The most important of these was Avicenna, born toward the end of the tenth century in the Persian province of Chorasan, at the height of Arabian influence. He is sometimes spoken of as the Arabian Galen. His famous book, "The Canon," was the most consulted medical book throughout Europe for centuries. There are very few subjects in medicine that did not receive suggestive treatment at his hands. He has definite information with regard to Bubonic plague and the _filaria medinensis_. He has special chapters with regard to obesity, emaciation, and general constitutional conditions. He has chapters on cosmetics and on affections of the hair and nails that are interesting reading. The Renaissance scholars wrote many commentaries on his work, and for long after the introduction of printing his influence was felt widely. His Arabic colleague in the West was Avenzoar, to call him by the transformation of his Arabic family name, Ibn-Zohr. He was born near Seville, and probably died there, in 1162, well past ninety years of age. He was the teacher of Averröes, who always speaks of him with great respect. He is interesting as probably the first to suggest nutrition per rectum. His apparatus for the purpose consisted of the bladder of a goat with a silver cannula fastened into its neck. Having first carefully washed out the rectum with cleansing and purifying clysters, he injected the nutriment--eggs, milk, and gruel--into the gut. His idea was that the intestine would take this and, as he said, suck it up, carrying it back to the stomach, where it would be digested. The bladders of animals were very commonly used by these Moorish physicians and by their disciples, and the profession generally, for generations, for a great many purposes for which we now use rubber bags. Abulcasis, for instance, used a sheep's bladder introduced into the vagina and filled with air as a colpeurynter for supporting the organs in the neighbourhood, and also in fractures of the pubic arch.