Part 17

21. The next most destructive affection to which the teeth are liable, is the accumulation of _tartar_. This is an earthy substance, deposited from the saliva, and is more or less abundant in different individuals. This deposit is extremely troublesome, and generally does much injury to the mouth, even before those who suffer from it are aware of the mischief.

22. The tartar on the teeth of some individuals, is of a black or greenish color, and very hard; on those of others, brown or yellow, and not so firm. When it is first deposited, it is soft, and can be easily removed with a tooth-brush; but, if suffered to remain, it soon becomes indurated, and gradually increases in thickness about the neck of the teeth. The gums become irritated and inflamed. The sockets are next absorbed, and the teeth, being left without their natural support, either fall out, or become so loose, that they can be easily removed.

23. From this cause, old people lose their teeth, when, in many cases, they are perfectly sound; but comparatively very few are aware of the origin of this deprivation, or suppose that these valuable instruments can be retained in old age. The loss is attributed to the deleterious effects of calomel, or is imagined to be an evil inseparable from advanced age.

24. The affection of the gums, arising from causes just mentioned, is frequently called scurvy, and, like caries, produces fetor of the breath; but, when these two diseases are combined, as is frequently the case, they render it extremely offensive. Besides, the effluvia arising from these diseased parts give rise to many maladies which terminate fatally, if a remedy is not applied sufficiently early to save the patient.

25. The obvious remedy for diseases arising from tartar, is the removal of their cause. This is effected by the dentist, with small sharp cutting instruments of a suitable form. To prevent the tartar from accumulating again, and to restore the gums to a healthy state, nothing more is generally requisite than the daily use of a stiff, elastic brush, and the occasional application of some approved dentrifice or astringent wash. Sometimes it may be necessary to scarify the gums, or to apply leeches to them.

26. The operations of dentistry, mentioned in the preceding part of this article, are those which relate to the preservation of the teeth; and, if performed in a proper manner, and under favorable circumstances, they will, in most instances, prove effectual. But, as few persons resort to the dentist, until the near approach of deformity, or until they are impelled by pain to seek relief, a great proportion of dental operations consists in inserting artificial teeth, and in extracting those which are past recovery.

27. When a tooth has gone so far to decay, that it cannot be cured by _stopping_, it should not be suffered to remain in the mouth, lest it infect the rest. Front teeth, however, when the roots remain sound, and firmly based in the sockets, ought not to be extracted, as upon the latter artificial teeth can be placed with great advantage. In such cases, the removal of the crown only is necessary.

28. The instruments commonly employed in extracting teeth, are the key, or turnkey, the forceps, the hook, and the graver, or punch. These are supposed to be sufficient to perform all the operations of this kind which occur in practice; and, although many attempts have been made to invent others which might answer a better purpose, yet those we have mentioned, in their improved state, are likely to continue in general use.

29. It seems to be a common opinion, that any one can pull teeth, who has a turnkey, and sufficient physical strength to use it; accordingly, blacksmiths, barbers, and medical students, are the chief operators in this line of dental surgery. The many fatal accidents which must inevitably be the consequence, such as breaking the tooth or jaw-bone, are considered matters of course. These, however, seldom happen with skilful dentists; and it is to be regretted, that the latter are not always employed, where unskilfulness may produce such serious consequences.

30. In the cut, at the head of this article, is represented a dentist, about to extract a tooth for a lady, who may be supposed to be in a state of alarm at the sight of the instruments; but he, having thrown his right hand, which holds them, behind him, shows the other containing nothing, with the view of allaying her fears. The manner in which teeth are extracted, needs no description, since it is an every-day operation in all parts of the world.

31. One of the chief sources of income to this profession, is the insertion of artificial teeth; for, although few are willing to expend much to prevent the loss of their teeth, many will incur great expense in supplying the deficiencies, after they have occurred. So perfectly and neatly is this operation performed, by some dentists, that it is difficult to distinguish between teeth which are natural, and those which are artificial.

32. The materials for artificial teeth were formerly found chiefly in the teeth and tusks of the hippopotamus, and in the teeth of some domestic animals; but, within a few years, a mineral composition, called porcelain, has come into great repute, since it is very beautiful, and is entirely proof against the most powerful acids.

33. Surgical operations upon the teeth were performed in ancient Greece and Rome, many of which were similar to those of the present day. The extraction of teeth must have been practised at a period of antiquity to which the records of medicine do not reach. The operation is recommended by Hippocrates, who describes many of the diseases to which the teeth are liable. He also mentions the practice of fixing the teeth by means of gold wire, and gives several formulas for making dentrifices.

