Part 10

The Formation of Quartz. Depth of Nevada Gold and Silver Mines. California Mining vs. Farming. New Form of Iron Manufacture. Comstock Silver Lodes.

IV.--CHEMISTRY AND PHYSICS.

Dangers from Impure Potassium Iodide. The Poplar as a Lightning Conductor. The Mariner's Compass. Crude Sulphur from Iron Pyrites. Antimony for Batteries. Delicate Test for Water. The Polarization of Electrodes. Fragarine. Balata Gum. Astronomical Notes. Giving the Positions, Rising, and Setting of the Planets for November. Professor Morton on the Electric Light. The Electrical Department in the Mechanic's Fair, Boston. The Satellites of Mars. Gold Amalgams. Another New Electric Light. Albumen of the Serum and that of Egg, and their Combinations. A Mirror Telegraph. Some Modifications of the Microphone and Telephone. Four engravings. A Chance for Electric Competition. Advantages of Experimental Study. The Black Spot of Jupiter. The Electric Light. With five engravings. Spontaneous Combustion. Recent Military Balloon Experiments. Burner for Electric Light. One engraving. Artificial Ball Lightning. One engraving. To Make Corks Air-tight and Water-tight. Electric Time Service for New York. Four engravings. The Hosmer Motor. Polarized Light. Phosphorescent Timepieces. The De Meritens Magneto-electric Machine. Two figures. Cellulose as a Material for Washers.

V.--NATURAL HISTORY, NATURE, MAN, ETC.

The Golden Cup Oak. Serpulas, or Sea Worms. One engraving. The King Tody Bird. One engraving. Life Without Air. Cadaver-poison of the Australian Natives. The Contortion of Rocks from Heat Mechanically Generated. The Stiffening of Plant Stalks. Immense Labor Performed by Bees. The Torrey Botanical Club. The Big Trees of California. Explorations in Greenland. The Umbrella Bird. One engraving. The Argan Tree. A Spruce-destroying Beetle. A Geological Discovery in Deep Water. The Mound Builder's Unit of Measure. Progress of Horticulture. Bishop Ferrette on the Cedars of Lebanon. Special Senses in Insects. Natural History Notes. New Cave Discovery in Kentucky. Longevity of the Horse. Left-handedness. Bee Culture in Egypt. The Poison Ivy and Virginia Creeper. Two engravings. The Crafty Hermit Crab. One illustration.

VI.--MEDICINE AND HYGIENE.

Nitrate of Amyl in Sea Sickness. Milk cure for Lead Colic. Milkweed Juice for Raw Surfaces. The Use of Snails in Medicine. The Art of Prolonging Life. The Deleterious Use of Alum in Bread and Baking Powders.--Alum being Substituted for Cream of Tartar. The Treatment of Hydrophobia. New Use for Warts. Removal of the Entire Scalp by Machinery. The Probable Starting Point of the Yellow Fever. Piedra. Heredity. Scientific Reliance on Soap. The Medical Ice Hat. Ventilation of Bed Rooms. The Filtration of Drinking Water. The Texas "Screw Worm."

VII.--THE PARIS EXHIBITION, SCIENTIFIC MEETINGS, ETC.

Success of American Exhibitors at Paris. The Main Building at the Exhibition. With one full page illustration. The French Industrial Exhibition of 1878. Awards and Honors at Paris. Ingram Rotary Press. One illustration. A Grand World's Fair in New York. A Mexican Exhibition. Australia to have a World's Fair. Closing of the French Exhibition. Hydraulic Motors at the Exhibition. With two engravings. The National Academy of Sciences. The Official Reports of the Paris Exhibition. American Society of Civil Engineers.

VIII.--INDUSTRY AND COMMERCE.

