Full catalogue record in Fihrist: Union Catalogue of Manuscripts from the Islamicate World"al’-Farabi's importance is chiefly due to his scholarly commentaries on Aristotle. They covered the whole of the Organonthe Physicsthe De caelo&c. His intense study of the Aristotelian philosophy is indicated by the report that he lectured on the Physics 40 times and the Rhetoric 200 times. In the Islamic world he was known by the title “the second teacher”the firstby implicationbeing Aristotle. Besides the commentariesal’-Farabi also wrote monographs on logicphysicsmetaphysicsethics and politics."'Leaf.'