Synopsis This work seeks to trace the transmission of Hellenistic thought through the medium of Muslim philosophers and Jewish thinkers who lived in Muslim surroundings, to show how this thought, modified as it passed through a period of development in the Muslim community and itself modifying Islamic ideas, was brought to bear upon the culture of mediaeval Latin Christendom. The author seeks to race the history of medieval Muslim thought as to show the elements which it had in common with Christian teaching and to account for the points of divergence.