There are special chapters devoted to eye and ear diseases, and to various affections of the face. Under this the question of tattooing and its removal comes in. It is surprising how much Aetius has with regard to such nasal affections as polyps and ulcers and bleedings from the nose. In this book, however, he treats only of their medicinal treatment. What he has to say about affections of the teeth is so interesting that it deserves a paragraph or two by itself. He had much to say with regard to the nervous supply of the mucous membranes of the gums, tongue, and mouth, and taught that the teeth received nerves through the small hole existing at the end of every root. For children cutting teeth he advised the chewing of hard objects, and thought that the chewing of rather hard materials was good also for the teeth of adults. For fistulas leading to the roots of teeth he suggests various irritant treatments, and, if they do not succeed, recommends the removal of the teeth. He seems to have known much about affections of the gums and recognizes a benignant and malignant epulis. He thought that one form of epulis was due to inflammation of a chronic character, and suggests that if remedies do not succeed it should be removed. His work is of interest mainly as showing that even at this time, when the desire for information of this kind is usually supposed to have been in abeyance, physicians were gathering information about all sorts even of the minor ailments of mankind, gathering what had been written about them, commenting on it, adding their own observations, and in general trying to solve the problems as well as they could. Aetius seems to have had a pretty good idea of diphtheria. He speaks of it in connection with other throat manifestations under the heading of "crusty and pestilent ulcers of the tonsils." He divides the anginas generally into four kinds. The first consists of inflammation of the fauces with the classic symptoms, the second presents no inflammation of the mouth nor of the fauces, but is complicated by a sense of suffocation--apparently our croup. The third consists of external and internal inflammation of the mouth and throat, extending towards the chin. The fourth is an affection rather of the neck, due to an inflammation of the vertebrae--retropharyngeal abscess--that may be followed by luxation and is complicated by great difficulty of respiration. All of these have as a common symptom difficulty of swallowing. This is greater in one variety than in another at different times. In certain affections even "drinks when taken are returned through the nose."