Should the Nation Engage in Manufactures? American Export of Agricultural Machinery. Corundum. American Made Goods Exhibited as European Manufactures. The California Tea Fields. An Odd Craft. Progress of our Foreign Trade. The Condition of Manufacturing Interests in Germany. Labor in Chicago. Apples for Europe. Adulterated Graham Flour. Addition to our List of Food Fishes. Preservation of Milk. Electrical Test for Oils. Parsnips. Russian Pottery. Two engravings. Notes from the South.--Facts about the Cotton Worm. The Mediterranean Trade. American Competition in Great Britain. Rapid Increase in French Woolen Industries. The Rockport Granite Quarries. Trade Mark Treaty with Brazil. Early Manufacture of Steel Pens. New and Stale Bread. Leather from Sheep Stomachs. New Source of Rubber. A National Law Governing Adulteration Needed. How to get Pure Teas. Skilled Labor in New York City. French Subsoil and Clearing Plow. One figure. Opening for Trade in Madagascar. Handling Grain in Buffalo. The Blue Process of Copying Tracings. We Buy of them that Advertise. Unprofitable Agents. Various Uses of Paper. Improved Grinding Mill and Crusher. Two engravings. The Cultivation of the Common Nettle. The Economic Products of Seaweed. The Japanese Wax Tree in California. Preservation of Food by Gelatin. Pearl Millet. To Turn Oak Black. Dairy and Poultry Produce in America. Australian Gum Trees. Frauds in Wine Making. Removal of Iron Coloring from Liquors. The Utilization of Iron Slag. Relative Cost of Coal Transportation by Water and by Rail. How to get Rid of Ants. The Science of Milling.

IX.--PRACTICAL RECIPES AND MISCELLANEOUS.

Progress in England and America. An Improvement on Tea Chromos. A Correction. The Stability of Modern Civilization. Future Rifle Shooting. "Bruce," the Manchester Fire Horse. The Trial of the "Pyx." Early Gold Payments. Workingmen in England and France. Washington Memorials in Northamptonshire. Three engravings. Culinary Uses of Leaves. A Remarkable Bank Robbery.--Scientific Safeguards Neglected. Cleopatra's Needle. A Steam Juryman. Roads in Baden. Indications of Progress. Practical Education in Russia. Table Forks. The Cost of Insecurity. Improved Copying Pencils.

Answers to Correspondents, embodying a large quantity of valuable information, practical recipes, and instructions in various arts.

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STRONG AND CHEAP SPAR BRIDGES.

General description, dimensions, and particulars, with 2 pages of drawings, covering illustrations of all the details, for a bridge of 100 feet span or less; specially useful for crossing of creeks, small rivers, gullies, or wherever a costly structure is not desirable. The drawings are from the Spar Bridge exhibited at the Centennial, in the U. S. Department of Military Engineering. These bridges are wholly composed of undressed stuff. SUPPLEMENT 71. Price 10 cents.

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FIREPROOF DWELLINGS OF CHEAP CONSTRUCTION. A valuable and important paper, containing Plans and Descriptions of Model Fireproof Dwellings of cheap construction lately erected in Chicago. By A. J. Smith, Architect. With 9 illustrations. Plan No. 1 exhibits the construction of comfortable one-story, 16 ft. front dwellings, of brick and concrete, finished complete at a cost of $1,200. Plan No. 2 exhibits the construction of a comfortable 23 ft. front, two-story dwelling, of brick and concrete, finished complete, with cellar, for $1,700. Several of these dwellings, on both plans, have been built at the prices stated. This valuable paper also contains the Report of the City Authorities of Chicago, certifying to the fireproof nature of these buildings, with other useful particulars. Contained in SCIENTIFIC AMERICAN SUPPLEMENT No. 91. Price 10 cts. To be had at this office and of all newsdealers.

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OUTWARD MARKS OF A GOOD COW.

By Capt. JOHN C. MORRIS, Pa. Carelessness in Breeding. How to Select for Breeding. Marks of the Handsome Cow. Care and Training of the Heifer. Infallible Marks of Good Milkers. Distinguishing Marks and Characteristics of the "Bastard" and the "Bogus" Cow, etc. Contained, with useful Remarks on Bee Culture, in SCIENTIFIC AMERICAN SUPPLEMENT No. 135. Price 10 cents. To be had at this office and of all newsdealers.

