This seems the best place to call attention to some evidence for the existence of astronomical, and apparently also astrological, activity at Marseilles in the twelfth century, seemingly under the influence of the Arabic astronomy and astrology. In a manuscript at Paris which the catalogue dates of the twelfth century[255] is a treatise formerly said to have been composed at Marseilles in the year 1111 A. D. But Duhem has suggested that the XI should be XL, since the author tells of a dispute at Marseilles in 1139.[256] The text tells how to find the location of the planets for the city of Marseilles and is accompanied by astronomical tables imitating Azarchel. The same treatise appears in a manuscript at Cambridge,[257] written before the year 1175, where it is entitled “The Book of the Courses of the Seven Planets for Marseilles” and seems to be attributed to a Raymond of that city. Duhem notes that our author often cites an earlier treatise of his, _De compositione astrolabii_. The treatise opens with allusion to “many of the Indians and Chaldeans and Arabs”; the author also says, “And since we were the first of the Latins to whom this science came after the translation of the Arabs,” and avers that he employs the Christian calendar and chronology in order to avoid all appearance of heresy or infidelity. So we would seem to be justified in connecting it with the diffusion of Arabic astronomy and astrology. Our author believes that God endowed the sky with the virtue of presaging the future, cites various authorities sacred and profane in favor of astrology, and emphasizes especially the importance of astrological medicine.[258] It was also at Marseilles that William of England early in the next century in the year 1219 wrote his brief but very popular treatise, found in many manuscripts, entitled “Of Urine Unseen” (_De urina non visa_), that is, how by astrology to diagnose a case and tell the color and substance of the urine without seeing it. Of it we shall treat again later in connection with thirteenth century medicine. But we may note here that William, although of English nationality, was a citizen of Marseilles, and that the person to whom his work _Of Urine Unseen_ was addressed had formerly studied with him at Marseilles. William is also spoken of as a professor of medicine. Furthermore in at least one manuscript William of England is called a translator from the Arabic, since he is said to have translated from that tongue into Latin “The very great Secret of Catenus, king of the Persians, concerning the virtue of the eagle.”[259] We may also note that it was in reply to inquiries which he had received from Jews of Marseilles that Moses Maimonides in 1194 addressed to them his letter on astrology.[260] Interest in astronomy and astrology thus appears to have prevailed at Marseilles from the first half to the close of the twelfth century. FOOTNOTES: