Thebit was a writer of encyclopedic range and translated from the Greek[2676] into Arabic or Syriac such authors as Apollonius, Archimedes, Aristotle, Euclid, Hippocrates, and Galen. He “was famed above all as a philosopher,”[2677] but most of his philosophical works are lost, but some geometrical treatises by him are extant, and a work on weights appears in Latin translation.[2678] A group of four astronomical treatises by him also occurs with fair frequency in medieval manuscripts.[2679] On the basis of these specimens of his astronomy Delambre was not moved to assign him any great place in the history of the science;[2680] Chwolson objects that they are too brief to do him justice,[2681] but they are probably the cream of his own contributions to the subject or the middle ages would not have translated and preserved them so sedulously.
His occult science.
Whatever Thebit’s contributions to positive knowledge may or may not have been, there is no dispute as to the fact that he was given to occult science and even superstition. His attitude towards alchemy, indeed, is doubtful, as a work of alchemy is ascribed to him in one manuscript of the fourteenth century and some notes against the art in another[2682]. But of his adhesion to astrology there is no doubt[2683], and Chwolson notes his interest in the mystic power of letters and magic combinations of them[2684]. But the one outstanding example of his occult science is his treatise on images, which seems to have been a favorite with the Latin middle ages, since it appears to have been translated into Latin twice, by Adelard of Bath[2685] and by John of Seville[2686], since the manuscripts of it are numerous,[2687] and it also was printed,[2688] and since Thebit is cited as an authority on the subject of images by such medieval writers as Roger Bacon, Albertus Magnus,[2689] the author of Picatrix,[2690] Peter of Abano,[2691] and Cecco d’Ascoli.[2692]
Astrological and magic images.
The work begins by emphasizing the need of a knowledge of astronomy in order to perform feats of magic (praestigia). The images described are astronomical or astrological and must be constructed under prescribed constellations in order to fulfill the end sought. Often, however, they are human forms rather than astronomical figures. It is not necessary to engrave them upon gems; Thebit expressly states that the material of which they are made or upon which they are engraved is unimportant, and that lead or tin or bronze or gold or silver or wax or mud or anything you please will do. The essential thing and “the perfection of mastery” is careful conformity to astrological conditions. This science of images is indeed, as Aristotle and Ptolemy have testified, the acme of astrology. Nevertheless, after the image has been properly constructed, there is usually some non-astrological ceremony to be executed in connection with it which savors of magic. Often the image is to be buried, not however in a grave as in the case of the ancient curses upon lead tablets, but in the house of someone concerned. Once two images are to be placed facing each other and wrapped in a clean cloth before burying them. Instructions are also given as to the direction in which the person burying the image should face. Also forms of words are prescribed which are to be repeated as the image is buried. Once the name of the person whom it is desired to injure is to be written with “names of hate on the back of the image.” Among the objects supposed to be achieved by such images are driving off scorpions, destroying a given region, causing misfortunes to happen to others, recovery of stolen objects, success in business or politics, protection from possible injury at the hands of the king, or the causing of an enemy’s death by bringing him into disfavor with the monarch. The treatise closes, at least in the printed text, with an admission of its essentially magic character by saying, “And this is what God the highest wished to reveal to his servants concerning magic, that His name may be honored and praised and ever exalted through the ages.” But no mention is made of demons, unless an instruction to name one image “by a famous name” alludes to some spirit.
We shall now conclude the present survey with some account of Rasis and his writings, with the exception of a number of books of experiments ascribed to him, but which it is impossible to separate from those ascribed to Galen and other authors, and of which we shall treat later under the head of such experimental literature.
Life of Rasis.
The full name of Rasis or Rhazes was Abu Bakr Muhammad ibn Zakariya ar-Razi,[2693] the last word indicating his birthplace in Persia. The date of his birth is uncertain, perhaps about 850. He died in 923 or 924.[2694] For the facts of his life we are dependent upon two Arabic writers of the thirteenth century[2695] who do little except tell one “good” story after another about him, or quote his famous sayings, most of which sound as if culled from the works of Galen. When about thirty years of age Rasis came to Bagdad and is said to have been attracted to the study of medicine by hearing how an inflamed and swollen forearm which gave great pain was marvelously cured by the application of an herb, which came to be called “the vivifier of the world.” In the early years of the tenth century Rasis served as physician in the hospital at Bagdad. According to Withington he has been called “the first and most original of the great Moslem physicians.” He also was interested in philosophy and alchemy, as his writings will show.
His 232 works.
There has come down to us a list of some 232 works ascribed to Rasis.[2696] Some of them are probably merely different wordings of the same title, others are very likely chapters repeated from his longer works, but at any rate they serve to give us some idea of his interests and the ground he covered, although of course some may be incorrectly attributed to him. Editions of the Latin translations of some of his chief medical works were printed before the end of the fifteenth century at Milan in 1481 and Bergamo in 1497.[2697] These contain the famous Liber Almansoris or Liber El-Mansuri dictus with its ten subordinate treatises: (1) introduction to medicine and discussion of human anatomy, (2) the doctrine of temperaments and humors and a discussion of the art of physiognomy,[2698] with a chapter on how to select slaves, (3) diet and drugs, (4) hygiene, (5) cosmetics, (6) rules of health and medicines for travelers, (7) surgery or “the art of binding up broken bones and concerning wounds and ulcers,” (8) poisons, (9) treatment of diseases from head to foot, (10) fevers. Following this in both editions come his works on Divisions, on diseases of the joints, on the diseases of children, and his Aphorisms or six books of medicinal secrets. Other writings by Rasis found in one or both of the printed editions are a brief treatise on Surgery, Cautery, and Leeches,[2699] the book of Synonyms, the table of antidotes, and some others which we shall have occasion to mention later. His treatise on the pestilence or on smallpox and measles was printed many times from the fifteenth to sixteenth century.