chemischen Technologie, and Zeitschrift fur angewandte Chemie. (G. L.)

ALKALINE EARTHS. The so-called alkaline earth-metals are the elements beryllium, magnesium, calcium, strontium and barium. By the early chemists, the term earth was used to denote those non-metallic substances which were insoluble in water and were unaffected by strong heating; and as some of these substances (e.g. lime) were found to be very similar in properties to those of the alkalis, they were called alkaline earths. The alkaline earths were assumed to be elements until 1807, when Sir H. Davy showed that they were oxides of various metals. The metals comprising this group are never found in the uncombined condition, but occur most often in the form of carbonates and sulphates; they form oxides of the type RO, and in the case of calcium, strontium and barium, of the type RO2. The oxides of type RO are soluble in water, the solution possessing a strongly alkaline reaction and rapidly absorbing carbon dioxide on exposure; they are basic in character and dissolve readily in acids with the formation of the corresponding salts. As the atomic weight of the element increases, it is found that the solubility of the sulphates in water decreases.

Beryllium to a certain extent stands alone in many of its chemical properties, resembling to some extent the metal aluminium. Beryllium and magnesium are permanent in dry air; calcium, strontium and barium, however, oxidize rapidly on exposure. The salts of all the metals of this group usually crystallize well, the chlorides and nitrates dissolve readily in water, whilst the carbonates, phosphates and sulphates are either very sparingly soluble or are insoluble in water.

ALKALOID, in chemistry, a term originally applied to any organic base, i.e. a nitrogenous substance which forms salts with acids; now, however, it is usual to restrict the term to bases of vegetable origin and characterized by remarkable toxicological effects. Such bases occur almost exclusively in the dicotyledons, generally in combination with malic, citric, tartaric or similar plant-acids. They may be extracted by exhausting the plant-tissues with a dilute acid, and precipitating the bases with potash, soda, lime or magnesia. The separation of the mixed bases so obtained is effected by repeated fractional crystallization, or by taking advantage of certain properties of the constituents.

A chemical classification of alkaloids is difficult on account of their complex constitution. I. A. Wyschnegradsky, and afterwards W. Konigs, expressed the opinion that the alkaloids were derivatives of pyridine or quinoline. This view has been fairly well supported by later discoveries; but, in addition to pyridine and quinoline nuclei, alkaloids derived from isoquinoline are known. The purely chemical literature on the alkaloids is especially voluminous; and from the assiduity with which the constitutions of these substances have been and are still being attacked, we may conclude that their synthesis is but a question of time. Piperine, conine, atropine, belladonine, cocaine, hyoscyamine and nicotine have been already synthesized; the constitution of several others requires confirmation, while there remain many important alkaloids--quinine, morphine, strychnine, &c.--whose constitution remains unknown.

The following classification is simple and convenient; the list of alkaloids makes no pretence at being exhaustive.

(1) Pyridine group. Piperine; conine; trigonelline; arecaidine; guvacine; pilocarpine; cytisine; nicotine; sparteine. (2) Tropine group. Alkaloids characterized by containing the tropine (q.v.) nucleus. Atropine; cocaine; hygrine; ecgonine; pelletierine. (3) Quinoline group. The alkaloids of the quina-barks: quinine, &c.; the strychnos bases: strychnine, brucine; and the veratrum alkaloids: veratrine, cevadine, &c. (4) Isoquinoline group. The opium alkaloids: morphine, codeine, thebaine, papaverine, narcotine, narceine, &c.; and the complicated substances hydrastine and berberine. In addition to the above series there are a considerable number of compounds derived from purin which are by some writers classed with the alkaloids. These are treated in the article PURIN. There are also reasons for including such compounds as muscarine, choline, neurine and betaine in this group.

The greater number of these substances are of considerable medicinal value; this aspect is treated generally in the article PHARMACOLOGY. Reference should also be made to the articles on the individual alkaloids for further details as to their medicinal and chemical properties.

The chemistry of the alkaloids is treated in detail by Ame Pictet in his La Constitution chimique des alcatoides vegetaux (Paris, 1897); enlarged and translated by H. C. Biddle wiih the title The Vegetable Alkaloids (New Vork, 1904); and by J. W. Bruhl, F. HJelt, and O. Aschan: Die Pflanzen-Alkaloide (1900). A pamphlet, Die Alkaloidchemie in den Jahren 1900-1904, by Julius Schmidt, may also be consulted.

ALKAN, CHARLES HENRI VALENTIN MORHANGE (1813-1888), French musical composer, was born and died in Paris. Alkan was his nom de guerre. Admitted to the Conservatoire of Paris in his sixth year, he had a distinguished career there until 1830. He visited London in 1833, after which he settled in Paris as a pianoforte teacher till his death. He is important as the composer of a large number of pianoforte etudes, embodying the most extravagant technical difficulties. His invention was not modern enough to secure for these works that attention which they deserve as representing a pianoforte technique and sense of effect in some respects more advanced even than that of Liszt, though lacking Liszt's economy and tact.

ALKANET (dim. from Span. alcana, Arab. al-hena = henna, Egyptian privet, or Lawsonia inermis), a plant, Alkanna or Anchusa tinctoria, of the order Boraginaceae, also known as orchanet, dyer's bugloss, Spanish bugloss or bugloss of Languedoc, which is grown in the south of France and on the shores of the Levant. Its root yields a fine red colouring matter which has been used to tint tinctures, oils, wines, varnishes, &c.

AL KASR AL KEBIR (``the great castle,'' in Span. ALCAZAR KEBIR, in Port. ALCACER QUBIR), a town of Morocco, on the river Lekkus, 80 m. N.W. of Fez. Pop. about 10,000. Its mud and pantile dwellings are here and there relieved by a mosque tower, but the aspect of the town is far from inviting. It is frequently flooded in winter and in consequence fever is prevalent. The weekly market, held on Sundays in the centre of the town, gives to the place an appearance of bustle. A vice-governor is appointed for the town by the basha of Laraiche, one for the country round by the sultan of Morocco, a condition which causes much confusion on market-days. Al Kasr al Rebir was built, according to Leo Africanus, by Yakub el Mansur (1186-1199). Not far from the town, by the banks of the river Makhazan, is the site of the battle fought in 1578 between Dom Sebastian, king of Portugal, and the Moors under Abd el Malek, in which the Moors were victorious, though both kings perished, as well as the deposed Mahommed XI., who had called in the Portuguese to his aid against Abd el Malek.

ALKMAAR, a town in the province of North Holland, kingdom of Holland, 24 1/2 m. by rail N.N.W. of Amsterdam, connected by steam-tramway with Haarlem and Amsterdam, and on the North Holland canal. Pop. (1900) 18,373. Alkmaar is a typical North Holland town, with tree-lined canals and brightly coloured 17th-century houses. The old city walls have been replaced by pleasant gardens and walks, and there is a park in which stands a fine monument (1876) by J. T. Stracke (1817- 1891), symbolizing Alcmaria victrix, to commemorate the siege by the Spaniards in 1573. The Groote Kerk (1470-1498), dedicated to St Lawrence, is a handsome building and contains the tomb of Floris V., count of Holland (d. 1296), a brass of 1546, and some paintings (1507). In the town hall (1507) are the library and a small museum with two pictures by the 17th century artist Caesar van Everdingen, who with his more celebrated brother Allart van Everdingen (q.v.) was a native of the town. The weigh-house (1582) is a picturesque building with quaint gable and tower. Just outside the town lies the Alkmaar wood, at the entrance to which stands the military cadet school which serves as a preparatory school for the royal military academy at Breda. Alkmaar derives its chief importance from being the centre of the flourishing butter and cheese trade of this region of Holland. It is also a considerable market for horses, cattle and grain, and there is a little boat-building and salt and sail-cloth manufacture. Tramways connect Alkmaar with Egmond and with the pretty summer resort of Bergen, which lies sheltered by woods and dunes.

The name of Alkmaar, which means ``all sea,'' first occurs in the 10th century, and recalls its former situation in the midst of marshlands and lakes. It was probably originally a fishing-village, but with the reclamation of the surrounding morasses, e.g. that of the Schermer in 1685, and their conversion into rich meadow land, Alkmaar gradually acquired an imporiant trade. In 1254 it received a charter from William II., count of Holland, similar to that of Haarlem, but in the 15in century duke Philip the Good of Burgundy made the impoverishment of the town, due to ill-government, the excuse for establishing an oligarchical regime, by charters of 1436 and 1437. As the capital of the ancient district of Kennemerland between den Helder and Haarlem, Alkmaar frequently suffered in the early wars between the Hollanders and the Frisians, and in 1517 was captured by the united Gelderlaiiders and Frisians. In 1573 it successfully sustained a seven-weeks' siege by 16,000 Spaniards under the duke of Alva. In 1799 Alkmaar gave its name to a conxention signed by the duke of York and the French general Brune, in accordance with which the Russo-British army of 23,000 men, which was defeated at Bergen, evacuated Holland. A monument was erected in 1901 to commemorate the Russians who fell.

ALLACCI, LEONE [LEO ALLATIUS] (1586-1669), Greek scholar and theologian, was born in the island or Chios. His early years were passed in Calabria and at Rome, where he finally settled as teacher of Greek at the Greek college, at the same time devoting himself to the study of classics and theology. In 1622, after the capture of Heidelberg by Tilly, the elector Maximilian of Bavaria presented its splendid library composed of 196 cases of MSS. (bibliotheca Palatina) to Pope Gregory XV. Allacci was sent to superintend its removal to Rome, where it was incorporated with the Vatican library. On the death of Gregory, Allacci became librarian to Cardinal Berberini, and subsequently (1661) librarian of the Vatican, which post he held till his death on the 18th (or 19th) of January 1669. It is noteworthy that, although a Greek by birth, he became an ardent Roman Catholic and the bitter enemy of all heretics, including his own countrymen. Allacci was a very industrious and voluminous writer, but his works, although they bear ample testimony to his immense learning, show an absence of the true critical faculty, and are full of intolerance, especially on religious subjects. For a list of these, J. A. Fabricius's Bibliotheca Graeca (xi. 437) should be consulted, where they are divided into four classes: editions, translations and commentaries on ancient authors; works relating to the dogmas and institutions of the Greek and Roman Churches; historical works; miscellaneous works. The number of his unpublished writings is also very large; the majority of them are included in the MSS. of the Vallicellian library.

The main source of our knowledge of Allatius is the incomplete life by Stephanus Gradi, Leonis Allatii vita, published by Cardinal Mai, in Nova Bibliotheca Patrum. A complete enumeration of his works is contained in E. Legrand, Bibliographie hellenique du XVIIeme siecle (Paris, 1895, iii. 435-471). The accounts of C. N. Sathas in Neoellenvike filologia (Athens, 1868), and of the pseudo-prince Demetrius Rhodokanakis, Leonis Allatii Hellas (Athens, 1872, are inaccurate and untrustworthy. For a special account of his share in the foundation of the Vatican Library, see Curzio Mazzi, Leone Allacci e la Palatina di Heidelberg (Bologna, 1893). The theological aspect of his works is best treated by the Assumptionist Father L. Petit in A. Vacant's Dictionnaire de theologie (Paris, 1900, cols. 830-833).

ALLAH, the Arabic name used by Moslems of all nationalities for the one true God. It is compounded of al, the definite article, and ilah, meaning a god. The same word is found in Hebrew and Aramaic as well as in ancient Arabic (Sabaean). The meaning of the root from which it is derived is very doubtful; cf. Lane's Arabic-English Lexicon, p. 82, and the Oxford Hebrew and English Lexicon, pp. 61 ff.

ALLAHABAD, a city of British India, the capital of the United Provinces of Agra and Oudh, giving its name to a district and a division. The city is situated at the confluence of the Ganges and the Jumna in 25 deg. 26' N. lat. and 81 deg. 50' E. long., 564 m. from Calcutta by rail. Its most conspicuous feature is the fort, which rises directly from the banks of the confluent rivers and completely commands the navigation of both streams. Within the fort are the remains of a splendid palace, erected by the Emperor Akbar, and once a favourite residence of his. A great portion of it has been destroyed, and its hall is converted into an arsenal. Outside the fort the places of most importance are the sarai and gardens of Khasru, the son of the Emperor Jehangir, and the Jama Masjid or Great Mosque. When the town first came into the hands of the English this mosque was used as a residence by the military officer commanding the station, and afterwards as an assembly room. Ultimately it was returned to its former owners, but the Mahommedans considered it desecrated, and it has never since been used as a place of worship. Allahabad (Illahabad) was the name given to the city when Akbar built the great fort. To the Hindus it is still known by its ancient name of Prag or Prayag (``place of sacrifice''), and it remains one of the most noted resorts of Hindu pilgrimage. It owes its sanctity to its being the reputed confluence of three sacred streams--the Ganges, the Jumna and the Saraswati. This last stream, however, actually loses itself in the sands of Sirhind, 400 m. north-west of Allahabad. The Hindus assert that the stream joins the other two rivers underground, and in a subterraneous temple below the fort a little moisture trickling from the rocky walls is pointed out as the waters of the Saraswati. An annual fair is held at Allahabad at the confluence of the streams on the occasion of the great bathing festival at the full moon of the Hindu month of Magh. It is known as the Magh-mela, lasts for a whole month, and is attended by as many as 250,000 persons in ordinary years, either for religious or commercial purposes. Every twelfth year there is a special occasion called the Kumbh-mela, which is attended by a million of devotees at one time. Allahabad was taken by the British in 1765 from the wazir of Oudh, and assigned as a residence to Shah Alam, the titular emperor of Delhi. Upon that prince throwing himself into the hands of the Mahrattas, the place was resumed by the British in 1771 and again transferred to the nawab of Oudh, by whom it was finally ceded together with the district to the British in 1801, in commutation of the subsidy which the wazir had agreed to pay for British protection. During the Mutiny of 1857, Allahabad became the scene of one of the most serious outbreaks and massacres which occurred in the North-Western Provinces. The fort was held by a little garrison of Europeans and loyal Sikhs, until it was relieved by General Neill on June 11th of that year.

The modern buildings of Allahabad include Government House, the High Court, the Mayo memorial and town hall, the Muir central college, the Thornhill and Mayne memorial library and museum, the Naini central jail, and the Anglican and Roman Catholic cathedrals. The Jumna is crossed by a railway bridge and there are two bridges of boats over the Ganges. The military cantonments contain accommodation for all three arms and are the headquarters of a brigade in the 8th division of the eastern army corps. At Allahabad is published the Pioneer, perhaps the best known English paper in India. There is an American mission college. Here is the junction of the great railway system which unites Bengal with Central India and Bombay, and is developing into a great centre of 1nland and export trade. The population in 1901 was 172,032.

The DISTRICT OF ALLAHABAD has an area of 2811 sq. m. In shape it is an irregular oblong, and it is very difficult to define its boundaries, as at one extremity it wanders into Oudh, while on the south the villages of the state of Rewa and those of this district are hopelessly intermingled. The Jumna and the Ganges enclose within their angle a fertile tract well irrigated with tanks and wells. The East Indian railway and the Grand Trunk road afford the principal means of land communication. In 1901 the population was 1,489,358, showing a decrease of 4% in the decade due to famine.

The division of Allahabad has an area of 17,270 sq. m. The population in 1901 was 5,540,702, showing a decrease of 4% in the decade due to the famine of 1896-1897, which was severely felt throughout the division. It comprises the seven districts of Cawnpore, Fatehpur, Banda, Hamirpur, Allahabad, Jhansi and Jalaun.

ALLAMANDA, named after J. N. S. Allamand (1713-1787), of Leiden, a genus of shrubby, evergreen climbers, belonging to the natural order Apocynaceae, and a native of tropical America. Several species are grown in hot-houses for the beauty of their folliage and flowers; the latter, borne in many-flowered panicles, have a funnel-shaped corolla with a narrow tube, and often yellow in colour. The plants are of comparatively easy culture, and very effective when trained to wires beneath the roof of the house.

ALLAN, DAVID (1744-1796), Scottish historical painter, was born at Alloa. On leaving Foulis's academy of painting at Glasgow (1762), after seven years' successful study, he obtained the patronage of Lord Cathcart and of Erskine of Mar, on whose estate he had been born. The latter furnished him with the means of proceeding to Rome (1764), where he remained for a number of years engaged principally in copying the old masters. Among the original works which he then painted was the ``Origin of Portraiture''--representing a Corinthian maid drawing her lover's shadow--well known through Domenico Cunego's excellent engraving. This gained for him the gold medal given by the Academy of St Luke in the year 1773 for the best specimen of historical composition. Returning from Rome in 1777, he resided for a time in London, and occupied himself in portrait-painting. In 1780 he removed to Edinburgh, where, on the death of Alexander Runciman in 1786, he was appointed director and master of the Academy of Arts. There he painted and etched in aquatint a variety of works, those by which he is best known--as the ``Scotch Wedding,'' the ``Highland Dance,'' the ``Repentance Stool,'' and his ``Illustrations of the Gentle Shepherd''--being remarkable for their comic humour. He was called the ``Scottish Hogarth''; but his drolleries hardly entitle him to this comparison. Allan died at Edinburgh on the 6th of August 1796.

ALLAN, SIR HUGH (1810-1882), Canadian financier, was born on the 29th of September 1810, at Saltcoats, Ayrshire, Scotland, the son of Captain Alexander Allan, a shipmaster. He emigrated to Canada in 1826, and in 1831 entered the employ of the chief shipbuilding and grain-shipping firm of Montreal, of which he became a junior partner in 1835. In 1853 he organized the Allan Line of steamships, plying between Montreal. Liverpool and Glasgow; till his death he was closely associated with the commercial growth and prosperity of Canada, and in 1871 was knighted in recognition of his services. In 1872- 1873 he obtained from the Canadian government a charter for building the Canadian Pacific railway, but the disclosures made with reference to his contributions to the funds of the Conservative party led to the Pacific scandal (see CANADA, History), and that company was soon afterwards dissolved. He died in Edinburgh on the 9th of December 1882.

See J. C. Dent, Canadian Portrait Gallery (1881).

ALLAN, SIR WILLIAM (1782-1850), Scottish painter, was born at Edinburgh, and at an early age entered as a pupil in the School of Design established in Edinburgh by the Board of Trustees for Arts and Manufactures, where he had as companions, John Wilkie, John Burnet the engraver, and others who afterward distinguished themselves as artists. Here Allan and Wilkie were placed at the same table, studied the same designs, and contracted a lifelong friendship. Allan continued his studies for some time in London; but his attempt to establish himself there was unsuccessful, and after exhibiting at the Royal Academy (1805) his first picture, ``A Gipsy Boy and Ass,'' an imitation in style of Opie, he determined, in spite of his scanty resources, to seek his fortune abroad. He accordingly set out the same year for Russia, but was carried by stress of weather to Memel, where he remained for some time, supporting himself by his pencil. At last, however, he reached St Petersburg, where the kindness of Sir Alexander Crichton, the court physician, and other friends procured him abundant employment. By excursions into southern Russia, Turkey, the Crimea and Circassia, he filled his portfolio with vivid sketches, of which he made admirable use in his subsequent pictures. In 1814 he returned to Edinburgh, and in the two following years exhibited at the Royal Academy ``The Circassian Captives'' and ``Bashkirs tonducting Convicts to Siberia.'' The former picture remained so long unsold, that, thoroughly disheartened, he threatened to retire to Circassia when, through the kindness of Sir Walter Scott, a subscription of 1000 guineas was obtained for the picture, which fell by lot into the possession of the earl of Wemyss. About the same time the Grand Duke Nicholas, afterwards tsar of Russia, visited Edinburgh, and purchased his ``Siberian Exiles'' and ``Haslan Gheray crossing the River Kuban,'' giving a very favourable turn to the fortunes of the painter, whose pictures were now sought for by collectors. From this time to 1834 he achieved his greatest success and firmly established his fame by the illustration of Scottish history. His most important works of this class were ``Archbishop Sharpe on Magus Moor''; ``John Knox admonishing Mary Queen of Scots'' (1823), engraved by Burnet; ``Mary Queen of Scots signing her Abdication'' (1824); and ``Regent Murray shot by Hamilton of Bothwellhaugh.'' The last procured his election as an associate of the Royal Academy (1825). Later Scottish subjects were ``Lord Byron'' (1831), portraits of Scott and ``The Orphan'' (1834), which represented Anne Scott seated near the chair of her deceased father. In 1830 he was compelled, on account of an attack of ophthalmia, to seek a milder climate, and visited Rome, Naples and Constantinople. He returned with a rich store of materials, of which he made excellent use in his ``Constantinople Slave Market'' and other productions. In 1834 he visited Spain and Morocco, and in 1841 went again to St Petersburg, when he undertook, at the request of the tsar, his ``Peter the Great teaching his Subjects the Art of Shipbuilding,'' exhibited in London in 1845, and now in the Winter Palace of St Petersburg. His ``Polish Exiles'' and ``Moorish Love-letter,'' &c., had secured his election as a Royal Academician in 1835; he was appointed president of the Royal Scottish Academy (1838), and royal limner for Scotland, after Wilkie's death (1841); and in 1842 received the honour of knighthood. His later years were occupied with battle-pieces, the last he finished being the second of his two companion pictures of the ``Battle of Waterloo.'' He died on the 22nd of February 1850, leaving a large unfinished picture--``Bruce at Bannockburn.''

ALHAN-DESPREAUX, LOUISE ROSALIE (1810-1856), French actress, was ``discovered'' by Talma at Brussels in 1820, when she played Joas with him in Athalie. At his suggestion she changed her surname, Ross, for her mother's maiden name, and, as Mlle. Despreaux, was engaged for children's parts at the Comedie Francaise. At the same time she studied at the Conservatoire. By 1825 she had taken the second prize for comedy, and was engaged to play inigenue parts at the Comeedie Francaise, where her first appearance in this capacity was as Jenny in L'Argent on the 8th of December 1826. In 1831 the director of the Gymnase succeeded in persuading her to join his company. Her six years at this theatre, during which she married Allan, an actor in the company, were a succession of triumphs. She was then engaged at the French theatre at St Petersburg. Returning to Paris, she brought with her, as Legouve says, a thing she had unearthed, through a Russian translation, a little comedy never acted till she took it up, a production half-forgotten, and esteemed by those who knew it as a pleasing piece of work in the Marivaux style--Un Caprice by Alfred de Musset, which she had played with success in St Petersburg. Her selection of this piece for her reappearance at the Theatre Francaise (1847) laid the corner-stone of Musset's lasting fame as a dramatist. In the following year his comedy Il ne faut jurer de rien was acted at the same theatre, and thus led to the production of his finer plays. Among plays by other authors in which Mme. Allan won special laurels at the Theatre Francaise. were Par droit de conquete, Peril en la demeure, La joie fait peur, and Lady Tartuffe. In the last, with a part of only fifty lines, and playing by the very side of the great Rachel, she yet held her own as an actress of the first rank. Mme. Allan died in Paris, in the height of her popularity, in March 1856.

