First published in 2005. The present work contains the text of the great Syriac "Book of Medicines", edited from a manuscript in my possession, in an English translation of the same, with Introduction, Index. The first section of the Book of Medicines consists of Lectures upon Human Anatomy, Pathology, and Therapeutics, to each of which is added a series of prescriptions of the most detailed character, which the author recommends to be administered in the treatment of the various diseases described in the Lecture preceding. this is here published for the first time.