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This volume presents three of the Epistles of the Brethren of Purity, a monumental work of medieval Islamic learning. These epistles explore applications of mathematics in music, medicine, and alchemy; scientific knowledge and the classification of sciences; and the place of the arts, industries, and trades in the Islamic cosmos.

This volume presents Epistles 39-41 of the Epistles of the Brethren of Purity, which deal with the types of movement; causes and effects; and definitions and descriptions of things. the Ikhwan considers both the philosophical and spiritual value of these topics