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ON CHRONIC MALARIAL POISONING.

By ALFRED L. LOOMIS, M.D. A Highly Instructive Clinical Lecture, delivered at the University Medical College, N. Y Contained in SCIENTIFIC AMERICAN SUPPLEMENT No. 102. Price 10 cents. To be had at this office and of all newsdealers.

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ICE-HOUSE AND COLD ROOM.--BY R. G. Hatfleld. With directions for construction. Four engravings. SUPPLEMENT No. 59. Price, 10 cents.

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THE

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NEW PATENT LAW

FOR

SPAIN, CUBA, PORTO RICO, ETC.

By the terms of the New Patent Law of _Spain_, which has lately gone into operation, the citizens of the United States may obtain Spanish Patents on very favorable conditions.

The Spanish Patent covers SPAIN, and all the Spanish Colonies, including CUBA, Porto Rico, the Philippine Islands, etc. Total cost of obtaining the Patent, $100. Duration of the Patent, 20 years, 10 years, and 5 years, as follows:

The Spanish Patent, if applied for by the original inventor before his American patent is actually issued, will run for 20 years. Total cost of the patent, $100. It covers Spain, Cuba, etc. The Spanish Patent, if applied for by the original inventor not more than two years after the American patent has been issued, will run for 10 years. Total cost of patent, $100. Covers Spain, Cuba, etc.

_A Spanish Patent of Introduction_, good for 5 years, can be taken by any person, whether inventor or merely introducer. Cost of such patent, $100. Covers Spain, Cuba, and all the Spanish dominions.

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Further particulars, with Synopsis of Foreign Patents, Costs, etc., furnished gratis.

MUNN & CO., Solicitors of American and Foreign Patents, Proprietors of the SCIENTIFIC AMERICAN, 37 PARK ROW, NEW YORK.

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WATER SUPPLY FOR TOWNS AND Villages.--By Clarence Delafield, C.E. A concise and valuable report, showing the costs and merits of the various systems--Discussion of the Holly system, its merits and defects--The reservoir system, with pumps, cost, and advantages--Results obtained and economy of use of various systems in different towns, with names and duty realized--Facts and figures to enable town committees to judge for themselves as to the system best suited for their wants--The best sources of water supply-- Water-bearing rocks--Artesian wells, their feasibility, excellence, and cost of boring--Importance of pure water--How surface water is rendered impure--Cost of water pipes, from 2 to 12 inches diameter, for towns, including laying, all labor, materials, gates, joints, etc. Estimates of income, water-rates for supply of 1,000 buildings. Contained in SUPPLEMENT 27. Price 10 cents.

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ICE BOATS--THEIR CONSTRUCTION and management. With working drawings, details, and directions in full. Four engravings, showing mode of construction. Views of the two fastest ice-sailing boats used on the Hudson river in winter. By H. A. Horsfall, M.E. SUPPLEMENT 1. The same number also contains the rules and regulations for the formation of ice-boat clubs, the sailing and management of ice-boats, etc. Price 10 cents.

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ICE AND ICE-HOUSES--HOW TO MAKE ice ponds; amount of ice required, etc., and full directions for building ice-house, with illustrated plan. SUPPLEMENT 55. Price 10 cents.

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CAVEATS, COPYRIGHTS, TRADE MARKS, ETC.

Messrs. Munn & Co., in connection with the publication of the SCIENTIFIC AMERICAN, continue to examine Improvements, and to act as Solicitors of Patents for Inventors.

In this line of business they have had OVER THIRTY YEARS' EXPERIENCE, and now have _unequaled facilities_ for the preparation of Patent Drawings, Specifications, and the Prosecution of Applications for Patents in the United States. Canada, and Foreign Countries. Messrs. Munn & Co. also attend to the preparation of Caveats, Trade Mark Regulations, Copyrights for Books, Labels, Reissues, Assignments, and Reports on Infringements of Patents. All business intrusted to them is done with special care and promptness, on very moderate terms.