/NH-CH-NH-CO-NH2 ALLANTOIN, C4H6N4O3 or CO | \NH-CO the diureide of glyoxylic acid. It is found in the allantoic liquid of the cow, and in the urine of sucking calves. It can be obtained by the oxidation of uric acid by means of lead dioxide, manganese dioxide, ozone or potassium permanganate:

C5H4N4O3 + H2O + O = C4H6N4O3 + CO2.

It has been synthesized by E. Grimaux by heating one part of glyoxylic acid with two parts of urea for ten hours at 100 deg. C.: 2CO(NH2)2 + CH(OH)2COOH = 3H2O + C4H6N4O3. It forms glancing prisms of neutral reaction slightly soluble in water. On standing with concentrated potassium hydroxide solution it gives potassium allantoate C4H7N4O4K. On heating with water it undergoes hydrolysis into urea and allanturic acid C3H4O3N2. It is reduced by sodium amalgam to glycouril C4H6N4O2, whilst with hydriodic acid it yields urea and hydantoin C3H4N2O2. Hot concentrated sulphuric acid also decomposes allantoin, with production of ammonia, and carbon monoxide and dioxide. By dry distillation it gives ammonium cyanide.

ALLEGHANY, or THE ALLEGHANIES (a spelling now more common than Allegheny), a name formerly used of all the Appalachian Mountains (q.v.), U.S.A., and now sometimes of all that system lying W. and S. of the Hudson river, being steep and narrow-crested in Pennsylvania (1500-1800 ft.), and in Maryland, Virginia and West Virginia higher (3000 ft.-4473 ft). and with broader crests. Another usage applies to the ridges ( ``the Alleghany Ridges'') parallel to the Blue Ridge; the north-western part of this region is sometimes called the Alleghany Front or the Front of the Alleghany Plateau. The Alleghany Plateau is the north-westernmost division of the Appalachian system; it is an eroded mass of sedimentary rock sloping north-westward to the Prairie and Lake Plains and reaching south-west from the south-western part of New York state through Tennessee and into Alabama.

ALLEGHENY, formerly a city of Allegheny county, Pennsylvania, U.S.A., on the N. bank of the Allegheny and Ohio rivers. opposite Pittsburg; since 1907 a part of Pittsburg. Pop. (1890) 105,287; (1900) 129,896, of whom 30,216 were foreign-born and 3315 were negroes; of the foreign-born 12,022 were from Germany, 5070 from Ireland, 3929 from Austria, and 2177 from England; (1906, estimate) 145,240. Allegheny is served by the Baltimore & Ohio and the Pittsburg & Western railways, by the Pittsburg, Ft. Wayne & Chicago, the Western Pennsylvania, the Buffalo & Allegheny Valley, the Cleveland & Pittsburg, the Erie & Pittsburg, the Pittsburg, Youngstown & Ashtabula, and the Chautauqua divisions of the Pennsylvania railway system, and by Ohio river freight and passenger boats. Extending along the river fronts for about 6 1/2 m. are numerous large manufactories and the headquarters of the shipping interests; farther back are the mercantile quarters and public buildings; and on the hills beyond are the residence districts, commanding extensive views of the valley. Two of the principal thoroughfares, Federal and Ohio streets, intersect at a central square, in which are the city hall, public library, post office and the marketplace; and surrounding the main business section on the E., N. and W. is City Park of 100 acres, with lakes and fountains, and monuments to the memory of Alexander von Humboldt, George Washington and T. A. Armstrong. Farther out is Riverview Park (219 acres), in which is the Allegheny Astronomical Observatory, and elsewhere are a soldiers' monument and a monument (erected by Andrew Carnegie) in memory of Colonel Johnes Anderson. In Allegheny are the following institutions of higher learning:--the Allegheny Theological Seminary (United Presbyterian), opened in 1825; the Western Theological Seminary of the Presbyterian Church, opened in 1827; and the Theological Seminary of the Reformed Presbyterians, opened in 1856. There is a fine Carnegie library with a music-hall. Among penal and charitable institutions are the Riverside State Penitentiary, three hospitals, three homes for orphans, a home for the friendless and an industrial school. Six bridges spanning the river and electric lines crossing them have brought Allegheny into close industrial and social relations with the main part of Pittsburg, and on the hills of Allegheny are beautiful homes of wealthy men. As a manufacturing centre Allegheny was outranked in 1905 by only two cities in the state--Philadelphia and Pittsburg; among the more important of its large variety of manufactures are the products of slaughtering and meat-packing establishments, iron and steel rolling mills, the products of foundries and machine- shops, pickles, preserves and sauces, the products of railway- construction and repair shops, locomotives, structural iron and plumbers' supplies. In 1905 the total value of Allegheny's factory products was $45,830,272; this showed an apparent decrease (exceeded by one city only) of $7,365,106, from the product-value of 1900, but the decrease was partly due to the more careful census of 1905, in which there were not the duplications or certain items which occurred in the 1900 census. But in the live years there was a decrease of 3865 in the average number of wage-earners, and the iron and steel output was much less. In 1905 Allegheny ranked first among the cities of the United States in the manufacture of pickles, preserves and sauces, the product ($6,216,778) being 20.9% of that for the whole country. An important industry is the shipment of coal, especially on barges down the Ohio.

Allegheny was laid out in 1788 on a portion of a tract which the state had previously reserved opposite Pittsburg, with a view to bringing some valuable land into the market for the payment of its soldiers' claims. When ordered by the state to be laid out, it was also named as the site of the county-seat of the newly erected county of Allegheny, but the opposition of Pittsburg was so strong that by a supplementary act in the following year that town was made the county-seat. In 1828 Allegheny was incorporated as a borough and in 1840 it was chartered as a city. The city suffered severely in 1874 from a fire started by a fire-cracker on the 4th of July and from a flood caused by a great rain-storm on the 26th of the same month, but these calamities were followed by years of great prosperity and rapid growth. In 1906 the question of uniting Allegheny with Pittsburg under one municipal government was submitted to a joint vote of the electorate of the two cities, in accordance with an act of the state legislature, which had been passed in February of that year, and a large majority voted for the union; but there was determined opposition in Allegheny, every ward of the city voting in the negative; the constitutionality of the act was challenged; the supreme court of the state on the 11th of March 1907 declared the act valid, and on the 18th of November 1907 this decision was affirmed by the Supreme Court of the United States.

See J. E. Parke, Recollections of Seventy Years and Historical Gleanings of Allegheny, Pennsylvania (Boston, 1886).

ALLEGIANCE (Mid. Eng. ligeaunce; med. Lat. ligeantia, &c.; the al- was probably added through confusion with another legal term, allegeance, an allegation; the Fr. allegeance comes from the English; the word is formed from ``liege,'' of which the derivation is given under that heading; the connexion with Lat. ligare, to bind, is erroneous), the duty which a subject or a citizen owes to the state or to the sovereign of the state to which he belongs. It is often used by English legal commentators in a larger sense, divided by them into natural and local, the latter applying to the deference which even a foreigner must pay to the institutions of the country in which he happens to live; but it is in its proper sense, in which it indicates national character and the subjection due to that character, that the word is important. In that sense it represents the feudal liege homage, which could be due only to one lord, while simple homage might be due to every lord under whom the person in question held land. The English doctrine, which was at one time adopted in the United States, asserted that allegiance was indelible:-- Nemo potest exuere patriam. Accordingly, as the law stood before 1870, every person who by birth or naturalization satisfied the conditions described in the article ALIEN, though he should be removed in infancy to another country where his family resided, owed an allegiance to the British crown which he could never resign or lose, except by act of parliament or by the recognition of the independence or the cession of the portion of British territory in which he resided. By the Naturalization Act 1870, it was made possible for British subjects to renounce their nationality and allegiance, and the ways in which that nationality is lost are defined. So British subjects voluntarily naturalized in a foreign state are deemed aliens from the time of such naturalization, unless, in the case of persons naturalized before the passing of the act, they have declared their desire to remain British subjects within two years from the passing of the act. Persons who from having been born within British territory are British subjects, but who at birth became under the law of any foreign state subjects of such state, and also persons who though born abroad are British subjects by reason of parentage, may by declarations of alienage get rid of British nationality. Emigration to an uncivilized country leaves British nationality unaffected: indeed the right claimed by all states to follow with their authority their subjects so emigrating is one of the usual and recognized means of colonial expansion.

The doctrine that no man can cast off his native allegiance without the consent of his sovereign was early abandoned in the United States, and in 1868 congress declared that ``the right of expatriation is a natural and inherent right of all people, indispensable to the enjoyment of the rights of life, liberty and the pursuit of happiness,'' and one of ``the fundamental principles of the republic'' (United States Revised Statutes, sec. 1999). Every citizen of a foreign state in America owes a double allegiance, one to it and one to the United States. He may be guilty of treason against one or both. If the demands of these two sovereigns upon his duty of allegiance come into conflict, those of the United States have the paramount authority in American law.

The oath of allegiance is an oath of fidelity to the sovereign taken by all persons holding important public office and as a condition of naturalization. By ancient common law it might be required of all persons above the age of twelve, and it was repeatedly used as a test for the disaffected. In England it was first imposed by statute in the reign of Elizabeth (1558) and its form has more than once been altered since. Up to the time of the revolution the promise was, ``to be true and faithful to the king and his heirs, and truth and faith to bear of life and limb and terrene honour, and not to know or hear of any ill or damage intended him without defending him therefrom.'' This was thought to favour the doctrine of absolute non-resistance, and accordingly the convention parliament enacted the form that has been in use since that time--``I do sincerely promise and swear that I will be faithful and bear true allegiance to His Majesty . . .'' (see OATH.)

See also the articles CITIZEN, NATURALIZATION: and Salmond on ``Citizenship and Allegiance,'' in the Law Quarterly Review (July 1901, January 1902). (JNO. W.)

ALLEGORY (allos, other, and agoreuein, to speak), a figurative representation conveying a meaning other than and in addition to the literal. It is generally treated as a figure of rhetoric, but the medium of representation is not necessarily language. An allegory may be addressed to the eye, and is often embodied in painting, sculpture or some form of mimetic art. The etymological meaning of the word is wider than that which it bears in actual use. An allegory is distinguished from a metaphor by being longer sustained and more fully carried out in its details, and from an analogy by the fact that the one appeals to the imagination and the other to the reason. The fable or parable is a short allegory with one definite moral. The allegory has been a favourite form in the literature of nearly every nation. The Hebrew scriptures present frequent instances of it, one of the most beautiful being the comparison of the history of Israel to the growth of a vine in the 80th psalm. In classical literature one of the best known allegories is the story of the stomach and its members in the speech of Menenius Agrippa (Livy ii. 32); and several occur in Ovid's Metamorphoses. Perhaps the most elaborate and the most successful specimens of allegory are to be found in the works of English authors. Spenser's Faerie Queene, Swift's Tale of a Tub, Addison's Vision of Mirza, and, above all, Bunyan's Pilgrim's Progress, are examples that it would be impossible to match in elaboration, beauty and fitness, from the literature of any other nation.

ALLEGRI, GREGORIO, Italian priest and musical composer, probably of the Correggio family, was born at Rome either in 1560 or in 1585. He studied music under G. Maria Nanini, the intimate friend of Palestrina. Being intended for the church, he obtained a benefice in the cathedral of Fermo. Here he composed a large number of motets and sacred pieces, which, being brought under the notice of Pope Urban VIII., obtained for him an appointment in the choir of the Sistine Chapel at Rome. He held this from December 1629 till his death on the 18th of February 1652. His character seems to have been singularly pure and benevolent. Among the musical compositions of Allegri were two volumes of concerti, published in 1618 and 1619; two volumes of motets, published in 1620 and 1621; besides a number of works still in manuscript. He was one of the earliest composers for stringed instruments, and Kircher has given one specimen of this class of his works in the Musurgia. But the most celebrated composition of Allegri is the Miserere, still annually performed in the Sistine Chapel at Rome. It is written for two choirs, the one of five and the other of four voices, and has obtained a celebrity which, if not entirely factitious, is certainly not due to its intrinsic merits alone. The mystery in which the composition was long enshrouded, no single copy being allowed to reach the public, the place and circumstances of the performance, and the added embellishments of the singers, account to a great degree for much of the impressive effect of which all who have heard the music speak. This view is confirmed by the fact that, when the music was performed at Venice by permission of the pope, it produced so little effect that the emperor Leopold I., at whose request the manuscript had been sent, thought that something else had been substituted. In spite of the precautions of the popes, the Miserere has long been public property. In 1769 Mozart (q.v.) heard it and wrote it down, and in 1771 a copy was procured and published in England by Dr Burney. The entire music performed at Rome in Holy Week, Allegri's Miserere included, has been issued at Leipzig by Breitkopf and Hartel. Interesting accounts of the impression produced by the performance at Rome may be found in the first volume of Mendelssohn's letters and in Miss Taylor's Letters from Italy.

ALLEGRO (an Italian word, meaning ``cheerful,'' as in Milton's poem), a term in music to indicate quick or lively time, coming between andante and presto; it is frequently modified by the addition of qualifying words. It is also used of a separate piece of music, or of a movement in a sonata, symphony, &c.

ALLEINE, JOSEPH (1634-1668), English Nonconformist divine, belonged to a family originally settled in Suffolk. As early as 1430 some of them--sprung of Alan, lord of Buckenhall --settled in the neighbourhood of Calne and Devizes, whence descended the immediate ancestors of ``worthy Mr Tobie Alleine of Devizes,'' father of Joseph, who, the fourth of a large family, was born at Devizes early in 1634. 1645 is marked in the title-page of a quaint old tractate, by an eye-witness, as the year of his setting forth in the Christian race. His elder brother Edward had been a clergyman, but in this year died; and Joseph entreated his father that he might be educated to succeed his brother in the ministry. In April 1649 he entered Lincoln College, Oxford, and on the 3rd of November 1651 he became scholar of Corpus Christi College. On the 6th of July 1653 he took the degree of B.D., and became a tutor and chaplain of Corpus Christi, preferring this to a fellowship. In 1654 he had offers of high preferment in the state, which he declined; but in 1655 George Newton, of the great church of St Mary Magdalene, Taunton, sought him for assistant and Alleine accepted the invitation. Almost coincident with his ordination as associate pastor came his marriage with Theodosia Alleine, daughter of Richard Alleine. Friendships among ``gentle and simple''--of the former, with Lady Farewell, grand-daughter of the protector Somerset--bear witness to the attraction of Alleine's private life. His public life was a model of pastoral devotion. This is all the more remarkable as he found time to continue his studies, one monument of which was his Theologia Philosophica (a lost MS.), a learned attempt to harmonize revelation and nature, which drew forth the wonder of Baxter. Alleine was no mere scholar or divine, but a man who associated on equal terms with the founders of the Royal Society. These scientific studies were, however, kept in subordination to his proper work. The extent of his influence was, in so young a man, unique, resting on the earnestness and force of his nature. The year 1662 found senior and junior pastors like-minded, and both were among the two thousand ejected ministers. Alleine, with John Wesley (grandfather of the celebrated John Wesley), also ejected, then travelled about, preaching wherever opportunity was found. For this he was cast into prison, indicted at sessions, bullied and fined. His Letters from Prison were an earlier Cardiphonia than John Newton's. He was released on the 26th of May 1664; and in spite of the Conventicle, or Five Mile Act, he resumed his preaching. He found himself again in prison, and again and again a sufferer. His remaining years were full of troubles and persecutions nobly borne, till at last, worn out by them, he died on the 17th of November 1668; and the mourners, remembering their beloved minister's words while yet with them, ``If I should die fifty miles away, let me be buried at Taunton,'' found a grave for him in St Mary's chancel. No Puritan nonconformist name is so affectionately cherished as is that of Joseph Alleine. His chief literary work was An Alarm to the Unconverted (1672), otherwise known as The Sure Guide to Heaven, which had an enormous circulation. His Remains appeared in 1674.

See Life, edited by Baxter; Joseph Alleine: his Companions and Times, by Charles Stanford (1861); Wood's Athenae, iii. 819; Palmer's Nonc. Mem. iii. 208.

ALLEINE, RICHARD (1611-1681), English Puritan divine, was born at Ditcheat, Somerset, where his father was rector. He was a younger brother of William Alleine, the saintly vicar of Blandford. Richard was educated at St Alban's Hall, Oxford, where he was entered commoner in 1627, and whence, having taken the degree of B.A., he transferred himself to New Inn, continuing there until he proceeded M.A. On being ordained he became assistant to his father, and immediately stirred the entire county by his burning eloquence. In March 1641 he succeeded the many-sided Richard Bernard as rector of Batcomb (Somerset). He declared himself on the side of the Puritans by subscribing ``The testimony of the ministers in Somersetshire to the truth of Jesus Christ,'' and ``The Solemn League and Covenant,'' and assisted the commissioners of the parliament in their work of ejecting unsatisfactory ministers. Alleine continued for twenty years rector of Batcomb and was one of the two thousand ministers ejected in 1662. The Five Mile Act drove him to Frome Selwood, and in that neighbourhood he preached until his death on the 22nd of December 1681. His works are all of a deeply spiritual character. His Vindiciae Pietatis (which first appeared in 1660) was refused licence by Archbishop Sheldon, and was published, in common with other nonconformist books, without it. It was rapidly bought up and ``did much to mend this bad world.'' Roger Norton, the king's printer, caused a large part of the first impression to be seized on the ground of its not being licensed and to be sent to the royal kitchen. Glancing over its pages, however, it seemed to him a sin that a book so holy--and so saleable--should be destroyed. He therefore bought back the sheets, says Calamy, for an old song, bound them and sold them in his own shop. This in turn was complained of, and he had to beg pardon on his knees before the council-table; and the remaining copies were sentenced to be ``bisked,'' or rubbed over with an inky brush, and sent back to the kitchen for lighting fires. Such ``bisked'' copies occasionally occur still. The book was not killed. It was often reissued with additions, The Godly Man's Portion in 1663, Heaven Opened in 1666, The World Conquered in 1668. He also published a book of sermons Godly Fear, in 1664, and other less noticeable devotional compilations.

See Calamy, s.v.; Palmer's Nonconf: Mem. iii. 167-168; C. Stanford's Joseph Ailleine; Researches at Batcomb and Frome Selwood; Wood's Athenae (Bliss), iv. 13.

ALLEMANDE (Fr. for danse allemande, or German dance), a name for two kinds of dance, one a German national dance, in 2-4 time, the other somewhat resembling a waltz. The movement in a suite following the prelude, and preceding the courante (q.v.), with which it is contrasted in rhythm, is also called an allemande, but has no connexion with the dance. The name, however, is given to pieces of music based on the dance movement, examples of which are found in Beethoven's German dances for the orchestra.

ALLEN, ETHAN (1739--1789), American soldier, was born at Litchfield, Connecticut, on the 10th of January 1739. He removed, probably in 1769, to the ``New Hampshire Grants,'' where he took up lands, and eventually became a leader of those who refused to recognize the jurisdiction of New York, and contended for the organization of the ``Grants'' into a separate province. About 1771 he was placed at the head of the ``Green Mountain Boys,'' an irregular force organized for resistance to the ``Yorkers.'' On the 10th of May 1775, soon after the outbreak of the War of American Independence, in command of a force, which he had assisted some members of the Connecticut assembly to raise for the purpose, he captured Ticonderoga from its British garrison, calling upon its commanding officer --according to the unverified account of Allen himself-- to surrender ``in the name of the great Jehovah and the Continental Congress.'' Seth Warner being elected colonel of the ``Green Mountain Boys'' in July 1775, Allen, piqued, joined General Philip Schuyler, and later with a small command, but without rank, accompanied General Richard Montgomery's expedition against Canada. On the 25th of September 1775 near Montreal he was captured by the British, and until exchanged on the 6th of May 1778 remained a prisoner at Falmouth, England, at Halifax, Nova Scotia, and in New York. Upon his release he was brevetted colonel by the Continental Congress. He then, as brigadier-general of the militia of Vermont, resumed his opposition to New York, and from 1779 to 1783, acting with his brother, Ira Allen, and several others, carried on negotiations, indirectly, with Governor Frederick Haldimand of Canada, who hoped to win the Vermonters over to the British cause. He seems to have assured Haldimand's agent that ``I shall do everything in my power to make this state a British province.'' In March 1781 he wrote to Congress, with characteristic bluster, ``I am as resolutely determined to defend the independence of Vermont as congress that of the United States, and rather than fail will retire with the hardy Green Mountain Boys into the desolate caverns of the mountains and wage war with human nature at large.'' He removed to Burlington, Vermont, in 1787, and died there on the 11th of February 1789. He was, says Tyler, ``a blustering frontier hero--an able-minded ignoramus of rough and ready humour, of boundless self-confidence, and of a shrewdness in thought and action equal to almost any emergency.'' Allen wrote a Narrative of Colonel Ethan Allen's Captivity (1779), the most celebrated book in the ``prison literature'' of the American revolution; A Vindication of the Inhabitants of Vermont to the Government of New York and their Right to term an Independent Slate (1779); and Reason, the Only Oracle of Man; or A Compendious System of Natural Religion, Alternately adorned with Confutations of a Variety of Doctrines incompatible with it (1784).