34. Celsus, a Roman writer on medicine, who flourished about the beginning of the Christian era, seems to have been the first author who described the method of extracting teeth, and the first who notices the removal of tartar by means of cutting instruments, as well as filling carious teeth with lead and other substances, with the view of preventing further decay. Soon after this period, false teeth, of bone and ivory, were introduced. Actius, a writer of the fourth century, is the first who mentions the operation of filing the teeth.

35. The return of barbarism to Europe, nearly extinguished the knowledge of dentistry. As a branch of surgery, however, it was revived by the Arabian writer, Albucasis, in the tenth century; but, for many hundred years after this period, it received but little attention from men of science, the operations of surgery being confined chiefly to the barbers.

36. The first modern work on the diseases of the teeth was published at Lyons, in 1581. This was followed by many other publications on the same subject, in the succeeding century. In the year 1700, it began to be required in France, that all persons who intended to practise dentistry in that country, should undergo an examination, to test their qualifications. From this period is dated the establishment of the dental art as a distinct branch of medical practice.

THE TEACHER.

1. Education, in antiquity, was entirely a matter of domestic concern. In countries where priestly or royal despotism prevailed, schools for the benefit of the sons of the great, and for the priests, were established. Moses, the Jewish lawgiver, was educated in a priestly school in Egypt, and Cyrus, at a seminary belonging to the Persian court. In Palestine, the Scriptures were taught in the schools of the prophets; and, at later periods, in the synagogues, and in the schools of the Rabbis, reading, committing to memory the sacred books, and hearing explanations of their meaning, constituted the chief exercises.

2. In the Grecian cities, boys and girls were taught reading, writing, and arithmetic in private schools; and, after having completed the primary course, those who aspired to higher degrees of knowledge, resorted to the instructions of the philosophers and sophists. This system was commenced as early as 500 years before the advent of Christ.

3. Two hundred years after this period, the Romans began to have primary schools for boys, in the cities; and, from the time of Julius Cæsar, who conferred on teachers the right of citizenship, they possessed the higher institutions of the grammarians and the rhetoricians. In the former of these, were taught the Latin and Greek languages; and in the latter, young men of talent were prepared, by exercises in declamation, for speaking in public.

4. Children, among the Greeks and Romans, were accompanied to school by slaves, who, from the performance of this duty, were called _pedagogues_; but, after slaves and freedmen had made acquirements in literature and science, they were frequently employed as tutors; hence the term, at length, came to imply a teacher of children, and it is still used in reference to this employment, although we usually connect with it the idea of pedantry.

5. Until the time of Vespasian, who commenced his reign in the year 70 of the Christian era, the schools were sustained entirely by private enterprise. That emperor instituted public professorships of grammar and rhetoric with fixed salaries, for the purpose of educating young men for the public service; and, in A.D. 150, Antoninus Pius founded imperial schools in the larger cities of the Roman empire. The most celebrated place for the cultivation of science, in the ancient world, was Athens; and, to this city, students from all parts of Europe resorted, even as late as the ninth century.

6. Christianity, by degrees, gave a new turn to education; and, in the East, it came gradually under the influence of the clergy. Schools were instituted in the cities and villages for catechumens, and, in some places, those of a higher grade, for the education of clergymen. Of the latter kind, that in Alexandria was the most flourishing, from the second to the fourth century.

7. From the fifth century, these higher institutions began to decline, and others, called cathedral or episcopal schools, seem to have taken their place. In these, besides theology, were taught _the seven liberal arts_--grammar, logic, rhetoric, arithmetic, geometry, astronomy, and music; of which the three first were called the _trivium_, and the four last the _quadrivium_. The text-book employed was the Encyclopædia of Marcianus Capella, of Africa. This compendium was published at Rome, A.D. 470; and, although a meagre production, it maintained its reputation in the schools of Europe more than 1000 years.

8. The imperial schools established by Antoninus Pius, declined, and finally became extinct, in the confusion that followed the irruption of the barbarians; but their places were supplied by the parochial and cathedral schools just mentioned. These, however, were surpassed, in the sixth century, by the _conventual_ schools, which were originally designed to prepare persons for the monastic life, but which soon began to be resorted to by laymen.

9. These schools were connected with the convents belonging to the order of St. Benedict, and served as the chief glimmering lights during the darkest period between ancient and modern civilization, in Europe. They flourished in Ireland, England, France, and Germany, from the sixth to the eleventh century. The teachers of these seminaries were called _scholastici_, and from them the scholastic philosophy derived its origin and name.