We send free of charge, on application, a pamphlet containing further information about Patents and how to procure them; directions concerning Trade Marks, Copyrights, Designs, Patents, Appeals, Reissues, Infringements, Assignments, Rejected Cases, Hints on the Sale of Patents, etc.

_FOREIGN PATENTS._--We also send, _free of charge_, a Synopsis of Foreign Patent Laws, showing the cost and method of securing patents in all the principal countries of the world. American inventors should bear in mind that, as a general rule, any invention that is valuable to the patentee in this country is worth equally as much in England and some other foreign countries. Five patents--embracing Canadian, English, German, French, and Belgian--will secure to an inventor the exclusive monopoly to his discovery among about ONE HUNDRED AND FIFTY MILLIONS of the most intelligent people in the world. The facilities of business and steam communication are such that patents can be obtained abroad by our citizens almost as easily as at home. The expense to apply for an English patent is $75; German, $100; French, $100; Belgian, $100; Canadian, $50. _COPIES OF PATENTS._--Persons desiring any patent issued from 1836 to November 26, 1867, can be supplied with official copies at reasonable cost, the price depending upon the extent of drawings and length of specifications.

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When ordering copies, please to remit for the same as above, and state name of patentee, title of invention, and date of patent.

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BAIRD'S

CATALOGUES OF BOOKS

Our new and enlarged CATALOGUE OF PRACTICAL AND SCIENTIFIC BOOKS, 96 pages, 8vo; a Catalogue of Books on DYEING, CALICO PRINTING, WEAVING, COTTON and WOOLEN MANUFACTURE, 4to; Catalogue of a choice collection of PRACTICAL, SCIENTIFIC, and ECONOMIC BOOKS, 4to; List of Books on STEAM AND THE STEAM ENGINE, MECHANICS, MACHINERY, and ENGINEERING, 4to; List of Important Books on METALLURGY, METALS, STRENGTH OF MATERIALS, CHEMICAL ANALYSIS, ASSAYING, etc., 4to; two Catalogues of Books and Pamphlets on SOCIAL SCIENCE, POLITICAL ECONOMY, BANKS, POPULATION, PAUPERISM, and kindred subjects sent free to any one who will forward his address.

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An engine that works without Boiler. Always ready to be started and to give at once full power.

SAFETY, ECONOMY, CONVENIENCE.

Burns common Gas and Air. No steam, no coal, no ashes, no fires, no danger, no extra insurance. Almost no attendance.

THE NEW OTTO SILENT GAS ENGINE.

Useful for all work of small stationary steam engine. Offered in sizes of 2, 4, and 7 H.P. Send for illustrated circular. SCHLEICHER, SCHUMM & CO., Phila., Pa.

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A GOOD PLAN

_The most profitable plan_ for operating in stocks is by uniting capital of various sums in combining or pooling orders of thousands of customers and using them as _one mighty whole_, which is done so successfully by Messrs. Lawrence & Co., Bankers, 57 Exchange Place, N. Y. City. By this cooperative system each investor is placed on an equal footing with the largest operator and profits divided _pro rata_ among shareholders every 30 days. $10 invested makes $50 or 5 per cent. on the stock during the month--$50 returns $350 or 7 per cent., $100 pays $1,000, or 10 per cent., and so on according to the market. The firm's new circular (copyrighted and free) contains "Two unerring rules for success in stock operations," and explains everything. All kinds of Stocks and Bonds wanted. New Government Loan supplied. LAWRENCE & CO., _Bankers and Brokers_, 57 Exchange Place, N. Y. City.

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PORTABLE GRAIN MILLS.

For Mill and Farm. Built on the durable and scientific principles. Warranted fully equal to any in the market. Mills for grinding all substances. We have made mill building a specialty for 13 years.

WALKER BROS. & CO.,

Engineers, Founders & Machinists,

23d and Wood St., Phila., Pa.