Ethan's youngest brother, IRA ALLEN (1751--1814), born on the 21st of April 1751 at Cornwall, Connecticut, also removed to the New Hampshire Grants, where he became one of the most influential political leaders. In 1775 he took part in the capture of Ticonderoga and the invasion of Canada. He was a member of the convention which met at Winchester, Vermont, and in January 1777 declared the independence of the New Hampshire Grants; served (1776-1786) as a member of the Vermont council of safety; conducted negotiations, on behalf of Vermont, for a truce with the British and for an exchange of prisoners, in 1781; served for eight terms in the general assembly, and was state treasurer from 1778 to 1786 and surveyor-general from 1778 to 1787. In 1789, by a gift of L. 4000, he made possible the establishment of the university of Vermont, of which institution, chartered in 1791 and built at Burlington in deference to his wishes, he was thus virtually the founder. In 1795, on behalf of the state, he purchased from the French government arms for the Vermont militia, of which he was then the ranking major-general, but he was captured by a British cruiser west of Ireland on his return journey, was charged with attempting to furnish insurrectionary Irish with arms, and after prolonged litigation in the British courts, the case not being finally decided until 1504, returned to Vermont in 1801. During his absence he had been dispossessed of his large holdings of land through the operation of tax laws, and to escape imprisonment for debt, he removed to Philadelphia, where on the 4th of January 1814 he died. He published a dull and biassed, but useful Natural and Political History of Vermont (1798), reissued (1870) in vol. i. of the Collections of the Vermont Historical Society.

There is no adequate biography of Ethan Allen, but Henry Hall's Ethan Allen (New York, 1892) may be consulted. The best literary estimate may be found in M. C. Tyler's Literary History of the American Revolution (2 vols., New York, 1897).

ALLEN, GRANT [CHARLES GRANT BLAIRFINDIE], (1848--1899), English author, son of a clergyman of Irish descent, was born at Kingston, Ontario, Canada, on the 24th of February 1848. He was educated partly in America and France, and in England at King Edward's School, Birmingham, and afterwards at Merton, Oxford. He was for a few years a schoolmaster in Jamaica, but then made his home in England, where he became prominent as a writer. He died at his house on Hindhead, Haslemere, on the 24th of October 1899. Grant Allen was a voluminous author. He was full of interesting scientific knowledge and had a gift for expression both in biological exposition and in fiction. His more purely scientific books (such as Physiological Aesthetics, 1877; The Evolutionist at Large, 1881; The Evolution of the Idea of God, 1897) contain much original matter, popularly expressed, and he was a cultured exponent of the evolutionary idea in various aspects of biology and anthropology. He first attracted attention as a novelist with a sensational story, The Devil's Die (1888), though this was by no means his first attempt at fiction; and The Woman who Did (1895), which had a succes de scandale on account of its treatment of the sexual problem, had for the moment a number of cheap imitators. Other volumes flowed from his pen, and his name became well known in contemporary literature. But his reputation was essentially contemporary and characteristic of the vogue peculiar to the journalistic type.

ALLEN, JAMES LANE (1850- ), American novelist, was born near Lexington, Rentucky, on the 21st of December 1850. He graduated at Kentucky University, Lexington, in 1872, taught at Fort Spring, Kentucky, at Richmond and at Lexington, Missouri, and from 1877 to 1879 at the academy of Kentucky University, where he was principal and taught modern languages; in 1880 he was professor of Latin and English at Bethany College, Bethany, West Virginia; and then became head of a private school at Lexington, Kentucky. Subsequently he gave up teaching, went to New York City, where he secured commissions for sketches of the ``Blue Grass'' region, and thereafter devoted himself to literature. His Choir Invisible, coming after other successful stories, made his name well known in England as well as America. His published works include: With Flute and Violin (1891), The Blue Grass Region (1892), John Gray (1893), A Kentucky Cardinal (1894), Aftermath (1895), A Summer in Arcady (1896), The Choir Invisible (1897), The Reign of Law' (1900), The Mettle of the Pasture (1903), and The Bride of the Mistleloe (1909.)

ALLEN, JOHN (1476--1534), English divine, after studying at both Oxford and Cambridge, was sent by Archbishop Warham on an ecclesiastical mission to Rome. On his return he held a number of livings in succession, and in 1516 was rector of South Ockendon, Essex, and prebendary of Lincoln Cathedral. In the suppression of the minor monasteries in 1524--1525 he gave Wolsey much assistance, and became prebendary of Nottingham in 1526 and of St Paul's, London, in 1527. These prebends he resigned in 1528 on his election as archbishop of Dublin. For four years he was chancellor of Ireland but his career was full of trouble. In 1531 he was fined under the Statutes of Provisors and Praemunire, and in 1534 met a violent death at the hands of Lord Thomas Fitzgerald's followers.

ALLEN, or ALLEYN, THOMAS (1542-1632), English mathematician, was born at Uttoxeter in Staffordshire on the 21st of December 1542. He was admitted scholar of Trinity College, Oxford, in 1561; and graduated as M.A. in 1567. In 1580 he quitted his college and fellowship, retired to Gloucester Hall, and became famous for his knowledge of antiquity, philosophy and mathematics. Having received an invitation from Henry Percy, earl of Northumberland, a great friend and patron of men of science, he spent some time at the earl's house, where he became acquainted with Thomas Harriot, John Dee and other famous mathematicians. He was also intimate with Sir Robert Cotton, William Camden, and their antiquarian associates. Robert Dudley, earl of Leicester, had a particular esteem for Allen, and would have conferred a bishopric upon him, but his love of solitude made him decline the offer. His great skill in mathematics and astrology earned him the credit of being a magician; and the author of Leicester's Commonwealth accuses him of employing the art of ``figuring'' to further the earl of Leicester's unlawful designs, and of endeavouring by the black art to bring about a match between his patron and Queen Elizabeth. Allen was indefatigable in collecting scattered manuscripts relating to history, antiquity, astronomy, philosophy and mathematics. A considerable part of his collection was presented to the Bodleian library by Sir Kenelm Digby. He died on the 30th of September 1632 at Gloucester Hall. He published in Latin the second and third books of Claudius Ptolemy of Pelusium, Concerning the Judgment of the Stars, or, as it is commonly called, of the Quadripartite Construction, with an Exposition. He also wrote notes on John Bale's De Scriptoribus M. Britanniae.

ALLEN, WILLIAM (1532-1594), English cardinal, born at Rossall, Lancashire, went in 1547 to Oriel College, Oxford, and in 1556 became principal of St Mary Hall and proctor. According to Anthony Wood, he was appointed to a canonry at York in or about 1558; he therefore had already entered the clerical state by receiving the tonsure. On the accession of Elizabeth, he was deprived upon refusing the oath of supremacy, but remained in Ihe university until 1561. His known opposition to the new learning in religion giving much offence, he escaped from England and went to Louvain, where were gathered many students who had left the English universities for conscience' sake. Here he continued his theological studies and began to write controversial treatises. In 1562, on account of health, he returned secretly to Lancashire and did much, by exhortation and private meetings, to restrain those Catholics who attended the new services in order to save their property from confiscation. His presence being known to the government, he left Lancashire and retired to the neighbourhood of Oxford, which he frequently visited, and where he influenced many of the students. After writing a treatise in defence of the priestly power to remit sins, he was obliged to leave and retired to Norfolk, leaving England soon after in 1565. He returned to Flanders, was ordained at Malines, and began to lecture in theology at the Benedictine college in that city. In 1567 he went to Rome for the first time, and there began his plan for establishing a college where English students could live together and finish their theological course. The idea subsequently developed into the establishing of a missionary college, or seminary, to keep up a supply of priests for England as long as the country remained separated from the Holy See. With the help of friends, and notably of the Benedictine abbots of the neighbouring monasteries, a college was established at Douai (September 29, 1568); and here Allen was joined by many of the English exiles. This college, the first of the seminaries ordered by the council of Trent, received the papal approval shortly after its establishment; the king of Spain took it under his protection and assigned it an annual grant. Allen continued his own theological studies and, after taking his doctorate, became regius professor at the university. Gregory XIII. in 1575 granted him a monthly pension of 100 golden crowns, and, as the number of students had now risen to one hundred and twenty, summoned him to Rome to undertake the establishing of a similar college in the papal city. By Allen's advice, the old English hospice was turned into a seminary and Jesuits were placed there to help Dr Maurice Clennock, the rector. The pope appointed Allen to a canonry in Courtrai and sent him back to Douai (July 1576); but here he had to face a new difficulty. Besides the reported plots to assassinate him by agents of the English government, the insurgents against Spain, urged on by Elizabeth's emissaries, expelled the students from Douai as being partisans of the enemy (March 1578). Allen moved his establishment to Reims under the protection of the house of Guise; and it was here that the English translation of the Scriptures, known as the Douai Version, was begun under his direction (see BIBLE, ENGLISH.) In 1577 he began a correspondence with Robert Parsons (q.v.), the Jesuit, an intimacy that was fraught with disaster. He was summoned again to Rome in 1579 to quell the first of the many disturbances that befell the English college under the Jesuit influence. Brought now into personal contact with Parsons, Allen fell completely under the dominating personality of the redoubtable Jesuit, and gave himself up entirely to his influence. He arranged that the Society should take over the English college at Rome and should begin the Jesuit mission to England (1580). This short-sighted policy was the cause of much grave trouble in the near future. Returning to Reims he began to take a part in all the political intrigues which Parsons' fertile brain had hatched for the promotion of the Spanish interest in England. Allen's political career dates from this period. Parsons had already intended to remove Allen from the seminary at Reims, and for this purpose, as far back as the 6th of April 1581, had recommended him to Philip II. to be promoted to the cardinalate. In furtherance of the intrigues, Allen and Parsons went to Rome again in 1585 and there Allen was kept for the rest of his life. In 1587, during the time that he was being skilfully played with by Philip's agents, he wrote, helped by Parsons, a shameless defence of a shameful deed. Sir William Stanley, an English olficer, had surrendered Deventer to the Spaniards; and Allen wrote a book in defence of Stanley, saying that all Englishmen were bound, under pain of damnation, to follow the traitorous example, as Elizabeth was no lawful queen. He shared in all the projects for the invasion of England, and was to have been archbishop of Canterbury and lord chancellor had they succeeded. Representing in reality only his own party, Allen had on the continent the position of the head of the Roman Catholics of England; and as such, just after the death of Mary, queen of Scots, he wrote to Philip II. (March 19, 1587) to exhort him to undertake the enterprise against England, and declared that the Catholics there were clamouring for the king to come and punish ``this woman, hated by God and man.'' After much negotiation, he was made cardinal by Sixtus V. on the 7th of August 1587, nominally to supply the loss of the queen of Scotland, but in reality to ensure the success of the Armada. On his promotion Allen wrote to Reims that he owed the hat, under God, to Parsons. One of his first acts was to issue, under his own name, two violent works for the purpose of inciting the Catholics of England to rise against Elizabeth: ``The Declaration of the Sentence of Sixtus V.'' a broadside, and a book, All Admonition to the nobility and people of England (Antwerp, 1588). On the failure of the Armada, Philip, to get rid of the burthen of supporting Allen as a cardinal, nominated him to the archbishopric of Malines, but the canonical appointment was never made. Gregory XIV. made him librarian at the Vatican; and he served on the commission for the revision of the Vulgate. He took part in four conclaves, but never had any real influence after the failure of the Armada. Before his death, which took place in Rome on the 16th of October 1594, he found reasons to change his mind concerning the wisdom of the Jesuit politics in Rome and England, and would have tried to curb their activities, had he been spared. The rift became so great that ten years after his death, Agazzari could write to Parsons: ``So long as Allen walked in this matter (the scheme for England) in union with and fidelity to the Company, as he used to do, God preserved him, prospered and exalted him; but when he began to leave this path, in a manner, the threads of his plans and life were cut short together.'' As a cardinal Allen had lived in poverty and he died in debt.

While we cannot withhold a tribute of respect from Allen for his zeal and earnestness, and recognize that his foundation at Douai survives to-day in the two Catholic colleges at Ushaw and Ware, it is impossible to deny that he injured the work with which his name will ever be associated, by his disastrous intercourse with Father Parsons. Known as a sharer in that plotter's schemes, he gave a reasonable pretext to Elizabeth's government for regarding the seminaries as hotbeds of sedition. That they were not so is abundantly proved. The superiors kept their political actions secret from the students, and would not allow such matters even to be talked about or treated as theoretical abstractions in the schools. Dr Barrett, writing (April 14, 1583) to Parsons, makes open complaint of Allen's secrecy and refusal to communicate. How far Allen was really admitted to the full confidence of Parsons is a question; and his later attitude to the Society goes to prove that he at last realized that he had been tricked. Like James II. with Fr. Petre, Allen had been ``bewitched'' for a time and only recovered himself when too late.

AUTHORITIES. -- T. F. Knox, Letters and Memorials of Cardinal Allen (London, 1882); A. Bellesheim, Wilhelm Cardinal Allen und die englischen Seminare auf dem Festlande (Mainz, 1885); First and Second Diaries of the English College, Douai (London, 1878); Nicholas Fitzherbert, De Antiquitate et continuatione religionis in Anglia et de Alani Cardinalis vita libellus (Rome, 1608); E. Taunton, History of the Jesuits in England (London, 1901); Teulet, vol. v.; the Spanish State Papers (Simancas), vols. iii. and iv.; a list of Allen's works is given in J. Gillow, Biographical Dictionary of English Catholics, vol. i., under his name. (E. TN.)

ALLEN, WILLIAM FRANCIS (1830-1889), American classical scholar, was born at Northborough, Massachusetts, on the 5th of September 1830. He graduated at Harvard College in 1851 and subsequently devoted himself almost entirely to literary work and teaching. In 1867 he became professor of ancient languages and history (afterwards Latin language and Roman history) in the university of Wisconsin. He died in December 1889. His contributions to classical literature chiefly consist of schoolbooks published in the Allen (his brother) and Greenough series. The Collection of Slave Songs (1867), of which he was joint-editor, was the first work of the kind ever published.

ALLEN, BOG OF, the name given to a congeries of morasses in Kildare, King's County, Queen's County and Westmeath, Ireland. Clane Bog, the eastern extremity, is within 17 m. of Dublin, and the morasses extend westward almost to the Shannon. Their total area is about 238,500 acres. They do not form one continuous bog, the tract of the country to which the name is given being intersected by strips of dry cultivated land. The rivers Brosna, Barrow and Boyne take their rise in these morasses, and the Grand and Royal canals cross them. The Bog of Allen has a general elevation of 250 ft. above sea level, and the average thickness of the peat of which it consists is 25 ft. It rests on a subsoil of clay and marl.

ALLENSTEIN, a garrison town of Germany, in the province of East Prussia, on the river Alle, 100 m. by rail N.E. from Thorn, and 30 m. from the Russian frontier. Pop. (1900) 24,295. It has a medieval castle, several churches, a synagogue and various industries--iron-foundries, saw-mills, brick-works, and breweries; also an extensive trade in cereals and timber.

ALLENTOWN, a city and the county-seat of Lehigh county, Pennsylvania, U.S.A., on the Lehigh river, about 62 m. N.N.W. of Philadelphia. Pop. (1890) 25,228; (1900) 35,416, of whom 2994 were foreign-born, 1065 being of German birth; (1910) 51,913. It is served by the Central of New Jersey, the Lehigh Valley, the Perkiomen (of the Reading system) and the Philadelphia & Reading railways. The city is situated on high ground sloping gently towards the river and commanding diversified views of the surrounding country. Hamilton Street, the principal business thoroughfare, extends over 2 m. from E. to W., and in what was once the centre of the city is Centre Square, in which there is a monument to the memory of the soldiers and sailors who fell in the Civil War. Allentown is the seat of a state homoeopathic hospital for the insane, of the Allentown College for Women (Reformed Church, 1867), and of Muhlenberg College (1867), an Evangelical Lutheran institution which grew out of the Allentown Seminary (established in 1848 and incorporated as the ``Allentown Collegiate Institute and Military Academy'' in 1864); in 1907 the college had 191 students, of whom 109 were in the Allentown Preparatory School (1904), formerly the academic department of the college and still closely afliliated with it. The surrounding country is well adapted to agriculture, and slate, iron ore, cement rock and limestone are found in the vicinity. Allentown is an important manufacturing centre, and the value of its manufactured products increased 90.9% from 1890 to 1900, and of its factory product 13.2% between 1900 and 1905. In 1905 the city ranked sixth among the cities of the country in the manufacture of silk and silk goods, its most important industry. Other important manufactures are iron and steel, slaughtering and meat-packing products, boots and shoes, cigars, furniture, men's clothing, hosiery and knit goods, jute and jute goods, linen-thread, malt liquors, brick, cement, barbed wire, wire nails and planing-mill products. Allentown's total factory product in 1905 was valued at $16,966,550, of which $3,901,249, or 23%, was the value of silk and silk goods. The municipality owns and operates its water-works. Allentown was first settled in 1751; in 1762 it was laid out as a town by James Allen, the son of a chief-justice of the province, in honour of whose family the city is named; in 1811 it was incorporated as a borough and its name was changed to Northampton; in 1812 it was made the county-seat; in 1838 the present name was again adopted; and in 1867 the first city charter was secured. The silk industry was introduced in 1881.

ALLEPPI, or AULAPALAY, a seaport of southern India, in the state of Travancore, 33 m. south of Cochin, situated on a strip of coast between the sea and one of those backwaters that here form the chief means of inland communication. Pop. (1901) 24,918. There is a lighthouse, 85 ft. high, with a revolving white light visible 18 m. out at sea. Though the third town in the state in point of population, Alleppi is the first in commercial importance. It commands a fine harbour, affording safe anchorage for the greater part of the year. It was opened to foreign trade towards the latter end of the 18th century. The exports consist of coffee, pepper, cardamoms and coco-nuts. There are factories for coir-matting. The raja has a palace, and Protestant missionaries have a church.

ALLESTREE, or ALLESTRY, RICHARD (1619.-1681), royalist divine and provost of Eton College, son of Robert Allestree, and a descendant of an ancient Derbyshire family, was born at Uppington in Shropshire. He was educated at Coventry and later at Christ Church, Oxford, under Richard Busby. He entered as a commoner in 1636, was made student shortly afterwards, and took the degree of B.A. in 1640 and of M.A. in 1643. In 1642 he took up arms for the king under Sir John Biron. On the arrival of the parliamentary forces soon afterwards in Oxford he secreted the Christ Church valuables, and the soldiers found nothing in the treasury ``except a single groat and a halter in the bottom of a large iron chest.'' He escaped severe punishment only by the hasty retirement of the army from the town. He was present at the battle of Edgehill in October 1642, after which, while hastening to Oxford to prepare for the king's visit to Christ Church, he was captured by a troop of Lord Say's soldiers from Broughton House, being soon afterwards set free on the surrender of the place to the king's forces. In 1643 he was again under arms, performing ``all duties of a common soldier'' and ``frequently holding his musket in one hand and his book in the other.'' At the close of the Civil War, he returned to his studies, took holy orders, was made censor and became a ``noted tutor.'' But he still remained an ardent royalist. He voted for the university decree against the Covenant, and, refusing submission to the parliamentary visitors in 1648, he was expelled. He found a retreat as chaplain in the house of the Hon. Francis Newport, afterwards Viscount Newport, in whose interests he undertook a journey to France. On his return he joined two of his friends, Dolben and Fell, afterwards respectively archbishop of York and bishop of Oxford, then resident at Oxford, and later joined the household of Sir Antony Cope of Hanwell, near Banbury. He was now frequently employed in carrying despatches between the king and the royalists in England. In May 1659 he brought a command from Charles in Brussels, directing the bishop of Salisbury to summon all those bishops, who were then alive, to consecrate clergymen to various sees ``to secure a continuation of the order in the Church of England,'' then in danger of becoming extinct.1 While returning from one of these missions, in the winter before the Restoration, he was arrested at Dover and committed a prisoner to Lambeth Palace, then used as a gaol for apprehended royalists, but was liberated after confinement of a few weeks at the instance, among others, of Lord Shaftesbury. At the Restoration he became canon of Christ Church, D.D. and city lecturer at Oxford. In 1663 he was made chaplain to the king and regius professor of divinity. In 1665 he was appointed provost of Eton College, and proved himself a capable administrator. He introduced order into the disorganized finances of the college and procured the confirmation of Laud's decree, which reserved five of the Eton fellowships for members of King's College. His additions to the college buildings were less successful; for the ``Upper School,'' constructed by him at his own expense, was falling into ruin almost in his lifetime, and was replaced by the present structure in 1689. Allestree died on the 28th of January 1681, and was buried in the chapel at Eton College, where there is a Latin inscription to his memory. His writings are:--The Privileges of the Universily of Oxford in point of Visitation (1647)--a tract answered by Prynne in the University of Oxford's Plea Rejected; 18 sermons whereof 15 preached before the king . . . (1669); 40 sermons whereof 21 are now first published . . . (2 vols., 1684); sermons published separately including A Sermon on Acts xiii. 2, (1660); A Paraphrase and Annotations upon all the Epistles of St Paul (joint author with Abraham Woodhead and Obadiah Walker, 1675, see edition of 1853 and preface by W. Jacobson). In the Cases of Conscience by J. Barlow, Bishop of Lincoln (1692), Allestree's judgment on Mr Cottington's Case of Divorce is included. A share in the composition, if not the sole authorship, of the books published under the name of the author of the Whole Duty of Man has been attributed to Allestree (Nichols's Anecdotes, ii. 603), and the tendency of modern criticism is to regard him as the author. His lectures, with which he was dissatisfied, were not published. Allestree was a man of extensive learning, of moderate views and a fine preacher. He was generous and charitable, of ``a solid and masculine kindness,'' and of a temper hot, but completely under control.

AUTHORITIES.---Wood's Athenae Oxonienses (edited by Bliss), iii. 1269; W.ood's Fasti, i. 480, 514, ii. 57, 241, 370; Richard Allestree, 40 sermons, with biographical preface by Dr John Fell (2 vols., 1684); Sufferings of the Clergy, by John Walker; Architectural History of Eton and Cambridge, by R. Willis, i. 420; Hist. of Eton College, by Sir H. C. Maxwell-Lyte; Hist. of Eton College, by Lionel Cust (1899); Egerton MSS., Brit. Mus. 2807 f. 197 b. For Allestree's authorship of the Whole Duty of Man, see Rev. F. Barham, Journal of Sacred Literature, July 1864, and C. E. Doble's articles in the Academy, November 1884. (P. C. Y.)

1 Egerton MSS., Brit. Mus. 2807 f. 197 b; Li/e of Dr John Barwick, ed. by G. F. Barwick (1903), pp. 107, 129, 134.

ALLEY (from the Fr: allee, a walk), a narrow passageway between two buildings available only for foot passengers or hand-carts, sometimes entered only at one end and known as a ``blind alley,'' or cul-de-sac. The name is also given to the long narrow enclosures where bowls or skittles are played.

