_Persia._--Rhazes, whose full name is Abou Beer Mohammed ben Zakarya, is generally admitted to have been the most illustrious of Persia’s physicians, and probably the most distinguished representative of Arab medical learning. He was born at Raj, in the Province of Khorassan, about 850 A. D. After he had received his professional training at Bagdad, he settled at Raj and was soon afterward appointed director of the local hospital. At a later date he was placed in charge of the hospital at Bagdad, but before many months had elapsed he returned to Raj, his native town, and here he spent most of the remaining years of his long life. The date of his death is stated by Haeser as either 923 or 932 A. D., but Le Clerc mentions only the latter date. Rhazes was a very hard worker and was highly esteemed by his fellow countrymen, who called him the Arabian Galen. The total number of writings which he left behind him at the time of his death was 237, most of them dealing with medical subjects. A few of them, however, were devoted to the discussion of chemical, anatomical and philosophical questions. To-day we possess only 36 of the treatises written by Rhazes, and of this number only six have been printed in Latin. His greatest work, as all critics admit, is that which is commonly known as the “Continens” (or “El Haouy”). In this work, which is divided into twenty-two books, Rhazes gives in a condensed form the views entertained by all his predecessors regarding the more important questions in medical science, and then adds thereto the conclusions which his own experience has led him to form. He also wrote a second treatise (in ten books) which was esteemed by the physicians of that and later periods almost as highly as the Continens. It was called the “Mansoury,” and its contents are distributed as follows: I., Anatomy; II., the Different Temperaments; III., Alimentary Substances and Drugs; IV., Hygiene; V., Cosmetics; VI., the Regimen to be adopted in Traveling; VII., Surgery; VIII., Poisons; IX., Maladies in General; X., Fevers.