It was the Arabs who raised pharmacy to its proper dignity. We do not read of any noted pharmacists among them who were not physicians, but the latter were all keen students of the materia medica, and occupied themselves largely with pharmaceutical studies. But it is evident that there was a distinct profession of pharmacy. We read of Avicenna, for example, taking refuge with an apothecary at Hamdan, and there composing some of his famous works. Elsewhere a quotation from Rhazes gives some indication of the irregular practice of medicine which has prevailed in every country and among all nations; and Sprengel quotes some translated items from various Arabic authors which show that as early as the ninth century the Government sanctioned the book of pharmaceutical formulas, compiled by Sabor-Ebn-Sahel, director of the School of Dschondisabour, already mentioned. His work was frequently imitated in later times. The first London Pharmacopœia was professedly based largely on the Formulary of Mesuë. There is also evidence that both in civil life and in the army the pharmacists were closely supervised. Their medicines were inspected, and the prices at which they were sold to the public were controlled by law. The development and progress of medicine and its associated sciences among the Arabs may be very concisely sketched. The flight of Mohammed from Mecca to Medina, the Hejira as it is called, from which the Mohommedan era is dated, corresponds in our chronology with A.D. 622. The prophet died in 632. Contemporary with him lived a priest at Alexandria named Ahrun or Aaron, who compiled from Greek writers thirty books which he called the Pandects of Physic. These were translated into Syriac and Arabic about 683 by a Jew of Bassora named Maserdschawaih-Ebn-Dschaldschal. It is not in existence, and is only known by references to it made by Rhazes. The first allusion to small-pox known to history was contained in these Pandects. Serapion quotes a number of formulas which he says were invented by Ahrun. In 772 Almansor, the Caliph who founded the city of Bagdad, brought thither from Nishabur (Dschondisabour) in Persia, a famous Christian physician named George Baktischwah, who stayed for some time, and at the request of Almansor translated into Arabic certain books on Physic. He then returned to his own land, but his son was afterwards a physician in great favour with the two succeeding Caliphs, Almohdi and Haroun Al-Raschid. Freind states that when the elder Baktischwah returned to Persia Almansor presented him with 10,000 pieces of gold, and that Al-Raschid paid the younger Baktischwah an annual salary of 10,000 drachmas. The last-named ruler also brought to Bagdad the Nestorian Christian, Jahiah-Ebn-Masawaih, who, under the name of Mesuë the Elder, retained a reputation for his formulas even up to the publication of the London Pharmacopœia.