ALLEYN, EDWARD (1566-1626), English actor and founder of Dulwich College, was born in London on the 1st of September 1566, the son of an innkeeper. It is not known at what date he began to act, but he certainly gained distinction in his calling while a young man, for in 1586 his name was on the list of the earl of Worcester's players, and he was eventually rated by common consent as the foremost actor of his time. Ben Jonson, a critic little prone to exalt the merits of men of mark among his contemporaries, bestowed unstinted praise on Alleyn's acting (Epigrams, No. 89). Nash expresses in prose, in Pierce Penniless, his admiration of him, while Heywood calls him ``inimitable,'' ``the best of actors,'' ``Proteus for shapes and Roscius for a tongue.'' Alleyn inherited house property in Bishopsgate from his father. His marriage on the 22nd of October 1592 with Joan Woodward, stepdaughter of Philip Henslowe, brought him eventually more wealth. He became part owner in Henslowe's ventures, and in the end sole proprietor of several play-houses and other profitable pleasure resorts. Among these were the Rose Theatre at Bankside, the Paris Garden and the Fortune Theatre in St Luke's--the latter occupied by the earl of Nottingham's company, of which Alleyn was the head. He filled, too, in conjunction with Henslowe, the post of ``master of the king's games of bears, bulls and dogs.'' On some occasions he directed the sport in person, and Stow in his Chronicles gives an account of how Alleyn baited a lion before James I. at the Tower.

Alleyn's connexion with Dulwich began in 1605, when he bought the manor of Dulwich from Sir Francis Cation. The landed property, of which the entire estate had not passed into Alleyn's hands earlier than 1614, stretched from the crest of that range of Surrey hills on whose summit now stands the Crystal Palace, to the crest of the parallel ridge, three miles nearer London, known in its several portions as Herne Hill, Denmark Hill and Champion Hill. Alleyn acquired this large property for little more than L. 10,000. He had barely got full possession, however, before the question how to dispose of it began to occupy him. He was still childless, after twenty years of wedded life. Then it was that the prosperous player--the man ``so acting to the life that he made any part to become him'' (Fuller, Worthies)--began the task of building and endowing in his own lifetime the College of God's Gift at Dulwich. All was completed in 1617 except the charter or deed of incorporation for setting his lands in mortmain. Tedious delays occurred in the Star Chamber, where Lord Chancellor Bacon was scheming to bring the pressure of kingly authority to bear on Alleyn with the aim of securing a large portion of the proposed endowment for the maintenance of lectureships at Oxford and Cambridge. Alleyn finally carried his point and the College of God's Gift at Dulwich was founded, and endowed under letters patent of James I., dated the 21st of June 1619. The building had been already begun in 1613 (see DULWICH.) Alleyn was never a member of his own foundation, but he continued to the close of his life to guide and control its affairs under powers reserved to himself in the letters patent. His diary shows that he mixed much and intimately in the life of the college. Many of the jottings in that curious record of daily doings and incidents favour the inference that he was a genial, kind, amiable and religious man. His fondness for his old profession is indicated by the fact that he engaged the boys in occasional theatrical performances. At a festive gathering on the 6th of January 1622 ``the boyes play'd a playe.''

Alleyn's first wife died in 1623. The same year he married Constance, daughter of John Donne, the poet and dean of St Paul's. Alleyn died in November 1626 and was buried in the chapel of the college which he had founded. His gravestone fixes the day of his death as the 21st, but there are grounds for the belief that it was the 25th. A portrait of the actor is preserved at Dulwich. Alleyn was a member of the corporation of wardens of St Saviour's, Southwark, in 1610, and there is a memorial window to him in the cathedral.

ALL FOURS, a card game (known also in America as Seven Up, Old Sledge or High-Low-Jack) usually played by two players, though four may play. A full pack is used and each player receives seven counters. Four points can be scored, one each for high, the highest trump out, for low, the lowest trump dealt, for Jack, the knave of trumps, and for game, the majority of pips in the cards of the tricks that a player has won. Ace counts 4, King 3, Queen 2, Knave 1, and ten 10 points. Low is scored by the person to whom it is dealt; High of course wins a trick; Jack is scored by the player who finally has it among his tricks. If Jack is turned up the dealer scores the point. A player who plays a high or low trump is entitled to ask if they are High or Low. The game is 10 or 11 points. Six cards are dealt to each, the thirteenth being turned up for trumps. The non-dealer may propose or beg if he does not like his hand. If the dealer refuses the elder hand scores a point; if he consents he gives and takes three more cards, the seventh being turned up for trumps, which must be of a different suit from the original trump card; otherwise six more cards are dealt out, and so on till a fresh trump suit appears. The non-dealer then leads; the other must trump or follow suit, or forfeit a point. Jack may be played to any trick. Each pair of cards is a trick, and is collected by the winner. A fresh deal may be claimed if the dealer exposes one of his adversary's cards, or if he gives himself or his adversary too few or too many. In that case the error must be discovered before a card is played (see also AUCTION PITCH.)

ALLIA (mod. Fosso Bettinia), a small tributary of the river Tiber, joining it on the left (east) bank, about 11 m. N. of Rome. It gave its name to the terrible defeat which the Romans suffered at the hands of the Gauls on the 18th of July 390 B.C. Livy (v. 37) and Diodorus (v. 114) differ with regard to the site of the battle, the former putting it on the left, the latter on the right bank of the Tiber. Mommsen and others support Diodorus, but the question still remains open.

See T. Ashby in Papers of the British School at Rome, iii. 24.

ALLIANCE, a city of Stark county, Ohio, U. S. A., on the Mahoning river, about 57 m. S.E. of Cleveland, about 1080 ft. above the sea, and about 505 ft. above the level of Lake Erie. Pop. (1890) 7607; (1900) 8974, of whom 1029 were foreign-born: (1906, estimate) 9796. It is served by the Pennsylvania and the Lake Erie, Alliance & Wheeling railways, and by an electric line connecting with Canton and Salem. The city is the seat of Mount Union College (Methodist Episcopal), opened in 1846 as a preparatory school and having in 1907 a library of about 10,000 volumes, a collegiate department (opened in 1858), a normal department (1858), a school of music (1855), a commercial school (1868), a faculty of 29 teachers, and an enrolment of 524 students, of whom 274 were women. Among the manufactures of Alliance are structural iron, steel castings, pressed sheet steel, gun carriages, boilers, travelling cranes, pipe organs, street-car indicators, sashes and doors, and account registers and other material for file and cabinet-bookkeeping. The municipality owns and operates its water-works. Alliance was first settled in 1838, when it was laid out as a town and was named Freedom; it was named Alliance in 1851, was incorporated as a village in 1854, and became a city of the second class in 1888.

ALLIANCE, in international law, a league between independent states, defined by treaty, for the purpose of combined action, defensive or offensive, or both. Alliances have usually been directed to specific objects carefully defined in the treaties. Thus the Triple Alliance of 1688 between Great Britain, Sweden and the Netherlands, and the Grand Alliance of 1689 between the emperor, Holland, England, Spain and Saxony, were both directed against the power of Louis XIV. The Quadruple or Grand Alliance of 1814, defined in the treaty of Chaumont, between Great Britain, Austria, Russia and Prussia, had for its object the overthrow of Napoleon and his dynasty, and the confining of France within her traditional boundaries. The Triple Alliance of 1882 between Germany, Austria and Italy was ostensibly directed to the preservation of European peace against any possible aggressive action of France or Russia; and this led in turn, some ten years later, to the Dual Alliance between Russia and France, for mutual support in case of any hostile action of the other powers. Occasionally, however, attempts have been made to give alliances a more general character. Thus the ``Holy Alliance'' (q.v.) of the 26th of September 1815 was an attempt, inspired by the religious idealism of the emperor Alexander I. of Russia, to find in the ``sacred precepts of the Gospel'' a common basis for a general league of the European governments, its object being, primarily, the preservation of peace. So, too, by Article VI. of the Quadruple Treaty signed at Paris on the 20th of November 1815--which renewed that of Chaumont and was again renewed, in 1818, at Aix-la-Chapelle--the scope of the Grand Alliance was extended to objects of common interest not specifically defined in the treaties. The article runs:--``In order to consolidate the intimate tie which unites the four sovereigns for the happiness of the world, the High Contracting Powers have agreed to renew at fixed intervals, either under their own auspices or by their respective ministers, meetings consecrated to great common objects and to the examination of such measures as at each one of these epochs shall be judged most salutary for the peace and prosperity of the nations and the maintenance of the tranquillity of Europe.''

It was this article of the treaty of the 20th of November 1815, rather than the ``Holy Alliance,'' that formed the basis of the serious effort made by the great powers, between 1815 and 1822, to govern Europe in concert, which will be found outlined in the article on the history of Europe. In general it proved that an alliance, to be effective, must be clearly defined as to its objects, and that in the long run the treaty in which these objects are defined must---to quote Bismarck's somewhat cynical dictum --``be reinforced by the interests'' of the parties concerned. Yet the ``moral alliance'' of Europe, as Count Nesselrode called it, though it failed to secure the permanent harmony of the powers, was an effective instrument for peace during the years immediately following the downfall of Napoleon; and it set the precedent for those periodical meetings of the representatives of the powers, for the discussion and settlement of questions of international importance, which, though cumbrous and inefficient for constructive work, have contributed much to the preservation of the general peace (see EUROPE: History.) (W. A. P.)

ALLIARIA OFFICINALIS, also known botanically as Sisymbrium Alliaria, and popularly as garlic-mustard, Jack-by-the-hedge, or sauce-alone, a common hedge-bank plant belonging to the natural order Cruciferae. It is a rankly scented herb, 2 to 3 ft. high, with long-stalked, coarsely-toothed leaves, and small white flowers which are succeeded by stout long four-sided pods. It is widely spread through the north temperate region of the Old World.

ALLIBONE, SAMUEL AUSTIN (1816-1889), American author and bibliographer, was born in Philadelphia, Pennsylvania, on the 17th of April 1816, of French Huguenot and Quaker ancestry. He was privately educated and for many years was engaged in mercantile business in his native city. He, however, devoted himself chiefly to reading and to bibliographical research; acquired a very unusual knowledge of English and American literature, and is remembered as the compiler of the well-known Critical Dictionary of English Literature and British and American Authors (3 vols.: vol. i. 1854, vols. ii. and iii. 1871). To this, two supplementary volumes, edited by John Foster Kirk, were added in 1891. From 1867 to 1873, and again in 1877-1879, Allibone was book editor and corresponding secretary of the American Sunday School Union; and from 1879 to 1888 he was librarian of the Lenox Library, New York City. He died at Lucerne, Switzerland, on the 2nd of September 1889. In addition to his Critical Dictionary he published three large anthologies and several religious tracts.

See the ``Memoir'' by S. D. M`Connell, an address delivered before the Historical Society of Philadelphia (Philadelphia, 1890).

ALLIER (anc. Elaver), a river of central France flowing into the Loire. It rises in the department of Lozere, among the Margeride mountains, a few miles east of the town of Mende. The upper course of the Allier separates the mountains of the Margeride from those of the Velay and lies for the most part through deep gorges. The river then traverses the plains of Langeac and Brioude, and receives the waters of the Alagnon some miles above the town of Issoire. Swelled by torrents from the mountains of Dore and Dome, it unites with the river Dore at its entrance to the department to which it gives its name. It then flows through a wide but shallow channel, joining the Sioule some distance above Moulins, the chief town on its banks. It soon after becomes the boundary line between the departments of Cher and Nievre, and reaches the Loire 4 m. west of Nevers, after a course of 269 m. Its basin has an area of 6755 sq. m. The Allier is classed as navigable for the last 154 m. of its course, but there is little traffic on it.

ALLIER, a department of central France, formed in 1790 from the old province of Bourbonnais. Pop. (1906) 417,961. Area, 2849 sq. m. It is bounded N. by the department of Nievre, E. by Saone-et-Loire, from which it is divided by the river Loire, S.E. by Loire, S. by Puy-de-Dome, S.W. by Crouse and N.W. by Cher. Situated on the northern border of the Central Plateau, the department slopes from south to north. Its highest altitudes are found in the south-east, in the Bois-Noirs, where one point reaches 4239 ft., and in the Monts de la Madeleine. Plains alternating with forests occupy the northern zone of the department, while the central and western regions form an undulating and well-watered plateau. Entering the department in the south, and, like the other chief rivers, flowing almost due north, the Allier drains the central district, receiving on its left the Sioule. East of the Allier is the Bebre, which joins the Loire within the limits of the department; and on the west the Cher, with its tributary the Aumance. Rigorous and rainy in the south-east, the climate elsewhere is milder though subject to sudden variations. Agriculturally the department is flourishing, the valleys of the Allier and the Sioule known as the Limagne Bourbonnaise comprising its most fertile portion. Wheat, oats, barley and other cereals are grown and exported, and owing to the abundance of pasture and forage, sheep and cattle-rearing are actively carried on. Potatoes and mangels yield good crops. Wines of fair quality are grown in the valley of the Sioule; walnuts, chestnuts, plums, apples and pears are principal fruits. Goats, from the milk of which choice cheese is made, and pigs are plentiful. A large area is under forests, the oak, beech, fir, birch and hornbeam being the principal trees. The mineral waters at Vichy (q.v.), Neris, Theneuille, Cusset and Bourbon l'Archambault are in much repute. The mineral wealth of the department is considerable, including coal as well as manganese and bituminous schist; plaster, building stone and hydraulic lime are also produced. Manufactories of porcelain, glass and earthenware are numerous. Montlucon and Commentry are ironworking centres. There are flour mills, breweries and saw-mills; and paper, chemicals, wooden shoes, wool and woollen goods are produced. Besides the products of the soil Allier exports coal, mineral waters and cattle for the Paris market. Building materials, brandy and coal are among the imports. The railways belong chiefly to the Orleans and Paris-Lyons-Mediterranean companies. The lateral canal of the Loire, the Berry Canal and the canal from Roanne to Digoin together traverse about 57 m. in the department. Allier is divided into the arrondissements of Moulins, Gannat, Lapalisse and Montlucon (29 cantons, 321 communes). It forms the diocese of Moulins and part of the ecclesiastical province of Bourges, and falls within the academie (educational division) of Clermont-Ferrand and the region of the XIII. army-corps. Its court of appeal is at Riom. Moulins, the capital, Montlucon and Vichy, are the principal towns. Souvigny possesses the church of a famous Cluniac priory dating from the 1ith-12th and 15th centuries, and containing the splendid tombs (15th century) of Louis II. and Charles I. of Bourbon. At St Menoux, Ebreuil and Gannat there are fine Romanesque churches. Huriel has a church of the 11th century and a well-preserved keep, the chief survival of a medieval castle. St Pourcain-sur-Sioule has a large church, dating from the 11th to the 18th centuries. The castle of Bourbon l'Archambault, which belonged to the dukes of Bourbon, dates from the 13th and 15th centuries. The Romanesque churches of Veauce and Ygrande, and the chateaus of Veauce and Lapalisse, are also of interest, the latter belonging to the family of Chabannes.

ALLIES, THOMAS WILLIAM (1813-1903), English historical writer, was born at Midsomer Norton, near Bristol, on the 12th of February 1813. He was educated at Eton and at Wadham College, Oxford, of which he became a fellow in 1833. In 1840 Bishop Blomfield of London appointed him his examining chaplain and presented him to the rectory of Launton, Oxfordshire, which he resigned in 1850 on becoming a Roman Catholic. Allies was appointed secretary to the Catholic poor school committee in 1853, a position which he occupied till 1890. He died in London on the 17th of June 1903. Allies was one of the ablest of the English churchmen who joined the Church of Rome in the early period of the Oxford movement, his chief work, The Formation of Christendom (London, 8 vols., 1865-1895) showing much originality of thought and historical knowledge. His other writings: St Peter, his Name and Office (1852); The See of St Peter, the Rock of the Church (1850); Per Crucem ad Lucem (2 vols., 1879), have gone through many editions and been translated into several languages.

See his autobiography, A Life's Decision (1880); and the study of his daughier, Mary H. Allies, Thomas Allies, the Story of a Mind (London, 1906), which contains a full bibliography of his works.

ALLIFAE (mod. Alife), a town of the Samnites, 15 m. N.W. of Telesia, and 17 m. E.N.E. of Teanum. The site of the Samnite city, which in the 4th century B.C. had a coinage of its own, is not known; the Roman town lay in the valley of the Vulturnus, and its walls (4th century) enclose a circuit of 1 1/2 m., in which are preserved remains of large baths ( Thermae Herculis) and a theatre.

ALLIGATOR (Spanish el lagarto, ``the lizard''), an animal so closely allied to the crocodile that some naturalists have classed them together as forming one genus. It differs from the true crocodile principally in having the head broader and shorter, and the snout more obtuse; in having the fourth, enlarged tooth of the under jaw received, not into an external notch, but into a pit formed for it within the upper one; in wanting a jagged fringe which appears on the hind legs and feet of the crocodile; and in having the toes of the hind feet webbed not more than half way to the tips. Alligators proper occur in the fluviatile deposits of the age of the Upper Chalk in Europe, where they did not die out until the Pliocene age; they are now restricted to two species, A. mississippiensis or lucius in the southern states of North America up to 12 ft. in length, and the small A. sinensis in the Yang-tse-kiang. In Central and South America alligators are represented by five species of the genus Caiman, which differs from Alligator by the absence of a bony septum between the nostrils, and the ventral armour is composed of overlapping bony scutes, each of which is formed of two parts united by a suture. C. sclerops, the spectacled alligator, has the widest distribution, from southern Mexico to the northern half of Argentina, and grows to a bulky size. The largest, attaining an enormous bulk and a length of 20 ft., is the C. niger, the jacare-assu or large caiman of the Amazons. The names ``alligator'' and ``crocodile'' are often confounded in popular speech; and the structure and habits of the two animals are so similar that both are most conveniently considered under the heading CROCODILE.

ALLINGHAM, WILLIAM (1824-1889), Irish man of letters and poet, was born at Ballyshannon, Donegal, on the 19th of March 1824 (or 1828, according to some authorities), and was the son of the manager of a local bank. He obtained a post in the custom-house of his native town and filled several similar situations in Ireland and England until 1870, when he had retired from the service, and became sub-editor of Fraser's Magazine, which he edited from 1874 to 1879. He had published a volume of Poems in 1850, followed by Day and Night Songs, a volume containing many charming lyrics, in 1855. Allingham was on terms of close friendship with D. G. Rossetti, who contributed to the illustration of the Songs. His Letters to Allingham (1854-1870) were edited by Dr Birkbeck Hill in 1897. Lawrence Bloomfield, a narrative poem illustrative of Irish social questions, appeared in 1864. Allingham married in 1874 Helen Paterson, known under her married name as a water-colour painter. He died at Hampstead on the 18th of November 1889. Though working on an unostentatious scale, Allingham produced much excellent lyrical and descriptive poetry, and the best of his pieces are thoroughly national in spirit and local colouring.

William Allingham: a Diary (1907), edited by Mrs Allingham and D. Radford, contains many interesting reminiscences of Tennyson, Carlyle and other famous contemporaries.

ALLISON, WILLIAM BOYD (1829-1908), American legislator, was born at Perry, Ohio, on the 2nd of March 1829. Educated at Allegheny and Western Reserve Colleges, he studied law, and practised in Ohio until 1857. In that year he settled in Dubuque, Iowa, where he took a prominent part in Republican politics; and in 1860 he was a delegate to the national convention at Chicago which nominated Abraham Lincoln for the presidency. In 1861 he was appointed a member of the staff of Governor Samuel J. Kirkwood (1813-1894), and was of great service in the work of equipping and organizing the Iowa volunteers. From 1863 until 1871 he served with distinction in the House of Representatives; in 1873 he was elected to the United States Senate, and re-elected in 1878, 1884, 1890, 1896 and 1902. Here he became one of the highest authorities on questions connected with finance, and from 1877 he was a member of the Senate committee on finance. In 1881-1893, and again from 1895, he was chairman of the committee on appropriations, in which position he had great influence. He declined offers of the secretaryship of the treasury made to him by Presidents Garfield and Harrison. He was a prominent candidate for the presidential nomination in the Republican national conventions of 1888 and 1896. In 1892 he was chairman of the American delegation to the International Monetary Conference at Brussels. He died at Dubuque, Iowa, on the 4th of August 1908.

ALLITERATION (from Lat. ad, to, and littera, letter), the commencing of two or more words, in close juxtaposition, with the same sound. As Milton defined rhyme to be ``the jingling sound of like endings,'' so alliteration is the jingle of like beginnings. All language has a tendency to jingle in both ways, even in prose. Thus in prose we speak of ``near and dear,'' ``high and dry,'' ``health and wealth.'' But the initial form of jingle is much more common--``safe and sound,'' ``thick and thin,'' ``weal or woe,'' ``fair or foul,'' ``spick and span,'' ``fish, flesh, or fowl,'' ``kith and kin.'' The poets of nearly all times and tongues have not been slow to seize upon the emphasis which could thus be produced.

Although mainly Germanic in its character, alliteration was known to the Latins, especially in early times, and Cicero blames Ennius for writing ``O Tite tute, Tati, tibi tanta, tyranne, tulisti.'' Lucretius did not disdain to employ it as an ornament. We read in Shakespeare:-- ``Full fathom five thy father lies: Of his bones are corals made.'' In Pope:-- ``Here files of pins extend their shining rows, Puffs, powders, patches, bibles, billet-doux.', In Gray:-- ``Weave the warp and weave the woof, The winding-sheet of Edward's race.'' In Coleridge:- ``The fair breeze blew, the white foam flew, The furrow followed free: We were the first that ever burst Into that silent sea.'' Churchill describes himself, in his Prophecy of Famine, as one ``Who often, but without success, had prayed For apt alliteration's artful aid,''-- an example which is itself a proof of his failure; for alliteration is never effective unless it runs upon consonants.