10. In the year 789, Charlemagne, king of the Franks, issued a decree for the improvement of the schools of his empire, and for increasing their number. Not only every bishop's see and every convent, but every parish, was to have its school; the two former for the education of clergymen and public officers, and the latter for the lower classes of people. This monarch instituted an academy of learned men, to whom he himself resorted for instruction, and whom he employed to educate his children, and a select number of the sons of the nobility and distinguished persons.

11. The encouragement which these schools had received from government was soon discontinued after the death of this monarch, and his school establishment declined like that of Alfred the Great, which was commenced in the ninth century, on a scale of equal liberality. The designs of the English monarch were frustrated by the invasions of the Danes.

12. In the mean time, the Jewish rabbis had schools in Syria and in Northern Africa, as well as in Europe, which contributed to the preservation of ancient learning. Arabian schools were also established, in the ninth century, by the followers of Mohammed, in their Eastern and African caliphates, and in their Moorish dominions in Spain. Through these institutions, the mathematical and medical sciences were again revived in Europe.

13. The cathedral and conventual schools continued, for a long time, the principal institutions for education in Europe; and from them proceeded many eminent men. By degrees the light of science began to shine more brightly; teachers of eminence appeared in different places, who collected around them a great number of scholars; and a new kind of schools arose, the heads of which assumed the name of _rectores_.

14. In Paris, several of these teachers gave instructions in various branches, but chiefly in rhetoric, philosophy, and theology. The schools thus collected under different masters, were, in 1206, united under one rector; and, on this account, the whole mass of teachers and scholars was denominated _universitas_. Universities, in other parts of Europe, arose in a similar manner, and some of them, about the same time. Those of Oxford and Cambridge, according to some writers, were established about the year 1200; and the two first of these institutions in Germany were founded at Prague and Vienna, the former in 1348, and the latter in 1365.

15. The division of the students into four _nations_ was an essential feature in the early universities. It arose from the circumstance that the pupils coming from different countries, spoke different languages. Those whose language was the same or similar, would naturally associate together, and attend the instructions of the same teachers. This division into nations is supposed to have grown up at Paris, previous to the formal union of the several schools under one rector.

16. The first teachers, from whose exertions the universities originated, commenced their public instructions without permission from established authority. Subsequently, the state and university were careful to prevent all persons from giving lectures, who were not well qualified for the employment. Examinations were therefore instituted to determine the capabilities of students. Those who were found competent, received a formal permission to teach, accompanied with certain symbols in the spirit of the age.

17. The first academical degree was that of _baccalaureus_, the second, _licentiatus_; and the third _magister_. The last of these entitled the student to all the privileges of his former teachers, and constituted him one of the _facultas artium--the faculty of the seven liberal arts_, since called the philosophic faculty. The other faculties were those of theology, law, and medicine. The first of these was instituted at Paris in 1259, and the two last, in 1260. The faculties elected _deans_ from among their number, who, with the _procuratores_, or heads of the four nations of students, represented the university. These representatives possessed the power of conferring degrees in the different departments of literature and science.

18. Among the public institutions of the early universities were the colleges, (_collegia_,) buildings in which students, especially those who were poor, might live together, under superintendents, without paying for their lodging. In some cases, they received their board, and frequently other allowances, gratis. These institutions were commenced at Paris; but here, as well as in other places, they did not continue the asylums of the necessitous only. In France and England, the buildings of universities are composed chiefly of these colleges, in which the students reside, and in which the business of instruction is mainly carried on.

19. The teachers in the universities were at first paid for their services by the students. At a later period, the magistrates of the town or city where the institution was located, made presents to eminent scholars, to induce them to remain. This practice finally led to the payment of regular salaries. From and after the fourteenth century, universities were not left to grow up of themselves as formerly, but were expressly established by public authorities or by the popes.

20. The inactivity and luxury of the clergy, had led to the neglect of the old seminaries of learning. The universities were therefore necessary, not only to revive the taste for science and literature, but also to form a new body of teachers. These institutions, however, at length became subject to undue clerical influence, since the monks obtained admission into them as teachers, and then labored to increase the importance of their several orders, as well as the power of the Roman pontiff.

21. The monks, also, connected, with their convents, popular schools, and undertook the education of the children in the cities. But their method of instruction was exceedingly defective, since the intelligent investigation of the subjects studied was little encouraged, and since the memory of the pupils was brought into requisition to the almost entire exclusion of the other faculties of the mind.

