Hunter was a strenuous partisan of replantation and transplantation of the teeth; he made various experiments on animals, and treated this important argument with particular fulness and much better than had been done up to then by others. In cases of difficult dentition he considered incision of the gums most useful and, if necessary, to be had recourse to several times. FOUCOU, the French dentist, in 1774, made known a compressor invented by him for arresting hemorrhage ensuing on the extraction of teeth. This instrument, which could be used for either jaw, exercised its pressure not only in a vertical direction, but also laterally, and did not give much inconvenience to the patient. Carabelli, who wrote seventy years later, speaks with praise of Foucou’s compressor, which he considers the best instrument of its kind. COURTOIS, in his book published in 1775,[515] says that the enamel of the teeth only reaches its perfection of development at twenty to twenty-two years of age, and begins thenceforward to wear away gradually. In speaking of the enamel, he advises avoiding the use of the file as much as possible. This author’s book is interesting for the many important clinical cases it contains. WILLICH, in 1778, related a most curious case relating to a woman, aged forty years, who had never had her menstrual function, but had, nevertheless, given birth to two children; the extraction of a tooth was followed by an alveolar hemorrhage that lasted an hour; thenceforward, this hemorrhage recurred regularly each month, for the space of eight years. BÜCKING, in 1782, published a _Complete Guide to the Extraction of the Teeth_,[516] wherein he minutely describes all the instruments, their use, the position of the operator and of the patient, indicating at the same time the instruments best adapted for the extraction of each tooth. He declares himself averse to the practice of subluxation as a means of cure for toothache, a method which, first recommended by the Arab physician Avicenna, and later, in the sixteenth century, by Peter Foreest, had fallen into oblivion for a long time, and was again brought into credit by two celebrated French dentists, Mouton and Bourdet, the latter of whom relates having had recourse to it successfully in not less than six hundred cases.