As thus far considered, alliteration is a device wholly dependent on the poet's fancy. He may use it or not, or use it much or little, at his pleasure. But there is an extensive range of Teutonic poetry whose metrical laws are entirely based on alliteration. This, for example, is the principle on which Icelandic verse is founded; and we have a yet nearer interest in it, because it furnishes the key to Anglo-Saxon and a large portion of early English verse. For a specimen take the following lines, the spelling modernized, from the beginning of Piers the Plowman:-- ``But in a May morning | on Malvern hills, Me befel a ferly | of fairy methought; I was weary of wandering | and went me to rest Under a broad bank | by a burn-side; And as I lay and leaned | and looked on the waters, I slumbered in a sleeping | it sounded so merry.'' The rule of this verse is indifferent as to the number of syllables it may contain, but imperative as to the number of accented ones. The line is divided in the middle by a pause, and each half ought to contain two accented syllables. Of the four accented syllables, the first three should begin with the same letter; the fourth is free and may start with any letter. Those who wish for a more minute analysis of the laws of alliterative verse, as practised by the Anglo-Saxon and early English poets, may consult an exhaustive essay on the subject by Professor W. W. Skeat, prefixed to vol. iii. of Bishop Percy's Folio Manuscript; only the reader must be on his guard against an error which pervades it, and which this able writer seems to have derived from Rask. The question arises--What is the nature of the cadence in alliterative verse? Now all metrical movement is of two kinds, according as the beat or emphasis begins the movement or ends it. If the beat is initial, we say in classical language that the movement is trochaic or dactylic, according to the number of its syllables; and if the beat is final, we in like manner say that the movement is iambic or anapaestic. Skeat and many others object with some reason to use the classical terms, and therefore brushing them aside, let us put the question in the simplest form--Has the movement of alliterative verse got the initial or the final beat? In the middle of the 18th century Bishop Percy decided this question with sufficient accuracy, though he mixed up his statement with a blunder which it is not easy to account for. He points out how the poets began to introduce rhyme into alliterative verse, until at length rhyme came to predominate over alliteration, and ``thus was this kind of metre at length swallowed up and lost in the common burlesque Alexandrine or anapaestic verse, as ``A cobbler there was, and he lived in a stall.'' Percy made a serious mistake when he gave the name of Alexandrine to anapaestic verse; but he is quite right in his general statement that alliterative verse became lost in a measure the movement of which had the final beat. Conybeare has stated the fact still more accurately. ``In the Saxon poetry a trochaic character is predominant. In Piers the Plowman there is a prevailing tendency to an anapaestic cadence.'' It is the result of a change in the language--the loss of inflexion. Take the word man. The genitive in Saxon would be mannes, a trochee; in English, of man, an iambus. The tendency of the language was thus to pass from a metrical movement, in which the beat was initial, to one in which it was final. It may therefore be quite right to speak of Anglo-Saxon alliterative poetry as trochaic or dactylic, and quite wrong to apply the same terms to the cadence of our later alliterative verse. And this is precisely the error into which Skeat has fallen. He says--``Lines do not always begin with a loud syllable, but often one or two and sometimes (in early English especially) even three soft syllables precede it. These syllables are necessary to the sense, but not to the scanision of the line.'' That is just the point at issue. By leaving out of account the light syllable or syllables at the beginning of a line, and taking his start from the first syllable that has the alliterative beat, Skeat may certainly prove that all the later alliterative poetry has a movement of initial beat. But English ears will not submit to this rule. It is those light syllables of no account which have altered the rhythm of English descant from one of initial to one of final beat.

ALLIUM (Lat. for ``garlic''), a genus of plants, natural order Liliaceae, with about 250 species (seven of which occur in Britain), found in Central and South Europe, North Africa, the dry country of West and Central Asia, and North and Central America. The plants are bulbous herbs, with flat or rounded radical leaves, and a central naked or leafy stem, bearing a head or umbel of small flowers, with a spreading or bell-shaped white, pink, red, yellow or blue perianth. Several species afford useful foods, such as onion (Allium Cepa), leek (A. Porrum), shallot or eschallot (A. ascalonicum), garlic (A. sativum), and chives (A. schoenoprasum.) A few species are cultivated as border plants; such are A. Moly, an old garden plant with bright yellow flowers, and A. neapolitanum, the well-known white-flowered species, both natives of southern Europe.

ALLIX, PIERRE (1641-1717), French Protestant divine, was born at Alencon. He was pastor first at St Agobile in Champagne, and then at Charenton, near Paris. The revocation of the edict of Nantes in 1685 compelled him to take refuge in London, where, under the sanction of James II., he opened a church for the French exiles. His reputation for learning was such as to obtain for him, soon after his arrival, the degree of doctor of divinity from both universities, and in 1690 he received from Bishop Burnet the more substantial honour of the treasurership and a canonry in Salisbury Cathedral. He died at London in March 1717. The works of Allix, which are numerous, are chiefly of a controversial and apologetic character, and must be used with caution. In opposition to Bossuet he published Some Remarks upon the Ecclesiastical History of the Ancient Churches of Piedmont (1690), and Remarks upon the Ecclesiastical History of the Ancient Churches of the Albigenses (1692), with the idea of showing that the Albigenses were not Manichaeans, but historically identical with the Waldenses.

ALLMAN, GEORGE JAMES (1812-!898), British biologist, was born in Cork, Ireland, in 1812, and received his early education at the Royal Academical Institution, Belfast. For some time he studied for the Irish bar, but ultimately gave up law in favour of natural science. In 1843 he graduated in medicine at Dublin, and in the following year was appointed professor of botany in that university, succeeding his namesake, William Allman (1776-1846). This position he held for about twelve years until he removed to Edinburgh as regius professor of natural history. There he remained till 1870, when considerations of health induced him to resign his professorship and retire to Dorsetshire, where he devoted himself to his favourite pastime of horticulture. The scientific papers which came from his pen are very numerous. His most important work was upon the gymnoblastic hydrozoa, on which he published in 1871-1872, through the Ray Society, an exhaustive monograph, based largely on his own researches and illustrated with drawings of remarkable excellence from his own hand. Biological science is also indebted to him for several convenient terms which have come into daily use, e.g. endoderm and ectoderm for the two cellular layers of the body-wall in Coelenterata. He became a fellow of the Royal Society in 1854, and received a Royal medal in 1873. For several years he occupied the presidential chair of the Linnaean society, and in 1879 he presided over the Sheffield meeting of the British Association. He died on the 24th of November 1898 at Parkstone, Dorsetshire.

ALLOA, a municipal and police burgh and seaport of Clackmannanshire, Scotland. It is situated on the north bank of the Forth, 32 m. from Edinburgh by the North British railway via the Forth Bridge, and 28 m. from Leith by steamer. Pop. (1891) 12,643; (1901) 14,458. The Caledonian railway enters the town from the south-west by a bridge across the river, and also owns a ferry to South Alloa, on the opposite shore, in Stirlingshire. Between Alloa and Stirling the stream forms the famous ``links,'' the course being so sinuous that whereas by road the two towns are but 6 1/2 m. apart, the distance between them by river is nearly 12 m.

For its size and population the town enjoys unusual prosperity, in consequence of its several flourishing industries. Its manufactures of yarn are on the largest scale, the spinning mills often working night and day for many months together. There are also numerous breweries, and Alloa ale has always been famous. The great distillery at Carsebridge yields an immense supply of yeast as well as whisky. Other thriving trades include the glass-works on the shore, pottery-works in the ``auld toon,'' dye-works and a factory for the making of electrical appliances. There is a good deal of shipbuilding, some ironfounding and a brass foundry. The chief article of export is coal from the neighbouring collieries, the other leading exports being ale, whisky, glass and manufactured goods. The imports comprise timber, grain, iron, linseed and flax. The docks, accessible only at high water, include a wet basin and a dry dock. Amongst the principal buildings are the fine Gothic parish church, with a spire 200 ft. high; the town hall, including the free public library, from designs by Alfred Waterhouse, R.A., the gift of Mr J. Thomson Paton; the county and municipal buildings; handsome public baths and gymnasium, presented to the town by Mr David Thomson; the accident hospital; the fever hospital; the museum of the Natural Science and Archaeological Society; the academy, the burgh school and a secondary school with the finest technical equipment in Scotland, given by Mr A. Forrester Paton. There is a public park, besides bowling-greens and cricket and football fields. The old burying-ground was the kirkyard of the former parish church, the tower of which still exists, but a modern cemetery has been formed in Sunnyside. The town owns the water-supply, gas-works and electric-lighting.

Alloa Park, the seat of the earl of Mar and Kellie, is in the immediate vicinity, and in its grounds stand the ruins of Alloa Tower, an ancient structure 89 ft. high, with walls 11 ft. thick, which was built about 1315, and was once the residence of the powerful family of Erskine, descendants of the earl of Mar. The earl who promoted the Jacobite rising in 1715 was born here. Many of the Scots princes received their education as wards of the Lords Erskine and the earls of Mar, the last to be thus educated being Henry, the eldest son of James VI.

ALLOBROGES (in Gr. usually 'Allobriges), a Celtic tribe in the north of Gallia Narbonensis, inhabiting the low ground called the ``island'' between the Rhodanus, the Isara and the Graian Alps, corresponding to the modern Dauphine and Savoy. If the name is rightly interpreted as meaning ``aliens,'' they would seem to have driven out the original inhabitants. Their chief towns were Vienna (Vienne), Genava (Geneva) and Cularo (afterwards Gratianopolis, whence Grenoble). The Allobroges first occur in history as taking part with Hannibal in the invasion of Italy. After the subjugation of the Salluvii (Salyes) by the Romans in 123 B.C., having given shelter to their king Tutomotulus and refused to surrender him, the Allobroges were attacked and finally defeated (August 8, 121) at the junction of the Rhodanus and Isara by Q. Fabius Maximus (afterwards Allobrogicus). But they still remained hostile to Rome, as is shown by the conduct of their ambassadors in the Catilinarian conspiracy (63; see CATILINE); two years later a revolt under Catugnatus was put down by Gaius Pomptinus at Solonium. Under Augustus they were included in Gallia Narbonensis; later, in the Viennensis.

See A. Desjardins, Geographie historique de la Gaule romaine, ii. (1876-1893); . E. Herzog, Galliae Narbonensis Historia (Leipzig, 1864); Mommsen, Hist. of Rome (Eng. trans.). bk. iii. ch. 4, iv. ch. 5; T. R. Holmes, Caesar's Conquest of Gaul (1899): G. Long in Smith's Dict. of Greek anid Roman Geography: M. Ihm in Pauly-Wissowa's Realencyclopadie, i. 2 (1894); A. Holder, Alt-celtischer Sprachschatz; and bibliography in La grande encyclopedie (s.v.).

ALLOCATUR (from med. Lat. allocatur, it is allowed), in law, a certificate given by a taxing master, at the termination of an action, for the allowance of costs.

ALLOCUTION (Lat. allocutio, an address), a name given to the formal addresses made by the pope to the College of Cardinals and through them to the church generally. They are usually called forth by ecclesiastical or political circumstances, and aim at safeguarding papal principles and claims. They are published by being affixed to the door of St Peter's Church.

ALLODIUM, or ALODIUM, a legal term for lands which are the absolute property of their owner, and not subject to any service or acknowledgment to a superior. It is thus the opposite of fe-odum or fief. The proper derivation of the word has been much discussed and is still doubtful, though it is probably compounded of all, whole or entire, and odh, property. Allodial tenure seems to have been common throughout northern Europe. It exists in Orkney and Shetland, but is unknown in England, the feudal system having been made universal by William the Conqueror.

ALLOMEROUS (Gr. allos, other meros, part), the quality of bodies (e.g. mineral) by virtue of which they can change their elements and proportions while preserving their form.

ALLON, HENRY (1818-1892), English Nonconformist divine, was born on the 13th of October 1818 at Welton near Hull in Yorkshire. Under Methodist influence he decided to enter the ministry, but, developing Congregational ideas, was trained at Cheshunt College. In 1844 he became co-pastor with the Rev. Thomas Lewis of Union Chapel, Islington. In 1852, on the death of Lewis, Allon became sole pastor, and this position he held with increasing influence till his death in 1892. Union Chapel, originally founded by evangelical members of the Church of England and Nonconformists acting in harmony, became during Anon's co-pastorate definitely Congregational in principle and fellowship, and exercised an ever-expanding influence. His chief service to Nonconformity was in connexion with the improvement of congregational worship, and especially the service of praise. In 1852 Dr. H. J. Gauntlett became organist at Union of this class, Allon published the original edition of his well-known Congregational Psalmist. For many years his collection of hymns, chants and anthems was used in hundreds of churches throughout England. In 1860 Allon began to write, at first chiefly for the Patriot, then under the editorship of T. C. Turbeville. In 1864, at the age of forty-five, he was elected chairman of the Congregational Union, and in 1866 he undertook the editorship of the British Quarterly Review with H. R. Reynolds, the principal of Cheshunt. In 1877 he became sole editor, and in that capacity came into touch with such men as W. E. Gladstone, Matthew Arnold, F. D. Maurice and Dean Stanley. The magazine was discontinued in 1886. In 1871 he received the degree of D.D. from the university of Yale, U.S.A. In 1874 the congregation at Islington decided to erect new buildings. The church, which was built at a cost of L. 50,000, was specially adapted for congregational worship and was mentioned by an architectural journal as one of the hundred remarkable buildings of the century. The church had in its Yarious departments about 300 teachers in charge of more than 3000 children, and was in its organization one of the earliest instances of the type known as the institutional church. In 1881. on the occasion of the jubilee of the Congregational Union of England and Wales, Allon was again elected chairman. In were A Memoir of James Sherman (1863); the Sermons of Thomas Binney, with a biographical and critical sketch (1869); The Vision of God and other sermons (1876); The Indwelling Christ (1892). Allon was a man of sound judgment, strong will, great moral courage and personal kindness. His acquaintance with literature was wide, his own style lucid and decisive. In social and political affairs he was a convinced individualist. Both as leader of Union Chapel and in denominational affairs his courage and discretion, his simple faith, combined with a broad-minded symoathy with the intellectual movements of the time, made his ministry a widespread influence for good. (D. MN.)

ALLONGE (from Fr. alloinger, to draw out), a slip of paper affixed to a negotiable instrument, as a bill of exchange, for the purpose of receiving additional indorsements for which there may not be sufficient space on the bill itself. An indorsement written on the allonge is deemed to be written on the bill itself. An allonge is more usually met with in those countries where the Code Napoleon is in force, as the code requires every indorsement to express the consideration. Under English law, as the simple signature of the indorser on the bill, without additional words, is sufficient to operate as a negotiation, an allonge is seldom necessary.

ALLOPHANE, one of the few minerals known only in the amorphous state. It is a glassy substance, usually occurring as thin encrustations with a mammillary surface; occasionally, however, it is earthy and pulverulent. The colour varies considerably. from colourless to yellow, brown, blue or green. Specimens of a brilliant sky-blue colour, such as those found formerly in Wheal Haniblyn, near Bridestowe in Devonshire, and in Sardinia, are specially attractive in appearance; the colour is here due to the presence of the copper mineral chrysocolla. The hardness is 3, and the specific gravity 1.9. Chemically, it is a hydrous aluminium silicate, Al2SiO5.5H2O. Allophane is always of secondary origin, resulting from the decomposition of various aluminous silicates, such as felspar. It is often found copper and iron. It was first observed in 1809 in marl at Grafenthal, near Saalfield in Thuringia; and has been found in lines fissures and funnel-shaped cavities. The name allophane was given by F. Stromeyer in 1816, from the Gr. allos, another, and faino, to appear, in allusion to the fact that the mineral crumbles and changes in appearance when heated before the blowpipe. Other names for the species are riemannite and elhuyarite, whilst closely allied minerals are carolathine, samoite and schrotterite (opal-allophane).

ALLORI, ALESSANDRO (1535--1607), Italian painter of the Florentine school, was brought up and trained in art by his uncle, Angelo Bronzino (q.v.) whose name he sometimes assumed in his pictures. Visiting Rome in his nineteenth year, he carefully studied the works of Michelangelo; but the influence of that great master can only be traced in the anatomical correctness of his drawing of nude figures. He was successful as a portrait painter. His son CRISTOFANO ALLORI (1577-1621), born at Florence, received his first lessons in painting from his father, but becoming dissatisfied with the hard anatomical drawing and cold colouring of the latter, he entered the studio of Gregorio Pagani (1558-1605) who was one of the leaders of that later Florentine school which endeavoured to unite the rich colouring of the Venetians with the correct drawing of Michelangelo's disciples. Allori became one of the foremost of this school. His pictures are distinguished by their close adherence to nature and the delicacy and technical perfection of their execution. His technical skill is proved by the fact that several copies he made after Correggio have been taken to be duplicates by Correggio himself. His extreme fastidiousness limited his power of production, though the number of his works is not so small as is sometimes asserted. Several specimens are to be seen at Florence and elsewhere. The finest of all his works is his ``Judith and Holofernes,'' in the Pitti Palace. The model for the Judith was his mistress, the beautiful Mazzafirra, who is also represented in his Magdalene; and the head of Holofernes is generally supposed to represent himself.

ALLOTMENT from O. Fr. a and loter, to divide by lot), the act of allotting; a share or portion assigned. In England, the term denotes a portion of land assigned on partition or under an inclosure award (see COMMONS); also a division of land into small portions for cultivation by a labourer or artisan at a small rent (see ALLOTMENTS AND SMALL HOLDINOS). In company law, ``allotment'' is the appropriation to an applicant by a resolution of the directors of a certain number of shares in response to an application. The document sent to such an applicant, which announces the number of shares assigned and concludes the contract, is called a letter of allotment or allotment certificate. A letter of allotment in England requires a sixpenny stamp if the value of the shares amounts to L. 5 or over, and a penny stamp if less than L. 5. (See COMPANY.)

Allotment note is a writing by a seaman authorising his employers to make an allotment of part of his wages, while he is on a voyage, in favour either of a ``near'' relative (wife, father, mother, grandfather, grandmother, child, grandchild, brother or sister of the seaman), or of a savings bank. Every allotment note must be in a form sanctioned by the Board of Trade.

ALLOTMENTS AND SMALL HOLDINGS. As the meaning of these terms in agricultural tenure varies in different localities, it may be as well to say at once that for the present purpose they are definable as pieces of land detached from cottages, and hired or owned by labouring men to supplement their main income. We do not include any farm, however small, from which the occupier derives his entire support by dairying, market-gardening, or other form of la petite culture. So, also, no account is taken of the tiny garden plot, used for growing vegetables for the table and simple flowers, which is properly an appurtenance of the cottage. Clearing away what is extraneous, the essential point round which much controversy has raged is the labourer's share in the land. The claim advanced depends upon tradition. In agriculture, the oldest of all industries, a cash payment is not even now regarded as discharging the obligations between master and servant. Mr Wilson Fox, in reporting to the Board of Trade on the earnings of agricultural labourers in Great Britain, gives, as a typical survival of an old custom, the case of a shepherd whose total income was calculated at L. 60 a year, but who got only L. 16 in money, the rest being made up by rights of grazing live-stock, growing crops on his master's land, and kindred privileges. That is exactly in the spirit that used to pervade agriculture, and doubtless had its origin in the manorial system. If we turn back to the 13th century, from Walter of Henley's Husbandry it will be seen that practically there were only two classes engaged in agriculture, and corresponding with them were two kinds of land. There were, on the one hand, the employer, the lord, and his demesne land; on the other, the villeins and the land held in villenage. Putting aside for the moment any discussion of the exact degree of servitude, it will be seen that the essence of the bargain was that the villein should be permitted to cultivate a virgate of land for his own use in return for service rendered on the home farm. This is not altered by the fact that the conditions approached those of slavery, that the villeins were adscripti glebae, that in some cases their wives and sons were bequeathed by deed to the service of religious houses, and that in many other respects their freedom was limited. Out of this, in the course of centuries, was developed the system prevailing to-day. Lammas lands are indeed a survival from it. There are in the valley of the Lea, and close to London, to take one example, lands allotted annually in little strips till the crops are carried, when, the day being fixed by a reeve, the land becomes a common pasture till the spring closing takes place once more. Perhaps the feature of this old system that bears most directly on the question of allotments was the treatment of the waste of the manor. The lord, like his tenants, was limited by custom as regards the number of beasts he could graze on it. After the havoc of the Black Death in 1349, many changes were necessitated by the scarcity and dearness of labour. It became less unusual for land to be let and for money payment to be accepted instead of services. There was a great demand for wool, and to conduct sheep-farming on a large scale necessitated a re-arrangement of the manor and the enclosure of many common fields under the statute of Merton and the statute of Westminster the Second. Nevertheless, up to the 18th century, a vast proportion of agricultural land was technically waste, on which rights of common were exercised by yeomen, some of whom had acquired holdings by the ordinary methods of purchase or inheritance, while others had merely squatted and built a house on the waste. It is to this period that belongs a certain injustice to which the peasantry were subject. No reasonable doubt can be entertained of the necessity of enclosure. Husbandry, after long stagnation, was making great advance; and among others, Arthur Young raised his voice against the clumsy inconvenient common fields that were the first to be enclosed. Between 1709 and 1797 no fewer than 3110 acts, affecting, as far as can be calculated, about 3,000,000 acres, were put into operation. They seem mostly to have been directed to the common fields. In the first half of the 19th century the movement went on apace. In a single year, 1801, no fewer than 119 acts were passed; and between 1801 and 1842 close on 2000 acts were passed---many of them expressly directed to the enclosure of wastes and commons. The same thing continued till 1860. It touched the peasant directly and indirectly. The enclosure of the common fields proved most hurtful to the small farmer; the enclosure of the waste injured the labourer by depriving him, without adequate compensation, of such useful privileges as the right to graze a cow, a pig, geese or other small animals. It also discouraged him by tending to the extinction of small tenancies and freeholds that were no longer workable at a profit when common rights ceased to go with them. The industrious labourer could previously nourish a hope of bettering his condition by obtaining a small holding. Yet though the labourer suffered, impartial study does not show any intentional injustice. He held a very weak position when those interested in a common affixed to the church door a notice that they intended to petition. As Mr Cowper (afterwards Lord Mount Temple) said in the House of Commons on the 13th of March 1844, ``the course adopted had been to compensate the owner of the cottage to whom the common right belonged, forgetting the claims of the occupier by whom they were enjoyed''; and in the same debate Sir Robert Peel pointed out that not only the rights of the tenant, but those of his successors ought to have been studied. The course adopted divorced the labourer from the soil.

