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HERBERT FRANKE
their functions in the Yuan-shih. On the Chinese side, the leading astronomer was Kuo Shou-ching (1231-1316). To him fell the difficult task of reconciling the Arab astronomical system with traditional Chinese astronomy which had entirely different mathematical and geometrical foundations. As I am not a specialist in the history of science, I have to refer to Needham's detailed study of this problem.7
Another field where Western Asians reached some prominence in China was medicine. It seems as if the skill of Westerners in surgery greatly impressed the Chinese, because physicians from the Near East who performed all sorts of difficult operations are frequently mentioned. Some of them were not Muslim but Nestorian Christians, like Ai-hsieh (1227-1308) whose Chinese name is a rendering of Syriac Isa, Yehoshua, or Jesus. He was not only a famous physician but also for some time served as a Court Astronomer under Kublai Khan prior to the arrival of Jamal ad-Din. Ai-hsieh reached high offices at Kublai's court and was even honored posthumously by having his biography included in the Yüan dynastic history. His activities in China, however, and the presence of many other doctors from the Western Regions, failed to leave a permanent impact on Chinese medicine. The theoretical framework of traditional Chinese medicine continued to be the basis for medical literature and there is not much trace of Western contacts to be noticed in such medical and pharmacological Chinese works as the Pen-ts'ao kang-mu by Li Shih-chen (sixteenth century). On the other hand Chinese medicine was made known rather widely in Islamic countries, as we shall see later. It seems, in any case, that individual skills and techniques were appreciated in Yüan China rather than new theoretical issues and ideas that were entirely foreign to the Chinese. This is certainly the case in both astronomy and medicine; both remained faithful to the inherited theories in spite of occasional borrowings from the West.
Technology was another field where Westerners were active in China. We have mentioned artillery already. The catapults used by the Mongol and Northern Chinese armies against the fortified town of Hsiang-yang on the Han River were built by Mohammedan engineers. Hsiang-yang has, during a long period in Chinese history, been a town of great strategic importance. Whoever commanded Hsiang-yang could block the access to the fertile Middle