ON THE CARE OF HORSES. BY PROF. PRITCHARD, R.V.S. Showing the Proper Construction of Stables. Best Floor. Lighting and Ventilation. Hay-racks. Watering and Feeding. Grooming and Exercise. Cracked Heels; Lice; Colic; Mud Fever; Wind Galls. Also, in same number, facts about improved Cow Stables. How to keep Cows clean and maintain Pure Air in Stables. Increased Cleanliness and Convenience with Less Labor. Contained in SCIENTIFIC AMERICAN SUPPLEMENT. No. 123. Price 10 cents. To be had at this office and of all newsdealers.

MINING MACHINERY. ENGINES, BOILERS, PUMPS, Coal and Ore Jigs, Dust Burning Appliances. Drawings and advice free to customers. Jeanesville Iron Works (J. C. Haydon & Co.). Address HOWELL GREEN, Supt., Jeanesville, Luzerne Co., Pa.

Straub's Scientific GRAIN MILL, 12, 20, and 30 inch

MILL STONES,

For Farm and Merchant work. Warranted the full equal of any mill built in America. Before purchasing elsewhere send for our circular and price list.

A. W. STRAUB & CO.,

Philadelphia, Pa.

USE WILHIDE'S NOISELESS, SELF-Setting Rat and Mouse Traps. Caught 19 rats one hour; 46 one night. Ask your storekeeper for them. State right for sale. Circulars, etc., free. J. T. WILHIDE & BRO., York Road, Carroll Co., Md.

AGENTS and SALESMEN wanted in every city and town to introduce a new Work, the

"COMPLETE BUSINESS REGISTER" to dealers. Great inducements. Don't fail to write for particulars. W. H. Pamphilon, Pub., 30 Bond St., N. Y.

LADIES CAN MAKE $5 A DAY IN THEIR OWN CITY OR TOWN. ADDRESS ELLIS M'F'G CO., WALTHAM, MASS.

THE "BIJOU" MICROSCOPE,

WITH MOUNTED OBJECTS, 50C. A COMPLETE LITTLE INSTRUMENT FOR EXAMINING MINUTE OBJECTS. HAS ADJUSTABLE LENS-CAP, OBJECT SLIDES AND DIAPHRAGM, AND MAGNIFIES 10,000 TIMES. A MARVEL OF PERFECTION, CHEAPNESS, SIMPLICITY AND COMPACTNESS. OF PRETTY DESIGN AND NICELY FINISHED IN BRASS. PRICE, WITH AN ASSORTMENT OF INTERESTING MOUNTED MICROSCOPIC OBJECTS, 50C. SENT POST PAID ON RECEIPT OF PRICE TO GEM MICROSCOPE CO., 156 FULTON ST., N. Y.

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CONTAINS 12 SHEETS PAPER, 12 ENVELOPES, 3 SHEETS COLORED PAPER, 1 LEAD PENCIL, 3 PENS, 1 TEXT, 12 COMIC CARDS, 40 SILHOUETTES, 36 MOTTOES, 85 PATTERNS FOR FANCY WORK, 112 DECALCOMANIE, 131 EMBOSSED PICTURES, 50 FANCY ORNAMENTS, 1 PENHOLDER, 2 BOOK MARKS, 5 BLACK TABLETS, 5 PICTURE CARDS, 30 SCRAP-BOOK PICTURES, 1 XMAS BANNER, 1 GAME AGE CARDS, 2 XMAS CARDS, 1 TOY PARASOL. PRICE, 42 CTS.; BY MAIL. 53 CTS. RETAIL VALUE, $1.45. _POSTAGE STAMPS TAKEN_. J. JAY GOULD, 10 BROOMFIELD ST., BOSTON, MASS.

GOLD, SILVER, AND NICKEL PLATING.

A TRADE EASILY LEARNED. COSTS LITTLE TO START. THE ELECTRO PLATER'S GUIDE, A 72 PAGE BOOK, SENT FOR 3 STAMPS. SCIENTIFIC INSTRUMENTS AND BOOKS LOANED TO ANY ONE. PRICE LIST FREE. F. LOWEY, 90 11TH ST., BROOKLYN, N. Y.

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