Mesuë is noted for his opposition to the violent purgative medicines which the Greek and Roman physicians had made common, and he had much to do with the popularisation, if not with the introduction of, senna, cassia, tamarinds, sebestens, myrabolans, and jujube. He modified the effects of certain remedies by judicious combinations, as, for example, by giving violet root and lemon juice with scammony. He gave pine bark and decoction of hyssop as emetics, and recommended the pancreas of the hare as a styptic in diarrhœa. A disciple of Mesuë’s, Ebn-Izak, added greatly to the medical resources of the Arabs by translations of the works of Hippocrates, Galen, Pliny, Paul of Egineta, and other Greek authors. Abu-Moussah-Dschafar-Al-Soli, commonly called Geber, the equivalent of his middle name, is supposed to have lived in the eighth century. It has already been remarked that the chemical discoveries attributed to this philosopher were probably the achievements of many workers, and were afterwards collected and passed on to posterity as his alone. From him are dated the introduction into science, to be adopted later in medicine, of corrosive sublimate, of red precipitate, of nitric and nitro-muriatic acids, and of nitrate of silver. These chemical discoveries must have been made within the hundred years from 750 to 850, because Rhazes, who wrote in the latter half of the ninth century, mentions them. Geber has been supposed to have claimed to have discovered the philosopher’s stone, and to have made the universal medicine. But it is not at all certain that he contemplated medicine at all. His language is highly figurative, and probably when he says his gold had cured six lepers he meant only that he had, or thought he had, extracted gold from six baser metals. Rhazes, whose Europeanised name is the modification of Arrasi, which was the final member of a long series of Eastern patronymics, was of Persian birth, and commenced his studies in that country with music and astronomy. When he was thirty he removed to Bagdad, and it was not until then that he took up the sciences of chemistry and medicine. Subsequently he was made director of the hospital of Bagdad, and his lectures on the medical art were attended by students from many countries. His principal work was entitled Hhawi, which has been translated Continent, apparently because it was supposed to contain all there was to know about medicine. The style of this treatise is that of notes without method, and it is certain that it could not have been written entirely by Rhazes, as authorities are named who did not live until after he had died. The theory is that Rhazes left a quantity of notes of his lectures and cases, and that some of his disciples afterwards published them with additions, but without much editing.