greatest subtlety in some passage from one of{063} the ancient writers; consequently, that which was obscure or unintelligible was deemed the most sublime and philosophic. A very brief study of the _Canon_, for instance, will show this, while in graphic pictures of disease the work by no means approaches those of Aretæus or Alexander of Tralles, for Avicenna too often contented himself with mentioning merely a list of symptoms without indicating in any way their progression, characters, or duration. Undoubtedly just was the criticism of an Arabian poet: "His philosophy had no sound foundation, and his medical knowledge availed him naught for the possession of personal health and long life." Albucassis was born in Zahra, near Cordova, about the beginning of the eleventh century, and is supposed to have died A.D. 1122, at the advanced age of one hundred and one. He was author of an abridgment, or compilation, devoted to the practice of medicine, the only novelty of which is a small portion devoted to surgery, in which are described certain instruments. He says:-- "I have detailed briefly the methods of operations; I have described all necessary instruments, and I present their forms by means of drawings; in a word, I have omitted nothing of what can shed light to the profession.... But one of the principal reasons why it is so rare to meet a successful surgeon is that the apprenticeship of this branch is very long, and he who devotes himself to it must be versed in the science of anatomy, of which Galen has transmitted us the knowledge.... In fine, no one should permit himself to attempt this difficult art without having a perfept knowledge of anatomy and the action of remedies." Not a word is said about dissections, however, from which we conclude that they were not tolerated in his time. He resorted enthusiastically to the cautery, and recommended it in spontaneous luxations and the commencement of curvature of the spine. He refers particularly to instrumental{064} delivery and the extraction of the after-birth, and, when speaking of fractures and dislocations, he remarks: "This part of surgery has been abandoned to men of vulgar and uncultivated minds, for which reason it has fallen into undeserved contempt." [Illustration: 0084] Avenzoar, born in 1113, of a Spanish family which had many illustrious scions, was instructed in medicine by his father, and ultimately achieved great celebrity throughout Spain and Africa; for a time he lived at the court of the Prince of Seville, loaded with honors and presents, and finally was made Vizier. Among other works he wrote a treatise on renal diseases, in which he outlined the treatment of calculus and described an operation therefor. He died in 1161.