Bede wrote biblical commentaries and theological treatises. These are legendary dialogues interspersed with philosophical treatises. True mythology is distinguished from philosophical treatises and theories. The Tamil works include treatises on medicine, and commentaries on Sangam literature. He wrote many philosophical treatises such as "De omnifaria doctrina". Two encyclopedic treatises, dealing with philosophy, are often mentioned. Here, allegory is organized in the traditional arrangement of Renaissance theological treatises and confessionals. The event caused the loss of many philosophical treatises of the Hundred Schools of Thought. Instead he invested most of his time in the study of metaphysical and esoteric treatises. These are mentioned in the medieval Indian architectural treatises. Boole completed two systematic treatises on mathematical subjects during his lifetime. Some of the Persian treatises are translations from the Arabic. Ptolemy was the author of two important scientific treatises. He also wrote on squaring the circle in his mathematical treatises. The Sushruta Samhita is among the most important ancient medical treatises.