Parliament, as a matter of fact, had from a very early period recognized the wisdom of contenting the peasant. In the 14th century the labourer lived in rude abundance. Next century a rural exodus began, owing to the practice of enclosing the holdings and turning them into sheep walks. In 1487 an act was passed enjoining landlords to ``keep up houses of husbandry,'' and attach convenient land to them. Within the next hundred years a number of similar attempts were made to control what we may call the sheep fever of the time. Then we arrive at the reign of Elizabeth and the famous Small Holdings Act passed in 1597--an anticipation of the three-acres-and-a-cow policy advocated towards the end of the 19th century. It required that no person shall ``build, convert or ordain any cottage for habitation or dwelling for persons engaged in husbandry'' unless the owner ``do assign and lay to the same cottage or building four acres of ground at the least.'' It also provided against any ``inmate or under-sitter'' being admitted to what was sacred to one family. This measure was not conceived in the spirit of modern political economy, but it had the effect of staying the rural exodus. It was repealed in 1775 on the ground that it restricted the building of cottages. By that time the modern feeling in favour of allotments had begun to ripen, and it was contended that some compensation should be made to the labourers for depriving them of the advantages of the waste. Up to then the English labouring rustic had been very well off. Food was abundant and cheap, so were clothes and boots; he could graze his cow or pig on the common, and also obtain fuel from it. Now he fell on evil days. Prices rose, wages fell, privileges were lost, and in many cases he had to sell the patch of land whose possession made all the difference between hardship and comfort. All this was seen plainly enough both by statesmen and private philanthropists. One of the first experiments was described by Sir John Sinclair in a note to the report of a select committee of the House of Commons on waste lands in 1795. About 1772 the lord of the manor of some commonable lands near Tewkesbury had with great success set out 25 acres in allotments for the use of some of the poor. Sir John was very much struck with the result, and so heartily applauded the idea that the committee recommended that any general enclosure bill should have a clause in it providing for ``the accommodation of land.'' Sir Thomas Bernard and W. Wilberforce took an active part in advocating the principle of allotments, on the ground, to summarize their argument in language employed later by a witness before the House of Commons, that ``it keeps the cottagers buoyant and makes them industrious.'' In 1806, at the suggestion of the rector, a clause assigning an allotment of half an acre to every cottage was inserted in an enclosure bill Wiltshire. This was done, ``and the example was followed by nearly every adjoining parish in that part of Wiltshire. Passing over several praiseworthy establishments of allotments by private persons, we come to 1819, when parliament passed an act akin in spirit to several that came into existence during the later portion of the Victorian era. It empowered the churchwardens and overseers of any parish, with the consent of the vestry, to purchase or hire land not exceeding 25 acres, and to let it in portions to ``any poor and industrious inhabitant of the parish.'' This was amended in 1831 by an act extending the quantity of land enable the same authorities to enclose from any waste or common, land not exceeding 50 acres to be devoted to the same purpose. This was followed next year by an act relating to fuel, and in 1834 the Poor Law Commissioners reported favourably on the principle of granting allotments. In 1843 an important inquiry into the subject was made by a committee of the House of Commons, which produced a number of valuable suggestions. One consequence was the bill of 1845, brought into parliament by Mr Cowper. It passed the House of Commons; and there Mr Bright made a remark that probably summarized a general opinion, since it never came to a third reading in the House of Lords. He said that ``the voluntary system of arrangement would do all the good that was expected to accrue from the allotment system.''

At this point in the history of the movement it may be as well to cause and ask what was the net result of so much legislation and benevolent action. Messrs Tremenheere and Tufnall, who prefixed an admirable epitome of what had been done to the report of the commission ``appointed to inquire into the employment of women, young persons and children in agriculture'' (1867), expressed considerable disappointment. Between 1710 and 1867, 7,660,413 statute acres were added to the cultivated area of England and Wales, or about one-third of the area in cultivation at the latter date; and of this total, 484,893 acres were enclosed between 1845 and 1867. Of the latter, only 2119 acres were assigned as public allotments for gardens to the labouring poor. It was found to be the case, as it is now, that land was taken up more readily when offered privately and voluntarily than when it came through offcial sources. Meanwhile competent and thoughtful men saw well that the sullen discontent of the peasantry continued, in Lord Bacon's phrase, to threaten ``the might and manhood of the kingdom.'' It had existed since the beginning of the Napoleonic wars, and had become more articulate with the spread of education. We shall see a consciousness of its presence rehected in the minds of statesmen and politicians as we briefly examine the later phase of the movement. This found expression in the clauses against enclosure introduced by Lord Beaconsheld in 1876, and gave force to the three-acres-and-a-cow agitation, of which the more prominent leaders were Joseph Arch and Jesse Collings. In 1882 the Allotments Extension Act was passed, the object of which was to let the parishioners have charity land in allotments, provided it or the revenue from it was not used for apprenticeshio, ecclesiastical or educational purposes. A committee of the House of Commons, appointed in 1885 to inquire into the housing of the working classes, reported strongly in favour of allotments, and this was followed in 1887 by the Allotments Act---the first measure in which the principle of compulsory acquisition was admitted in regard to other than charity lands. Its administration was first given to the sanitary authority, but passed to the district councils when these bodies were established in 1894. the local body is empowered to hire or purchase suitable land, and if they do not find any in the market they are to petition the county council, which after due inquiry may issue a provisional order compeihng owners to sell land, and the Local Government Board may introduce a bill into parliament to confirm the order. It was found that the sanitary authority did not carry out the scheme, and in 1890 another act was passed for the purpose of allowing applicants for allotments, when the sanitary authority failed to provide land, to appeal to the county council. Judging from the evidence laid before the commission on agricultural depression (1894), the act of 1887 was not a conspicuous success. Most of the witnesses reported in such terms as these---``the Allotments Act has been quite inoperative in Cornwall''; ``the act has been a dead letter in the district (Wigtownshire)''; ``the Allotments Act has not been in operation in Flintshire''; ``nothing has been done in the district of Pembrokeshire under the act.'' No evidence whatever was adduced to show that in a single district a different state of things had to be recorded. From a return presented by the Local Government Board to parliament in 1896 we learn that eighty-three rural sanitary authorities had acquired land for allotment prior to the 28th of December 1894, the date at which these authorities ceased to exist under the provisions of the Local Government Act 1894. Land was acquired by compulsory purchase in only one parish; by purchase or agreement in eighteen parishes; by hire by agreement in 132 parishes. The total acreage dealt with was 1836 acres 1 rood 34 poles, and the total number of tenants 4711. The number of county councils that up to the same date had acquired land was twelve, and they had done so by compulsory purchase in one parish, by purchase or agreement in five parishes, by hire by agreement in twenty-four parishes. The total area dealt with was only 413 acres 1 rood 5 poles, and the total number of tenants 825.The complete totals affected at the date of the return (August 21, 1895) by the acts, therefore, were 2249 acres 2 roods 29 poles, and 5536 tenants. A considerable extension has taken place since.

The Small Holdings Act introduced by Mr Henry Chaplin, and passed by parliament in 1892 was an attempt to appease the rural discontent that had been seething for some time past and was silently but most eloquently expressed in a steady migration from the villages. The object of this measure was to help the deserving labouring man to acquire a small holding, that is to say, a portion of land not less than one acre or more than fifty acres in extent and of an annual value not exceeding L. 50. It is not necessary here to describe the legal steps by which this was to be accomplished. The essence of the bargain was that a fifth of the purchase money should be paid down, and the remainder in half-yearly instalments spread over a period not exceeding fifty years. But if the local authority thought fit a portion of the purchase money, not exceeding one-fourth. might remain unpaid, and be secured by a perpetual rent charge upon the holding. It cannot be said that this act has attained the object for which it was drawn up. From a return made to the House of Commons in 1895 it was shown that eight county councils had acquired land under the Small Holdings Act, which amounted in the aggregate to 483 acres. A further return was made in 1903, which showed that the total quantity of land acquired from the commencement of the act up to the end of 1902 was only 652 acres.

It is, however, an English characteristic to prefer private to public arrangements, and probably a very great majority of the allotments and small holdings cultivated in 1907 were due to individual initiative. There are no means of arriving at the exact figures, but data exist whereby it is at least possible to form some rough idea of them. It is not the custom to give in the annual agricultural returns any statement of the manner in which land is held, and the information is to be found in the returns presented to parliament from time to time. From the following table, which includes both the holdings owned and tenanted, it will be seen that between 1895 and 1904 the tendency was for the holdings to decrease in number; while the holdings of from 50 to 300 acres slightly increased, those from 5 to 50 acres were almost stationary, and there was a decrease in those between 1 and 5 acres.

1895. 1904. Number. Per cent. Number. Per cent. 1 to 5 acres 117,968 22.68 110,974 21.69 5 to 50 '' 235,481 45.28 232,470 45.44 50 to 300 '' 147,870 28.43 150,050 29.33 Above 300 '' 18,787 3.61 18,084 3.54

These figures become doubly instructive when considered in connexion with the decline of the strictly rural population. It will, therefore, be useful to place beside them a summary published in a report on the decline of rural population in Great Britain issued by the Board of Agriculture and Fisheries in 1906.

Class. 1881. 1891. 1901. Increase (+) or Decrease (-) 1881-1891. 1891-1901. No. No. No. No. No. Farmers and Graziers 279,126 277,943 277,694 -1,183 -249 Farm Bailiffs and Foremen 22,895 21,453 27,317 -1,442 +5,864 Shepherds 33,125 31,686 35,022 -1,439 +3,336 Agricultural Labourers 983,919 866,543 689,292 -117,376 -177,251

These figures must of course be approximate. The effect of recent development in methods of travelling and the growing custom for townsmen either to live wholly in the country or to take week-end cottages, has made it impossible to draw a strict line of demarcation between rural and urban populations. Still they are near enough for practical purposes, and they amply justify the efforts of those who are trying to stay the rural exodus.

While legislation had not, up to 1908, achieved any noteworthy result in the creation of small holdings, and still left doubts as to the practicability of re-creating the English yeoman by act of parliament, many successful efforts have been made by individuals. One of the most interesting is that of the earl of Carrington at Sleaford in Lincolnshire. In this case the most noteworthy feature is that between the landlord and the tenants there is a body called the South Lincolnshire Small Holdings Association, which took 650 acres from Lord Carrington on a twenty years' lease. These acres used to be let to four or five tenants. They were in 1905 divided among one hundred and seventy tenants. The Small Holders' Association guaranteed the rent, which works out at about 33s. per acre, to Lord Carrington. They let the men on yearly tenancy have it at about 40s. an acre, the difference being used to meet the expenses of dividing the lands into small holdings, maintaining drains, fences and roads connected with them, and other unavoidable outlays. In this way the landlord is assured of his rent, and the association has lost nothing, as the men were very punctual in their payments. But very great care was bestowed in choosing the men for the holdings. They were in a sense picked men, but men must be picked to work the business satisfactorily. Lincolnshire is pre-eminently a county of small holdings, and the labouring residents in it have been accustomed to the management of them from their infancy onwards. Here as elsewhere the provision of suitable houses formed a difficulty, some of the tenants having to walk several miles to their holdings. Lord Carrington availed himself as much as possible of the buildings that existed, dividing the old farm houses so as to make them suitable for the small tenants. At Cowbit farm, many of the ordinary labourers' cottages, which were put up at a cost of about L. 300 a pair, have by the addition of little dairies and other alterations been made suitable for the tenants. From facts collected on the spot we have come to the conclusion that on the small holdings a good tenant makes an average profit of about L. 4 an acre, but on an allotment cultivated by means of the spade it would probably be at the rate of over L. 6 an acre. Lord Carrington was also successful in establishing small holdings on the Humberston estate in North Lincolnshire and on his Buckinghamshire estate, near Aylesbury. At Newport Pagnell the attempt failed because the demand was artificial, the ground arable, and the men not capable of dealing with it.

Other examples of the establishment of small holdings can only receive brief reference. The Norfolk Small Holdings Association acquired three farms at Whissonsett, Watton and Swaffham, which are broken up into small lots and let mostly to the village tradespeople. Sir Pearce Edgecumbe established small holdings at Rew, some of which have been purchased by the occupiers, and Mr A. B. Markham created similar ownerships at Twyford (Leicestershire) . At Cudworth in Surrey a group was formed, but the owners were actuated more by the desire to lead a simple life than to prove the remunerative value of small holdings. Mr W. J. Harris created small holdings in Devon, each of which is let on a life tenancy. There the rural exodus has been more than arrested. Mr James Tomkinson established in Cheshire a number of graduated holdings, so contrived as to offer the successful holders a chance of stepping upwards.

The earl of Harrowby made an interesting experiment on his Sandon estate in Staffordshire in the midst of a pretty, broken and undulating country. The estate consists of about 6000 acres, one-third of which is laid out in small holdings. These fall naturally into three divisions. First, there are those which belong to men who have regular employment, and would therefore find it impossible to cultivate any great quantity of land. Many of that class are anxious to have a holding of some sort, as it lends a certain elasticity to their incomes and provides them with a never-failing interest. One who may be taken as typical hired six acres with a good cottage and a large garden, paying a rent of L. 20 a year. When this holding was created it had already a suitable cottage, but L. 100 was needed to provide outbuildings, and Lord Harrowby's custom is to charge 5% on outlay of this kind. This L. 5, however, is included in the total rent of L. 20 paid for cottage, land and garden. The man was not only content, but wished to get some more land. The next class consists of those who have not enough land to live on but eke out their livelihood by casual labour. Usually a man of this sort requires from 35 to 50 acres of land mostly pasture. He can attend to it and yet give a certain number of days to estate work. The third class is that of the small farmer who gains his entire livelihood from the land. The obstacle to breaking up large farms into small lies of course in the expense of providing the necessary equipment. It has been found here that a cottage suitable for a small farmer costs about L. 400 to build in a substantial manner, and the outbuildings about L. 200. This makes an addition therefore of about L. 30 to the rent of the land. The ardour with which these tenancies were sought when vacant formed the best testimony to the soundness of the principle applied by Lord Harrowby.

A nest of small holdings was created at Winterslow, near Salisbury, by Major R. M. Poore. The holders completed the purchase by 1906, and the work may be pronounced a complete success. Major Poore originally conceived the idea when land was cheap in 1892, owing to the depression in agriculture. He purchased an estate that came into the market at the time. The price came to an average of L. 10 an acre, and the men themselves made the average for selling it out again L. 15 on a principle of instalments. His object was not to make any profit from the transaction, and he formed what is termed a Landholders' Court, formed of the men themselves, every ten choosing one to represent them. This court was found to act well. It collected the instalments, which are paid in advance; and of course the members of it, down to the minutest detail, knew not only the circumstances but the character of every applicant for land. The result speaks for itself. The owners are, in the true sense of the word, peasants. They do not depend on the land for a living, but work in various callings---many being woodmen---for wages that average about 15s. a week. The holdings vary in size from less than an acre to ten acres, and are technically held on a lease of 1999 years, practically freehold, though by the adoption of a leasehold form a saving was effected in the cost of transfer. On the holdings most of the men have erected houses, using for the purpose chalk dug up from their gardens, it lying only a few inches below the surface. It is not rock, but soft chalk, so that they are practically mud walls; but being as a rule at least 18 inches thick, the houses are very cool in summer and warm in winter. Major Poore calculated that in seven years these poor people--there are not thirty of them altogether--managed to produce for their houses and land a gross sum of not less than L. 5000. This he attributed to the loyal manner in which even distant members of the family have helped.

The class of holding which owes its existence to the act of 1802 may be illustrated by the history of the Worcestershire small holdings. The inception of the scheme was due to the decline of the nail-making business, which caused a number of the inhabitants to be without occupation. Two candidates for election to the county council looking out for a popular cry found it in the demand for land. They promised to do their best in this direction, and thanks to the energetic action of Mr Willis Bund, the chairman, the act was put in force. Woodrow Farm, adjoining the village of Catshill in the neighbourhood of Birmingham, was purchased on terms that enabled the land to be sold to the peasant cultivator at L. 40 an acre. They were paying this back at the rate of 4% on the purchase money, a rate that included both interest and sinking fund, so that at the end of forty years they would own the small estates free from encumbrance. The huge population of Birmingham is close to the properties. The men turned their attention mostly to strawberries, to which many acres were devoted. Costermongers would come out from Birmingham and buy fruit on the spot, selling part of it to the villas on the way back, and part in the Birmingham market. The experience gained in working the act enabled the committee on small holdings to make a number of practical suggestions for future legislation.

It remains to note the passing in 1907 of a new English Small Holdings and Allotments Act, experience of which is too recent for its provisions to be more than indicated here. The act transferred to the Board of Agriculture the duties generally of the Local Government Board, and transferred to parish councils or parish meetings the powers and duties of rural district councils; it required county councils to ascertain the demand for land without previous representation to them, and gave power for its compulsary acquisition; and the maximum holding of an allotment was raised from one acre to five. Both compulsary purchase and compulsary hiring (for not less than 14 nor more than 35 years) were authorized, value and compensation begin decided by a single arbitrator. A coercive authority was applied to the county councils in the form of commissioners appointed by the Board of Agriculture, who were to hold inquiries independently and to take action themselves in the case of a defaulting county council. They were to ascertain the local demand for small holdings, and to report to the Board, who might then require a county council to prepare a scheme, whihc, when approved, it was to carry out, the commissioners begin empowered to do so in the alternative.

Foreign Countries.--It remains to give a brief outline of what small holdings are like outside Great Britain. From the results of the Belgian Agricultural Inquiry in 1895 the following table has been compiled, assuming that one hectare = 2 1/2 acres:--

Occupied by Owner. Occupied by Tenant. Total. Size of Holding Whole. More than Half. More than half. Whole. No. No. No. No. No. 1 1/4 acres and under 109,169 8,759 34,779 305,413 458,120 1 1/4 acres and under 5 acres 27,395 19,544 58,829 70,465 176,233 5 acres and under 10 acres 12,089 13,873 30,340 25,006 81,308 10 acres and under 50 acres 16,690 18,909 33,443 28,387 97,429 50 or 100 acres 2,021 1,497 3,315 4,517 11,350 Over 100 acres 903 470 1,417 2,395 5,185 Total 168,267 63,052 162,123 436,183 829,625

It will bbe seen from this table that Belgium is pre-eminently a country of small holdings, more than half of the total number being under 50 acres in extent. Of course it is largely a country of market gardens; but as the holdings are most numerous in Brabant, East and West Flanders and Hainault, the provinces showing the largest number of milch cows, it would seem that dairying and la petite culture go together

There is a slight tendency for the holdings to decrease in number. In Germany the number of small holdings is proportionately much larger than in Great Britain. The returns collected in 1895 showed that there were 3,235,169, or 58.22% of the total number of holdings under 5 acres in area; and of these no fewer than 11% are held by servants as part of their wages. The table below compiled for the Journal at the Board of Agriculture enables us to compare the other holdings with those of Great Britain. Great Britain, it will be seen, has over 40% of large farms of between 50 and 500 acres as compared with Germany's 12.6, while the latter has 86.8 of small holdings, compared with England's 58.6.

France also has a far larger proportion of small holdings than Great Britain; its cultivated area of 85,759,000 acres being divided into 5,618,000 separate holdings, of which the size averages a little over 15 acres as against 63 in Great Britain. Of the whole number, 4,190,795 are farmed by the owners, 934,338 are in meteyage, and 1,078,184 by tenants. The leading feature is the peasant proprietary. Half of the arable, more than half of the pasture, six-sevenths of the vineyards and two-thirds of the garden lands are farmed by their owners. Comparison with Great Britain is difficult; but it would appear that, whereas only 11% of British 520,000 agricultural holdings are farmed by the owners, the proportion in France is 75%. A further point to be noted is that the average agricultural tenancy in France is just one-fourth of what it is in Great Britain, and the average owner-farmed estate only one-sixth.

Germany. Great Britain. Size of Holdings Number. Per cent. Number. Per cent. 5 to 50 acres 2,014,940 86.8 235,481 58.6 50 to 500 '' 292,982 12.6 161,438 40.1 Over 500 '' 13,809 0.6 5,219 1.3 Total 2,321,731 100 402,138 100

In France the tendency is for the very small holdings to increase in number owing to subdivision, with the consequent decrease of the size of the average holding. Between the years 1882 and 1892 there was a decrease of 138,237 in the total number of proprietors, the larger properties moving towards consolidation and those of the peasant proprietors towards subdivision.

Those interested in the formation of small holdings in Great Britain will find much to interest them in the history of Danish legislations. British policy for many generations was to preserve demesne land, and there are many devices for insuring that a spendthrift life-owner shall not be able to scatter the family inheritance; but as long ago as 1769 the Danish legislators set an exactly opposite example. They enacted that peasant land should not be incorporated or worked with estate land; it must always remain in the ownership and occupation of peasants. In this spirit all subsequent legislation was conceived, and the allotment law that came into force in October 1899 bears some resemblance to the English Small Holdings Act of 1892. It provides that labourers able to satisfy certain conditions as to character may obtain from the state a loan equal to nine-tenths of the purchase money of the land they wish to acquire. This land should be frm 5 to 7 acres in extent and of medium quality, but the limits are from 2 3/4 to 10 3/4 acres in the case of better or poorer land. The total value should not exceed 4000 kr. (L. 222). The interest payable on the loan received from the state is 3%. The load itself is repayable after the first five years by annual instalments of 4% until half is paid off; the remainder by instalments of 3 1/2%, including interest. Provision is, however, made for cases where the borrower desired to pay off the loan in larger sums. Regulations are laid down regarding the transfer of such properties and also their testamentary disposition. The Treasury was empowered to devote a sum of 2,000,000 kr.

Number and Size of Holdings in Denmark in 1901.

Groups Percentage Percentage Average size Tondeland. Acres. Number. of Number. Acreage of Area. in Acres. Under 1 Under 1.36 68,380 27.3 23,455 .3 .34 1-3 1.36-4 18,777 7.5 58,553 .7 3.12 3-27 4-36.7 93,060 37.2 1,408,549 15.8 15.14 27-108 36.7-147 60,872 24.4 4,459,077 50.1 73.25 108-216 147-294 6,502 2.6 1,272,398 14.3 195.69 Over 216 Over 294 2,392 1.0 1,674,730 18.8 700.14 Total 249,983 100.0 8,896,762 100.0 35.59

(L. 111,000) this purpose for five years; after that the land is . subject to revision.

