It would be only natural to expect that the successors of Guy de Chauliac, and especially those who had come personally in contact with him, would take advantage of his thorough work to make still further advances in surgery. As matter of fact, decadence in surgery is noted immediately after his death. Three men taught at the University of Montpellier at the end of the fourteenth and the beginning of the fifteenth century, John de Tornamira, Valesco de Taranta, and John Faucon. They cannot be compared, Gurlt says, with Guy de Chauliac, though they were physicians of reputation in their time. Faucon made a compendium of Guy's work for students. Somehow there seemed to be the impression that surgery had now reached a point of development beyond which it could not advance. Unfortunate political conditions, wars, the withdrawal of the Popes from Avignon to Rome, and other disturbances, distracted men's minds, and surgery deteriorated to a considerable extent, until the new spirit at the time of the Renaissance came to inject fresh life into it. XII MEDIEVAL DENTISTRY--GIOVANNI OF ARCOLI If there is one phase of our present-day medicine and surgery that most of us are likely to be quite sure is of very recent development it is dentistry. Probably most people would declare at once that they had every reason to think that the science and art of dentistry, as we have it now, developed for the first time in the world's history during the last generation or two. It is extremely interesting to realize then, in the light of this almost universal persuasion, founded to a great extent on the conviction that man is in process of evolution and that as a consequence we must surely be doing things now that men never did before, to find that dentistry, both as an art and science, is old; that it has developed at a number of times in the world's history, and that as fortunately for history its work was done mainly in indestructible materials, the teeth themselves and metal prosthetic apparatus, we have actual specimens of what was accomplished at a number of periods in the olden times. Surprising as it will seem to those who hear of it for the first time, dentistry reached high perfection even in what we know as ancient history. It is rather easy to trace scientific and craftsmanlike interest in it during the medieval period and in the magnificent development of surgery that came just at the end of the Middle Ages, dentistry shared to such degree that some of the text-books of the writers on surgery of this time furnish abundant evidence of anticipations of many of the supposedly most modern developments of dentistry.