Sabour ben Sahl, whose death occurred in 869 A. D., was also connected with the hospital at Djondisabour. He was distinguished on account of his special knowledge of the properties of simple drugs and their combinations. He was also the author of the exhaustive formulary known as _Acrabadin Kebir_--probably the first one of its kind, says Le Clerc, of which history makes any mention. This formulary or dispensatory--of which a large and a small edition existed--was in general use in all the hospitals, physicians’ offices, etc., of that time. Still another most distinguished physician and author of medical treatises received his training at the Djondisabour school--viz., John, son of Serapion (or Serapion the Elder, as he is commonly called). He lived about the middle of the ninth century of the Christian era and wrote entirely in the Syrian language, but at a later date his works were all translated into Arabic. The smaller of his two most important treatises, and at the same time the one which appears to have attracted the most attention, was called the Kounnach. About the middle of the twelfth century A. D. it was translated into Latin by Gerard of Cremona, and named by him _Breviarium_; a still later translation received the name of _Practica_. The first part of this smaller treatise (the Breviarium or the Practica) is divided into six books, the titles of which are as follows:-- 1. On Nodosities, Ophiasis, and Alopecia. 2. On the Falling Out of the Eyelashes. 3. On the Mild Form of Tinea, the form which resembles Favus. 4. Scaly Affections of the Head and of Other Parts of the Skin. 5. Lice of the Head and of the Body. 6. Headache caused by Exposure to the Sun; and other forms of Cephalalgia.