Even before this law was passed Denmark was a country of small holdings, the peasant farms amounting to 66% of the whole, and the number is bound to increase, since the incorporation of farms is illegal, while there is no obstacle to their division. Between 1835 and 1885, the number of small holdings of less than one tondekarthorn increased from 24,800 to 92,856. What gives point to these remarks is, that Denmark seems in the way to arrest its rural exodus, and was one of the first countries to escape from the agricultural depression due to the extraordinary fall in grain prices. The distribution of land in Denmark may be gathered from a glance at the preceding table for the compilation of which we are indebted to Major Craigie.

AUTHORITIES.---Walter of Henley's Husbandry; The English Village Community, by Frederick Seebohm; Annals of Agriculture by Arthur Young; The Agricultural Labourer, by T. E. Kebbel; Report on the Employment of Messrs Tremenheere and Tufnall); A Study of Small Holdings, by W. E. Bear; The Law and the Labourer, by C. W. Stubbs; ``Agricultural Holdings in England and Abroad,'' by Major Craigie (Statistical Society's Journal, vol. i.); The Return to the Land, by Senator Jules Meline; Land Reform, by the Right Hon. Jesse Collings, M.P.; Report on the Decline in the Agricultural Population of Great Britain, issued by the Board of Agriculture and Fisheries; Report of the Departmental Committee appointed by the Board of Agriculture and Fisheries to enquire into and report upon the subject of Small Holdings in Great Britain. (P. A. G.)

ALLOTROPY (Gr. allos, other, and tropos, manner), a name applied by J. J. Berzelius to the property possessed by certain substances of existing in different modifications. Custom has to some extent restricted its use to inorganic chemistry; the corresponding property of organic compounds being generally termed isomerism (q.v..) Conspicuous examples are afforded by oxygen, carbon, boron, silicon, phosphorus, mercuric oxide and iodide.

ALLOWANCE (from ``allow,'' derived through O. Fr. alouer from the two Lat. origins adlaudare, to praise, and allocare, to assign a place; so that the English word combined the general idea of ``assigning with approval''), the action of allowing, or the thing allowed; particularly, a certain limited apportionment of money or food and diet (see DIETARY.)

In commercial usage ``allowance'' signifies the deduction made from the gross weight of goods to make up for the weight of the box or package, waste, breakages, &c. Allowance, which is customary in most industries, varies according to the trade, district or country; e.g. in the coal trade it is customary for the merchant to receive from the pit 21 cwts. of coal for every ton purchased by him, the difference of 1 cwt. being the allowance for the purpose of making good the waste caused through transhipment, screening and cartage (see TARE AND TRET.)

ALLOXAN, or MESOXALYL UREA, C4H2N2O4

/NH-CO\ CO CO \NH-CO/

an oxidation product of uric acid, being obtained from it by the action of cold nitric acid, C5H4N4O3 + H2O + O = C4H2N3O4 + CO(NH2)2. It crystallizes from water in colourless rhombic prisms, containing four molecules of water of crystallization, and possesses a very acid reaction. It serves as the starting-point for the preparation of many related substances. Zinc and hydrochloric acid in the cold convert it into alloxantin (q.v.), hydroxylamine gives nitroso-barbituric acid, C4H2N2O3: NOH, baryta water gives alloxanic acid, C4H4N2O5, hot dilute nitric acid oxidizes it to parabanic acid (q.v.), hot potassium hydroxide solution hydrolyses it to urea and mesoxalic acid (q.v.) and zinc and hot hydrochloric acid convert it into dialuric acid, C4H4N2O4. M. Nencki has shown that alloxan combines with thiourea in alcoholic solution, in the presence of sulphur dioxide to form pseudothiouric acid, C5H6N4SO3. Methyl and dimethylalloxans are also known, the former being obtained on oxidation of methyl uric acid, and the latter on oxidation of caffeine (q.v..)

ALLOXANTIN, C8H4N4O7.3H2O, a product obtained by the combination of alloxan and dialuric acid, probably possessing the constitution

NH--CO CO--NH | | | | CO C(OH)--O--CH CO | | | | NH--CO CO--NH

one of the three molecules Of water bema possibly constitutional. It forms small hard prisms which become red on exposure to air containing ammonia, owing to the formation of murexide (ammonium purpurate), C8H4(NH4)N5O6. It may also be obtained by the action of sulphuretted hydrogen on alloxan. The tetramethyl derivative, amalic acid, C8(CH3)4N4O7, has been prepared by oxidizing caffeine (q.v.) with chlorine water, and forms colourless crystals which are only slightly soluble in hot water. The formation of murexide is used as a test for the presence of uric acid, which on evaporation with dilute nitric acid gives alloxantin, and by the addition of ammonia to the residue the purple red colour of murexide becomes apparent.

ALLOYS (through the Fr. aloyer, from Lat. alligare, to combine), a term generally applied to the intimate mixtures obtained by melting together two or more metals, and allowing the mass to solidify. It may conveniently be extended to similar mixtures of sulphur and selenium or tellurium, of bismuth and sulphur, of copper and cuprous oxide, and of iron and carbon, in fact to all cases in which substances can be made to mix in varying proportions without very marked indication of chemical action. The term ``alloy'' does not necessarily imply obedience to the laws of definite and multiple proportion or even uniformity throughout the material; but some alloys are homogeneous and some are chemical compounds. In what follows we shall confine our attention principally to metallic alloys.

If we melt copper and add to it about 30% of zinc, or 20% of tin, we obtain uniform liquids which when solidified are the well-known substances brass and bell-metal. These substances are for all practical purposes new metals. The difference in the appearance of brass and copper is familiar to everyone; brass is also much harder than copper and much more suitable for being turned in a lathe. Similarly, bell-metal is harder, more sonorous and more brittle than either of its components. It is almost impossible by mechanical means to detect the separate ingredients in such an alloy; we may cut or file or polish it without discovering any lack of homogeneousness. But it is not permissible to call brass a chemical compound, for we can largely alter its percentage composition without the substance losing the properties characteristic of brass; the properties change more or less continuously, the colour, for example, becoming redder with decrease in the percentage of zinc, and a paler yellow when there is more zinc. The possibility of continuously varying the percentage composition suggests analogy between an alloy and a solution, and A. Matthiessen (Phil. Trans., 1860) applied the term ``solidified solutions'' to alloys. Regarded as descriptive of the genesis of an alloy from a uniform liquid containing two or more metals, the term is not incorrect, and it may have acted as a signpost towards profitable methods of research. But modern work has shown that, although alloys sometimes contain solid solutions, the solid alloy as a whole is often far more like a conglomerate rock than a uniform solution. In fact the uniformity of brass and bell-metal is only superficial; if we adopt the methods described in the article METALLOGRAPHY, and if, after polishing a plane face on a bit of gun-metal, we etch away the surface layer and examine the new surface with a lens or a microscope, we find a complex pattern of at least two materials. Fig. 1 (Plate) is from a photograph of a bronze containing 23.3% by weight of tin. The acid used to etch the surface has darkened the parts richest in copper, while those richest in tin remained white. The two ingredients revealed by this process are not pure copper and pure tin, but each material contains both metals. In this case the white tin-rich portions are themselves a complex that can be resolved into two substances by a higher magnification. The majority of alloys, when examined thus, prove to be complexes of two or more materials, and the patterns showing the distribution of these materials throughout the alloy are of a most varied character. It is certain that the structure existing in the alloy is closely connected with the mechanical properties, such as hardness, toughness, rigidity, and so on, that make particular alloys valuable in the arts, and many efforts have been made to trace this connexion. These efforts have, in some cases, been very successful; for example, in the case of steel, which is an alloy of iron and carbon, a microscopical examination gives valuable information concerning the suitability' of a sample of steel for special purposes.

Mixture by fusion is the general method of producing an alloy, but it is not the only method possible. It would seem, indeed, that any process by which the particles of two metals are intimately mingled and brought into close contact, so that diffusion of one metal into the other can take place, is likely to result in the formation, of an alloy. For example, if vapours of the volatile metals cadmium, zinc and magnesium are allowed to act on platinum or palladium, alloys are produced. The methods of manufacture of steel by cementation, case-hardening and the Harvey process are important operations which appear to depend on the diffusion of the carburetting material into the solid metal. When a solution of silver nitrate is poured on to metallic mercury, the mercury replaces the silver in the solution, forming nitrate of mercury, and the silver is precipitated; it does not, however, appear as pure metallic silver, but in the form of crystalline needles of an alloy of silver and mercury. F. B. Mylius and O. Fromm have shown that alloys may be precipitated from dilute solutions by zinc cadmium, tin, lead and copper. Thus a strip of zinc plunged into a solution of silver sulphate, containing not more than 0.03 gramme of silver in the litre, becomes covered with a flocculent precipitate which is a true alloy of silver and zinc, and in the same way, when copper is precipitated from its sulphate by zinc, the alloy formed is brass. They have also formed in this way certain alloys or definite composition, such as AuCd3, Cu2Cd, and. more interesting still, Cu2Sn. A very similar fact, that brass may be formed by electrodeposition from a solution containing zinc and copper, has long been known. W. V. Spring has shown that by compressing a finely divided mixture of 15 parts of bismuth, 8 parts of lead, 4 parts of tin and 3 parts of cadmium, an alloy is produced which melts at 100 deg. C., that is. much below the melting-point of any of the four metals. But these methods or forming alloys, although they suggest questions of great interest, cannot receive further discussion bore.

Our knowledge of the nature of solid alloys has been much enlarged by a careful study of the process of solidification. Let us suppose that a molten mixture of two substances A and B, which at a sufficiently high temperature form a uniform liquid, and which do not combine to form definite compounds, is slowly cooled until it becomes wholly solid. The phenomena which succeed each other are then very similar, whether A and B are two metals, such as lead and tin or silver and copper, or are a pair of fused salts, or are water and common salt. All these mixtures when solidified may fairly be termed alloys.1 If a mixture of A and B be melted and then allowed to cool, a thermometer immersed in the mixture will indicate a gradually falling temperature. But when solidification commences. the thermometer will cease to fall, it may even rise slightly, and the temperature will remain almost constant for a short time. This halt in the cooling, due to the heat evolved in the solidification of the first crystals that form in the liquid is called the freezing-point of the mixture; the freezing-point can generally be observed with considerable accuracy. In the case of a pure substance, and of a certain small class of mixtures, there is no further fall in temperature until the substance has become completely solid, but, in the case of most mixtures, after the freezing-point has been reached the temperature soon begins to fall again, and as the amount of solid increases the temperature becomes lower and lower. There may be other halts in the cooling, both before and after complete solidification, due to evolution of heat in the mixture. These halts in temperature that occur during the cooling of a mixture should be carefully noted, as they give valuable information concerning the physical and chemical changes that are taking place. If we determine the freezing-points of a number of mixtures varying in composition from pure A to pure B, we can plot the freezing-point curve. In such a curve the percentage composition can be plotted horizontally and the temperature of the freezing-point vertically, as in fig. 5. In such a diagram, a point P defines a particular mixture, both as to percentage, composition and temperature; a vertical line through P corresponds to the mixture at all possible temperatures, the point Q being its freezing-point. In the case of two substances which neither form compounds nor dissolve each other in the solid state, the complete freezing-point curve takes the form shown in fig. 5. It consists of two branches AC and BC, which meet in a lowest point C. It will be seen that as we increase the percentage of B from nothing up to that of the mixture C, the freezing-point becomes lower and lower, but that if we further increase the percentage of B in the mixture, the freezing-point rises. This agrees with the well-known fact that the presence of an impurity in a substance depresses its melting-point. The mixture C has a lower freezing or melting point than that of any other mixture; it is called the eutectic mixture. All the mixtures whose composition lies between that of A and C deposit crystals of pure A when they begin to solidify, while mixtures between C and B in composition deposit crystals of pure B. Let us consider a little more closely the solidification of the mixture represented by the vertical line PCRS. As it cools from P to Q the mixture remains wholly liquid, but when the temperature Q is reached there is a halt in the cooling, due to the formation of crystals of A. The cooling soon recommences and these crystals continue to form, but at lower and lower temperatures because the still liquid part is becoming richer in B. This process goes on until the state of the remaining liquid is represented by the point C. Now crystals of B begin to form, simultaneously with the A crystals, and the composition of the remaining liquid does not alter as the solidification progresses. Consequently the temoerature does not change and there is another well-marked halt in the cooling, and this halt lasts until the mixture has become wholly solid. The corresponding changes in the case of the mixture TUVW are easily understood --the first halt at U, due to the crystallization of pure B, will probably occur at a different temperature, but the second halt, due to the simultaneous crystallization of A and B, will always occur at the same temperature whatever the composition of the mixture. It is evident that every mixture except the eutectic mixture C will have two halts in its cooling, and that its solidification will take place in two stages. Moreover, the three solids S, D and W will differ in minute structure and therefore, probably, in mechanical properties. All mixtures whose temperature lies above the line ACB are wholly liquid, hence this line is often called the ``liquidus''; all mixtures at temperatures below that of the horizontal line through C are wholly solid, hence this line is sometimes called the ``solidus,'' but in more complex cases the solidus is often curved. At temperatures between the solidus and the liquidus a mixture is partly solid and partly liquid. This general case has been discussed at length because a careful study of it will much facilitate the comprehension or the similar but more complicated cases that occur in the examination of alloys. A great many mixtures of metals have been examined in the above-mentioned way.

Fig. 6 gives the freezing-point diagram for alloys of lead and tin. We see in it exactly the features described above. The two sloping lines cutting at the eutectic point are the freezing-point curves of alloys that, when they begin to solidify, deposit crystals of lead and tin respectively. The horizontal line through the eutectic point gives the second halt in cooling, due to the simultaneous formation of lead crystals and tin crystals. In the case of this pair of metals, or indeed of any metallic alloy, we cannot see the crystals forming, nor can we easily filter them off and examine them apart from the liquid, although this has been done in a few cases. But if we polish the solid alloys, etch them if necessary, and examine them microscopically, we shall find that alloys on the load side of the diagram consist of comparatively large crystals of lead embedded in a minute complex, which is due to the simultaneous crystallization of the two metals during the solidification at the eutectic temperature. If we examine alloys on the tin side we shall find large crystals of tin embedded in the same complex. The eutectic alloy itself, fig. 2 (Plate), shows the minute complex of the tin-lead eutectic, photographed by J. A. Ewing and W. Rosenhain, and fig. 3 (Plate), photographed by F. Osmond, shows the structure of a silver-copper alloy containing considerably more silver than the eutectic. Here, the large dark masses are the silver or silver-rich substance that crystallized above the eutectic temperature, and the more minute black and white complex represents the eutectic. It is not safe to assume that the two ingredients we see are pure silver and pure copper; on the contrary, there is reason to think that the crystals of silver contain some copper uniformly diffused through them, and vice versa. It is, however, not possible to detect the copper in the silver by means of the microscope. This uniform distribution of a solid substance throughout the mass of another, so as to form a homogeneous material, is called ``solid solution,'' and we may say that solid silver can dissolve copper. Solid solutions are probably very common in alloys, so that when an alloy of two metals shows two constituents under the microscope it is never safe to infer, without further evidence, that these are the two pure metals. Sometimes the whole alloy is a uniform solid solution. This is the case with the copper-tin alloys containing less than 9% by weight of tin; a microscopic examination reveals only one material, a copper-like substance, the tin having disappeared, being in solution in the copper.

Much information as to the nature of an alloy can be obtained by placing several small ingots of the same alloy in a furnace which is above the melting-point of the alloy, and allowing the temperature to fall slowly and uniformly. We then extract one ingot after another at successively lower temperatures and chill each ingot by dropping it into water or by some other method of very rapid cooling. The chilling stereotypes the structure existing in the ingot at the moment it was withdrawn from the furnace, and we can afterwards study this structure by means of the microscope. We thus learn that the bronzes referred to above, although chemically uniform when solid, are not so when they begin to solidify, but that the liquid deposits crystals richer in copper than itself, and therefore that the residual liquid becomes richer in tin. Consequently, as the final solid is uniform, the crystals formed at first must change in composition at a later stage. We learn also that solid solutions which exist at high temperatures often break up into two materials as they cool; for example, the bronze of fig. 1, which in that figure shows two materials so plainly, if chilled at a somewhat higher temperature but when it was already solid, is found to consist of only one material; it is then a uniform solid solution. The difference between softness and hardness in ordinary steel is due to the permanence of a solid solution of carbon in iron if the steel has been chilled or very rapidly cooled, while if the steel is slowly cooled this solid solution breaks up into a minute complex of two substances which is called pearlite. The pearlite when highly magnified somewhat resembles the lead-tin eutectic of fig. 2 (Plate). In the case of steel (see IRON AND STEEL) the solid solution is very hard, while the pearlite complex is much softer. In the case of some bronzes, for example that with about 25% of tin, the solid solution is soft, and the complex into which it breaks up by slow cooling is much harder, so that the same process of heating and chilling which hardens steel will soften this bronze.

If we melt an alloy and chill it before it has wholly solidified, we often get evidence of the crystalline character of the solid matter which first forms. Fig. 4 (Plate) is the pattern found in a bronze containing 27.7% of tin when so treated. The dark, regularly oriented crystal skeletons were already solid at the moment of chilling; they are rich in copper. The lighter part surrounding them was liquid before the chill; it is rich in tin. This alloy, if allowed to solidify completely before chilling, turns into a uniform solid solution, and at still lower temperatures the solid solution breaks up into a pearlite complex. The analogy between the breaking up of a solid solution on cooling and the formation of a eutectic is obvious. Iron and phosphorus unite to form a solid solution which breaks up on cooling into a pearlite. Other cases could be quoted, but enough has been said to show the importance of solid solutions and their influence on the mechanical properties of alloys. These uniform solid solutions must not be mistaken for chemical compounds; they can, within limits, vary in composition like an ordinary liquid solution. But the occasional or indeed frequent existence of chemical compounds in alloys has now been placed beyond doubt.

We can sometimes obtain definite compounds in a pure state by the action of appropriate solvents which dissolve the rest of the alloy and do not attack the crystals of the compound. Thus, a number of copper-tin alloys when digested with hydrochloric acid leave the same crystalline residue, which on analysis proves to be the compound Cu3Sn. The bodies SbNa3, BiNa3, SnNa4, compounds of iron and molybdenum and many other substances, have also been isolated in this way. The freezing-point curve sometimes indicates the existence of chemical compounds. The simple type of curve, such as that of lead and tin, fig. 6, consisting of two downward sloping branches meeting in the eutectic point, and that of thallium and tin, the upper curve of fig. 7, certainly give no indication of chemical combination. But the curves are not always so simple as the above. The lower curve of fig. 7 gives the freezing-point curve of mercury and thallium; here A and E are the melting-points of pure mercury and pure thallium, and the branches AB and ED do not cut each other, but cut an intermediate rounded branch BCD. There are thus two eutectic alloys B and D, and the alloys with compositions between B and D have higher melting-points. The summit C of the branch BCD occurs at a percentage exactly corresponding to the formula Hg2Tl. It is probable that all the alloys of compositions between B and D, when they begin to solidify, deposit crystals of the compound; the lower eutectic B probably corresponds to a solid complex of mercury and the compound. The point B is at -60 deg. C., the lowest temperature at which any metallic substance is known to exist in the liquid state. The higher eutectic D may correspond to a complex of solid thallium and the compound; but the possible existence of solid solutions makes further investigation necessary here. The curves of fig. 7 were determined by N. S. Kurnakow and N. A. Puschin. Sometimes a freezing-point curve contains more than one intermediate summit, so that more than one compound is indicated. For example, in the curve for gold-aluminium, ignoring minor singularities, we find two intermediate summits, one at the percentage Au2Al, and another at the percentage AuAl2. Microscopic examination fully confirms the existence of these compounds. The substance AuAl2 is the most remarkable compound of two metals that has so far been discovered; although it contains so much aluminium its melting-point is as high as that of gold. It also possesses a splendid purple colour, more remarkable than that of any other metal or alloy. Many other inter-metallic compounds have been indicated by summits in freezing-point curves. For example, the system sodium-mercury has a remarkable summit at the composition NaHg2. This compound melts at 350 deg. C., a temperature far above the melting-point of either sodium or mercury. In the system potassium-mercury, the compound KHg2 is similarly indicated. In the curve for sodium-cadmium, the compound NaCd2 is plainly shown. These three examples are taken from the work of N. S. Kurnakow. Various compounds of the alkali metals with bismuth, antimony, tin and lead have been prepared in a pure state. Such are the compounds SbNa3, BiNa3, PbNa2, SuNa4. Of these, the first three are well indicated on the freezing-point curves. The intermediate summits occurring in the freezing-point curves of alloys are usually rounded; this feature is believed to be due to the partial decomposition of the compound which takes place when it melts. The formulae of the group of substances last mentioned are in harmony with the ordinary views of chemists as to valency, but the formulae NaHg2, NaCd2, NaTl2, AuAl2 are more surprising. They indicate The great gaps in our present knowledge of the subject of valency. We must not take it for granted, when the freezing-point curve gives no indication of the compound, that the compound does not exist in the solid alloy. For example, the compound Cu3Sn is not indicated in the freezing-point curve, and indeed a liquid alloy of this percentage does not begin to solidify by the formation of crystals of Cu3Sn; the liquid solidifies completely to a uniform solid solution, and only at a lower temperature does this change into crystals of the compound, the transformation being accomoanied by a considerable evolution of heat. Until recently the vast subject of inter-metallic compounds has been an unopened book to chemists. But the subject is now being vigorously studied, and, apart from its importance as a branch of descriptive chemistry, it is throwing light, and promises to throw more, on obscure parts of chemical theory.

The graphical representation of the properties of alloys can be extended so as to record all the changes, thermal and chemical, which the alloy undergoes after, as well as before, solidification, For an example of such a diagram, see the Bakerian Lecture, 1903, Phil. Trans., A. 346. The Phase Rule of Willard Gibbs, especially as developed by Bakhuis Roozeboom, is a most useful guide in such investigations.

