Logic in Compound Drugs according to Medieval Arabic Medical Books and the Cairo Genizah

抄録

This paper reveals the practice of compounding medicines from the perspective of medieval Arabic medical books and the Cairo Genizah, focusing on ophthalmology. Some researchers have argued that, due to the large number of new remedies added through experience and trade, physicians gradually became free from the classical four-quality theory. However, our study shows that a kind of logic can be discerned in compound medicines, and that this logic requires knowledge of the classical four-quality theory. The practical dimensions have been neglected because most Arabic materials do not say anything about it. Given this textual restriction, The Cairo Genizah is important for Arabic medical history, because it o ers abundant information about medical practices.

Among medical fragments of the Cairo Genizah, we focused on the speci c genre, which we would call “notebooks.” The text found in notebooks is consisting of recipes for compound medicines. Quite often, the genizah notebooks contain original recipes that are not found in the medical books. These are thought to be clearer re ections of the actual practice in medieval Cairo. We took up treatments of conjunctivitis (ramad) and eruptions of the eyelids (jarab). Firstly, we explored several medical books, and summarized the descriptions that related to the treatments of these eye diseases. Secondly, turning to the genizah notebooks, we collected recipes for the eye medicines, listed all of the ingredients, and checked their qualities. Finally, taking the characteristics of each ingredient into consideration, we examined whether or not these recipes exhibited theoretical consistency. Through a close examination of these materials, we found that the ingredients in the notebook recipes are different from those in the medical books, although their temperaments fulfill the conditions required for particular treatments. The ophthalmologists might have recognized the required effects for certain eye diseases, and then chosen substances that met those requirements.