Ibn Rushd (1126-1198), better known as Averroes, is said to be the greatest among the Muslim commentators on Aristotle and is especially known for his influence on medieval Christendom and on medieval and Renaissance science and philosophy. This volume presents a readable translation of his middle commentaries on Aristotle's Categories and De Interpretation--the first of his middle commentaries on Aristotle's logical treatises. Originally published in 1983. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These paperback editions preserve the original texts of these important books while presenting them in durable paperback editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.