22. In the lower parish schools, the children were not permitted to learn to write, the monks being desirous of confining to the clergy the practice of this art, which was very lucrative before the invention of printing. The art was called _ars clericalis_; and, for a long time, the privilege of establishing writing schools for the children of citizens, was a matter of negotiation between the magistrates and the clergy.

23. But the citizens becoming, at length, more independent, the magistrates themselves began to superintend the education of youth. _Trivial_ schools were established, in which the _trivium_, and reading and writing, were taught; but for these, as well as for the cathedral and parish schools, which had been neglected for some time by the higher clergy, itinerant monks and students were employed as teachers.

24. The elder pupils of the highest class frequently wandered from one school to another, under the pretence of pursuing their studies, sometimes taking with them younger scholars, whom they compelled to beg or steal, in order to supply their wants. As late as the sixteenth century, Luther complains that these _vacantivi_ (or idlers) were the persons chiefly employed as schoolmasters in Germany.

25. A pious fraternity, called Jeronymites, consisting of clergymen and laymen, who lived together, and occupied themselves partly in mechanic arts, and partly in the instruction of youth, exerted considerable influence on education in general. They first established themselves in Italy, and afterwards in the Netherlands, on the Rhine, and in Northern Germany.

26. Much was done during the last half of the fourteenth century, and in the one hundred years that followed, to encourage the study of the ancient classics. The attention of literary men was turned to these interesting remains of antiquity by the arrival of many learned Greeks, who had fled from Turkish oppression, and who had brought with them the ancient writings.

27. These treasures of former civilization were unfolded to the modern world by the art of printing, which was invented in 1441; and the reformation, which commenced in 1517, also aided the advancement of education. The corporations of the German cities in which the reformed religion was received, founded seminaries, called _gymnasia_, and _lyceums_, with permanent professorships. A vast amount of property, belonging to the convents and the Church, was confiscated by the governments, and appropriated chiefly to the promotion of education.

28. The schools in the countries which adhered to the Roman Catholic religion, however, continued in nearly the same state, until the Jesuit schools arose, towards the end of the sixteenth century. These, on account of the ability with which they were conducted, soon gained the ascendency, and for a long time maintained their reputation; but they, at length, degenerated, and finally became extinct, on the suppression of the order of Jesuits in 1773.

29. Italy, Spain, and Portugal, have, for a long time, been inactive in relation to education, it being left entirely to the clergy, and the efforts of the people in their individual capacity. Much has been done in Austria, within fifty years, to advance this important interest. Under the late emperor, professorships were constituted, in the universities and cathedral seminaries, for the instruction of teachers; and gymnasia, common and Sunday schools, were established in almost every part of the kingdom.

30. The general organization of schools in France, in the eighteenth century, was similar to that of most other Catholic countries. The government did nothing for the education of the people at large; and the Church, which possessed a large proportion of the property of the nation, left the people in total ignorance; whence may have arisen much of the atrocity which marked the early part of the revolution.

31. During the popular reign, the education of youth was declared to be under the care of the state, and many schools, called _polytechnic_, were established. Napoleon, also, afterwards instituted several military schools, and contemplated the introduction of a system of general education. With this view, he instituted an imperial university, which was to have the supreme direction of instruction in France; but his designs were but partially carried into effect.

32. When the Bourbons were again restored to the throne of France, they, with the clergy, labored to restore the old order of things; and, to keep the common people from becoming dangerous, the Lancasterian schools, established in 1816, were abolished. Efficient measures, however, have been lately adopted by Louis Philip to establish schools of different grades throughout his kingdom.

33. In England and Ireland, although the middling and higher classes are comparatively well educated, no system of general instruction has ever been established for the benefit of the common people. Much, however, has been accomplished by charity and Sunday schools; the former of which were commenced in 1698, and the latter in 1812. Besides these, there are numerous charitable foundations on which many persons of limited means have been educated at the higher institutions.

34. In Scotland, more liberal provisions have been made for general education. The system was commenced in the reign of William and Mary, when, by an act of Parliament, every parish was required to maintain a school. The people have so far improved their privileges, that nearly all of the inhabitants of that part of Great Britain can read and write.

35. The government of Russia, during the last and present century, has directed some attention to the promotion of education. According to the decrees of the Emperor Alexander, schools of different grades were to be established throughout the empire; but these decrees have been yet only partially executed.