So far we have been considering alloys containing two metals; the phenomena they present are by no means simple. But when three or more metals are present, as is often the case in useful alloys, the phenomena are much more complicated. With three component metals the complete diagram giving the variations in any property must be in three dimensions, although by the use of contour lines the essential facts can be represented in a plane diagram. The following method, depending on the constancy of the sum of the three perpendiculars from any point on to the sides of an equilateral triangle, can be adopted:--Let ABC (fig. 8) be an equilateral triangle, the angular points corresponding to the three pure metals A, B, C. Then the composition of any alloy can be represented by a point P, so chosen that the perpendicular Pa on to the side BC gives the percentage of A in the alloy, and the perpendiculars Pb and Pc give the percentages of B and C respectively. Points on the side AB will correspond to binary alloys containing only A and B, and so on. If now we wish to represent the variations in some property, such as fusibility, we determine the freezing-points of a number of alloys distributed fairly uniformly over the area of the triangle, and, at each point corresponding to an alloy, we erect an ordinate at right angles to the plane of the paper and proportional in length to the freezing temperature of that alloy. We can then draw a continuous surface through the summits of all these ordinates, and so obtain a freezing-point surface, or liquidus; points above this surface will correspond to wholly liquid alloys. The ternary alloys containing bismuth, tin and lead have been studied in this way by F. Charpy and by E. S. Shepherd. We have here a comparatively simple case, as the metals do not form compounds. The solid alloy consists of crystals of pure tin in juxtaposition with crystals of almost pure lead and bismuth. these two metals dissolving each other in solid solution to the extent of a few per cent only. If now we cut the freezing-point surface by planes parallel to the base ABC we get curves giving us all the alloys whose freezing-point is the same; theee isothermals can be projected on to the plane of the triangle and are seen as dotted lines in fig. 9. The freezing surface, in this case, consists of three sheets each starting from an angular point of the surface, that is, from the freezing-point of a pure metal. The sheets meet in pairs along three lines which themselves meet in a point. In fig. 9, due to F. Charpy, these lines are projected on to the plane of the triangle as Ee, E'e and E''e. The area of the triangle is thus divided into three regions. The region PbEeE' contains all the alloys that commence their solidification by the crystallization of lead; similarly, the other two regions correspond to the initial crystallization of bismuth and tin respectively; these areas are the projections of the three sheets of the freezing-point surface. The points E, E', E'' are the eutectics of binary alloys. Alloys represented by points on Ee, when they begin to solidify, deposit crystals of lead and bismuth simultaneously; Ee is a eutectic line, as also are E'e and E''e. The alloy of the point e is the ternary eutectic; it deposits the three metals simultaneously during the whole period of its solidfication and solidifies at a constant temperature. As the lines of the surface which correspond to Ee, &c., slope downwards to their common intersection it follows that the alloy e has the lowest freezing-point of any mixture of the three metals; this freezing-point is 96 deg. C., and the alloy e contains about 32% of lead, 15.5% of tin and 52.5% of bismuth.

It is evident that any other property can be represented by similar diagrams. For example, we can construct the curve of conductivity of alloys of two metals or the surface of conductivity of ternary alloys, and so on for any measurable property.

The electrical conductivity of a metal is often very much decreased by alloying with it even small quantities of another metal. This is so when gold and silver are alloyed with each other, and is true in the case of alloys of copper. When a pure metal is cooled to a very low temperature its electrical conductivity is greatly increased, but this is not the case with an alloy. Lord Rayleigh has pointed out that the difference may arise from the heterogeneity of alloys. When a current is passed through a solid alloy, a series of Peltier effects, proportional to the current, are set up between the particles of the different metals, and these create an opposing electromotive force which is indistinguishable experimentally from a resistance. If the alloy were a true chemical compound the counteracting electromotive force should not occur; experiments in this direction are much needed.

Sir William Chandler Roberts-Austen has shown that in the case of molten alloys the conduction of electricity is apparently metallic, no transfer of matter attending the passage of the current. A group of bodies may, however, be yet discovered between alloys and electrolytes in which evidence may be found of some gradual change from wholly metallic to electrolytic conduction. A. P. Laurie has determined the electromotive force of a series of copper-zinc, copper-tin and gold-tin alloys, and as the result of his experiments he points to the existence of definite compounds. Explosive alloys have been formed by H. St Claire Deville and H. J. Debray in the case of rhodium, iridium and ruthenium, which evolve heat when they are dissolved in zinc. When the solution of the rhodium-zinc alloy is treated with hydrochloric acid, a residue is left which undergoes a change with explosive violence if it be heated in vacuo to 400 deg. . The alloy is then insoluble in ``aqua regia.'' The metals have therefore passed into an insoluble form by a comparatively slight elevation of temperature.

Surfusion

Metals do not appear to have been studied from the point of view of surfusion until 1880, when A. D. van Pieinsdijk showed that gold and silver would both pass below their actual freezing-points without becoming solid. Roberts-Austen pointed out that surfusion might be easily measured in metals and in alloys by the sensitive method of recording pyrometry perfected by him. He also showed that the crossing of curves of solubility, which had already been observed by H. le Chatelier and by A. C. A. Dahms in the case of salts, could be measured in the lead-tin alloys. The investigation of the mutual relations of partially miscible liquids, due to P. Alexejew, D. P. Konovalow, snd to P. E. Duclaux, was extended to alloys by Alder Wright. The addition of a third metal will sometimes render the mixture of two other metals homogeneous. C. T. Heyccck and F. H. Neville proved that when one metal is alloyed with a small quantity of some other metal, the solidification obeys the law of F. M. Raoult. Their experiments, although not conclusive, appear to indicate that the molecule of a metal when in dilute solution often consists of one atom. There are, however, numerous exceptions to this rule. In the cases of aluminium dissolved in tin and of mercury or bismuth in lead, it is at least probable that the molecules in solution are Al2, Hg2 and Bi2 respectively, while tin in lead appears to form a molecule of the type Sn4.

Industrial applications

Since 1875 increased attention has been devoted to the applications of the rarer metals. Thus nickel, which was formerly used in the manufacture of ``German silver'' as a substitute for silver, is now widely employed in naval construction and in the manufacture of steel armour-plate and projectiles. Alloyed with copper, it is used for the envelopes of bullets. A nickel steel containing 36% of nickel has the property of retaining an almost constant volume when heated or cooled through a considerable range of temperature; it is therefore useful for the construction of pendulums and for measures of length. Another steel containing 45% of nickel has, like platinum, the same coefficient of expansion as glass. It can therefore be employed, instead of that costly metal, in the construction of incandescent lamps where a wire has to be fused into the glass to establish electric connexion between the inside and the outside of the bulb. Manganese not only forms with iron several alloys of great interest, but alloyed with copper it is used for electrical purposes, as an alloy can thus be obtained with an electrical resistance that does not alter with change of temperature; this alloy, called manganin, is used in the construction of resistance-boxes. Chromium also, in comparatively small quantities, is taking its place as a constituent of steel axles and tires, and in the manufacture of tool-steel. Steels containing as much as 12% of tungsten are now used as a material for tools intended for turning and planing iron and steel. The peculiarity of these steels is that no quenching or tempering is required. They are normally hard and remain so, even at a faint red heat; much deeper cuts can therefore be taken at a high speed without blunting the tool. Vanadium, molybdenum and titanium may be expected soon to play an important part in the constitution of steel. Titanium is alloyed in small quantities with aluminium for use in naval architecture. Aluminium, when alloyed with a few per cent of magnesium, gains greatly in rigidity while remaining very light; this alloy, under the name of magnalium, is coming into use for small articles in which lightness and rigidity have to be combined. One of the most interesting amongst recent alloys is Conrad Heusler's alloy of copper, aluminium and manganese, which possesses magnetic properties far in excess of those of the constituent metals.

The importance is now widely recognized of considering the mechanical properties of alloys in connexion with the freezing-point curves to which reference has already been made. but the subject is a very complicated one, and all that need be said here, is that when considered in relation to their melting-points the pure metals are consistently weaker than alloys. The presence in an alloy of a eutectic which solidifies at a much lower temperature than the main mass, implies a great reduction in tenacity, especially if it is to be used above the ordinary temperature as in the case of pipes conveying super-heated steam. It has also been stated that alloys of metals with similar melting-points have higher tenacity when the atomic volumes of the constituent metals differ than when they are nearly the same.

RERERENCES.---Alloys have formed a subject of reoorts to several scientific societies. Sir W. C. Roberts-Austen's six Reports (1891 to 1904) to the Alloys Research Committee of the Institution of Mechanical Engineers, London, the last report being concluded by William Gowland; the Cantor Lectures on Alloys delivered at the Society of Arts and the Contribution a l'etude des alliages (1901), published by the Societe d'encouracement pour l'industrie nationale under the direction of the Commission des alliages (1896-1900), should be consulted. The theoretical aspect is discussed in Leon Guillet's Etude theorique des alliages metalliques (1904). W. T. Brannt's The Metallic Alloys (1896); Roberis-Austen's Introduction to the Study of Metallurgy (1902); and R. G. Thurston's Materials of Engineering, should be consulted for the more practical details. in The Iron and Steel Metallurgist, formerly The Metallographist (Boston, Mass.), and Metallurgie (Halle). Important memoirs by Ewing and Rosenhain, and by C. T. Hevcock and F. H. Neville in the Philosophical Transactions, by N. S. Kunrnakow in the Zeitschrift fur anorganische Chemie, and by E. S. Shepherd in the Journal of Physical Chemistry, may also be consulted. (W. C. R.-A.; F. lj. NE.)

1 The instructive case of the solidification of a solution of common salt in water is discussed in the article FUSION.

ALLPORT, SIR JAMES JOSEPH (1811-1892), English railway manager, born on the 27th of February 1811, was a son of William Allport, of Birmingham, and was associated with railways from an early period of his life. In 1843 he became general manager of the Birmingham and Derby railway, and in the following year, succeeded to the same position on the Newcastle and Darlington line. Six years later he assumed the charge of the Manchester, Sheffield and Lincolnshire (now the Great Central) railway, and finally, in 1853, was appointed to the general managership of the Midland railway--an office which he held continuously, with the exception of a few years between 1857 and 1860, when he was managing director to Palmer's Shipbuilding Company at Jarrow, until his retirement in 1880, when he became a director. During these twenty-seven years the Midland grew to be one of the most important railway systems in England, partly by the absorption of smaller lines and partly by the construction of two main extensions--on the south to London and on the north to Carlisle --whereby it obtained an independent through-route between the metropolis and the north. In the railvay world Sir James Allport was known as a keen tactician and a vigorous fighter, and he should be remembered as the pioneer of cheap and comfortable railway travelling. He was the first to appreciate the importance of the third-class passenger as a source of revenue, and accordingly, in 1872, he inaugurated the policy--subsequently adopted more or less completely by all the railways of Great Britain of carrying third-class passengers in well-fitted carriages at the uniform rate of one penny a mile on all trains. The diminution in the receipts from second-class passengers, which was one of the results, was regarded by some authorities as a sign of the unwisdom of his action, but to him it appeared a sufficient reason for the abolition of second-class carriages, which therefore disappeared from the Midland system in 1875, the first-class fares being at the same time substantially reduced.

He was also the first to introduce the Pullman car on British railways. Allport received the honour of knighthood in 1884. He died in London on the 25th of April 1892.

ALLPORT, SAMUEL (1816-1897), English petrologist, brother of the above, was born in Birmingham on the 23rd of January 1816, and educated in that city. Although occupied in business during the greater portion of his life, his leisure was given to geological studies, and when residing for a short period in Bahia, S. America, he made observations on the geology, published by the Geological Society in 1860. His chief work was in microscopic petrology, to the studyol which he was attracted by the investigations of Dr H. C. Sorby; and he became one of the pioneers of this branch of geology, preparing his own rock-sections with remarkable skill. The basalts of S. Staffordshire, the diorites of Warwickshire, the phonolite of the Wolf Rock (to which he first directed attention), the pitchstones of Arran and the altered igneous rocks near the Land's End were investigated and described by him during the years 1869--1879 in the Quarterly Journal of the Geological Society and in the Geological Magazine. In 1880 he was appointed librarian in Mason College, a post which he relinquished on account of ill-health in 1887. In that year the Lyell medal was awarded to him by the Geological Society. A few years later he retired to Cheltenham, where he died on the 7th of July 1897.

ALL-ROUND ATHLETICS. Specialization in athletic sports, although always existent, is to a great extent a modern product. In ancient times athletes were encouraged to excel in several branches of sport, often quite opposite in character. Thus the athlete held in highest honour at the Olympic Games (see GAMES, CLASSICAL) was the winner of the pentathlon, which consisted of running, jumping, throwing the javelin and the discus, and wrestling. All-round championships have existed for many years both in Scotland and Ireland, and in America there are both national and sectional championships. The American national championship was instituted in 1888, the winner being the athlete who succeeds in obtaining the highest marks in the following eleven events; 100 yards run; putting 16 lb. shot; running high jump; half-mile walk; throwing 16 lb. hammer; 120 yards hurdle race; pole vault; throwing 56 lb. weight; one mile run; running broad jump; quarter-mile run. In each event 1000 points are allowed for equalling the ``record,'' and an increasing number of points is taken off for performances below ``record,'' down to a certain ``standard,', below which the competitor scores nothing. For example, in the 100 yards run the time of 9 4/5 seconds represents 1000 points; that of 10 seconds scores 958, or 42 points less; 10 1/5 seconds scores 916, &c.; and below 14 1/5 seconds the competitor scores nothing. Should the record be broken 42 points are added for each 1/5 second. (See also ATHLETIC SPORTS.)

ALL SAINTS, FESTIVAL OF (Festum omnium sanctorum), also formerly known as ALL HALLOWS, or HALLOWMAS, a feast of the Catholic Church celebrated on the 1st of November in honour of all the saints, known or unknown. In the Roman Catholic Church it is a festival of the first rank, with a vigil and an octave. Common commemorations, by several churches, of the deaths of martyrs began to be celebrated in the 4th century. The first trace of a general celebration is in Antioch on the Sunday after Pentecost, and this custom is also referred to in the 74th homily of St Chrysostom (407). The origin of the festival of All Saints as celebrated in the West is, however, somewhat doubtful. In 609 or 610 Pope Boniface IV. consecrated the Pantheon at Rome to the Blessed Virgin and all the martyrs, and the feast of the dedicatio Sanctae Mariae ad Martyres has been celebrated at Rome ever since on the 13th of May. The idea, based on the medieval liturgiologists, that this festival was the origin of that of All Saints has now been abandoned. The latter is possibly traceable to the foundation by Gregory III. (731-741) of an oratory in St Peter's for the relics ``of the holy apostles and of all saints, martyrs and confessors, of all the just made perfect who are at rest throughout the world.'' So far as the Western Church generally is concerned, though the festival was already widely celebrated in the days of Charlemagne, it was only made of obligation throughout the Frankish empire in 835 by a decree of Louis the Pious issued ``at the instance of Pope Gregory IV. and with the assent of all the bishops,'' which fixed its celebration on the 1st of November. The festival was retained at the Reformation in the calendar of the Church of England, and also in that of many of the Lutheran churches. In the latter, in spite of attempts at revival, it has fallen into complete disuse.

ALL SOULS, DAY (Commemoratio omnium fidelimm defunctorum), the day set apart in the Roman Catholic Church for the commemoration of the faithful departed. The celebration is based on the doctrine that the souls of the faithful which at death have not been cleansed from venial sins, or have not atoned for past transgressions, cannot attain the Beatific Vision, and that they may be helped to do so by prayer and by the sacrifice of the mass. The feast falls on the 2nd of November; or on the 3rd if the 2nd is a Sunday or a festival of the first class. The practice of setting apart a special day for intercession for certain of the faithful departed is of great antiquity; but the establishment of a feast of general intercession was in the lirst instance due to Odilo, abbot of Cluny (d. 1048). The legend connected with its foundation is given by Peter Damiani in his Life of St Odilo. According to this, a pilgrim returning from the Holy Land was cast by a storm on a desolate island where dwelt a hermit. From him he learned that amid the rocks was a chasm communicating with purgatory, from which rose perpetually the groans of tortured souls, the hermit asserting that he had also heard the demons complaining of the efficacy of the prayers of the faithful, and especially of the monks of Cluny, in rescuing their victims. On returning home the pilgrim hastened to inform the abbot of Cluny, who forthwith set apart the 2nd of November as a day of intercession on the part of his community for all the souls in purgatory. The decree ordaining the celebration is printed in the Bollandist Acta Sanctorum ( Saec. VI, pt. i. p. 585). From Cluny the custom spread to the other houses of the Cluniac order, was soon adopted in several dioceses in France, and spread thence throughout the Western Church. At the Reformation the celebration of All Souls' Day was abolished in the Church of England, though it has been renewed in certain churches in connexion with the ``Catholic revival.'' Among continental Protestants its tradition lias been more tenaciously maintained. Even Luther's influence was not sufficient to abolish its celebration in Saxony during his lifetime; and, though its ecclesiastical sanction lapsed before long even in the Lutheran Church, its memory survives strongly in popular custom. Just as it is the custom of French people, of all ranks and creeds, to decorate the graves of their dead on the jour des morts, so in Germany the people stream to the grave-yards once a year with offerings of flowers.

Certain popular beliefs connected with All Souls' Day are of pagan origin and immemorial antiquity. Thus the dead are believed by the peasantry of many Catholic countries to return to their former homes on All Souls' Night and partake of the food of the living. In Tirol cakes are left for them on the table and the room kept warm for their comfort. In Brittany the people flock into the cemeteries at nightfall to kneel bare-headed at the graves of their loved ones, and to toll the hollow of the tombstone with holy water or to pour libations of milk upon it, and at bedtime the supper is left on the table for the soul's refreshment.

ALLSTON, WASHINGTON (1770-1843), American historical painter and poet, was born on the 5th of November 1779 at Waccamaw, South Carolina, where his father was a planter. He graduated at Harvard in 1800, and for a short time pursued his artistic studies at Charleston with Edward Greene Maibone (1777-1807) the miniature painter, and Charles Fraser (1782-1860). With the former, in 1801, he went to London, and entered the Royal Academy as a student of Benjamin West. with whom he formed a lifelong friendship. In 1804 he went to Paris, and, after a few months' residence there, to Rome, where he spent the greater part of the next four years. During this period he became intimate with Coleridge and Thorwaldsen. From 1809 to 1811 he resided in his native country, and from 1811 to 1817 he painted in England. After visiting Paris a second time, he returned to the United States, and practised his profession at Boston (1818--1850), and afterwards at Cambridge, Massachusetts, where he died on the 9th of July 1843. He was elected an associate of the Royal Academy in 1819. In colour and the management of light and shade Allston closely imitated the Venetian school, and he has hence been styled the ``American Titian.'' Many of his pictures have Biblical subjects, and Allston himself had a profoundly religious nature. His first considerable painting, ``The Dead Man Revived,'' executed shortly after his second visit to England, and now at the Pennsylvania Academy of Fine Arts in Philadelphia, gained a prize of 200 guineas. In England he also painted his ``St Peter Liberated by the Angel,'' ``Uriel in the Sun'' (at Stafford House), ``Jacob's Dream'' (at Petworth) and ``Elijah in the Wilderness.'' To the period of his residence in America belong ``The Prophet Jeremiah'' (at Yale), ``Saul and the Witch of Endor,'' ``Miriam,'' ``Beatrice,'' ``Rosalie,'' ``Spalatro's Vision of the Bloody Hand,'' and the vast but unfinished ``Belshazzar's Feast'' (in the Boston Athenaeum), at which he was working at the time of his death. As a writer, Allston shows great facility of expression and imaginative power. His friend Coleridge (a portrait of whom by Allston is in the National Gallery) said of him that he was surpassed by no man of his age in artistic and poetic genius. His literary works are--The Sylphs of the Seasons and other Poems (1813). where he displays true sympathy with nature and deep knowledge of the human heart; Monaldi (1841), a tragical romance, the scene of which is laid in Italy; and Lectures on Art, edited by his brother-in-law, R. H. Dana the novelist (1850).

See J. B. Flagg's Life and Letters of Washington Allston (New York, 1892).

ALLUVION (Lat. alluvio, washing against), a word taken from Roman law, in which it was one of the examples of accessio, that is, acquisition of property without any act being done by the acquirer. It signifies the gradual accretion of land or formation of an island by imperceptible degrees. If the accretion or formation be by a torrent or flood, the property in the severed portion or new island continues with the original owner until the trees, if any, swept away with it take root in the ground. Alluvion never attached at all in the case of agri limitati, that is, lands belonging to the state and leased or sold in plots. Dig. xli. 1, 7, is the main authority. English law is in general agreement (except as to agri limitati) with Roman, as appears from the judgment in Foster v. Wright, 1878, 4 C.P.D. 438. The Scottish law, as laid down by the House of Lords in Earl of Zetland v. Glover Incorporation, 1872, L.R. 2 H.L., Sc., 70, is in accordance with the English. (See WATER RIGHTS.)

ALLUVIUM, soil or land deposited by running water. All streams, from the tiniest rill to the greatest river, are continually engaged in transporting downstream solid particles of rock, the product of weathering agencies in the area which they drain. Since the capacity of a stream to carry matter in suspension is proportional to its velocity, it follows that any circumstance tending to retard the rate of flow will induce deposition. Thus a fall in the gradient at any point in the course of a stream; any snag, projection or dam, impeding the current; the reduced velocity caused by the overflowing of streams in flood and the dissipation of their energy where they enter a lake or the sea, are all contributing causes to alluviation, or the deposition of streamborne sediment. It is evident from the foregoing remarks, that while even the smallest stream may make deposits of alluvial character it is in the flood-plains and deltas of large rivers that the great alluvial deposits are to be found. The finer material constituting alluvium, often described as ``silt,'' is sand and mud. Although it may be exceedingly fine-grained, there is usually very little clay in alluvium. The larger materials include gravel of all degrees of coarseness; carbonaceous matter is often an important element. The amount of solid matter borne by large streams is enormous; many rivers derive their names from the colour thereby imparted to the water, e.g. Hwang Ho = Yellow river, Missouri = Big Muddy, the Red river, &c. It has been estimated that the Mississippi annually carries 406 1/4 million tons of sediment to the sea; the Hwang Ho 796 million tons; the Po 62 million tons. Many shallow lakes have been completely filled with alluvium and their sites are now occupied by fertile plains; this process may be seen in operation almost anywhere; a good illustration is the delta of the Rhone in Lake Geneva. Alluvial deposits may be of great size. The flood-plain of the Mississippi has an area of 50,000 sq. m.; the great delta of the Ganges and Brahmaputra has an area of about 60,000 sq. m.; that of the Hwang Ho reaches out 300 m. into the sea and has a coastal border of about 400