Professor Gutas deals here with the lives, sayings, thought, and doctrines of Greek philosophers drawn from sources preserved in medieval Arabic translations and for the most part not extant in the original. The Arabic texts, some of which are edited here for the first time, are translated throughout and richly annotated with the purpose of making the material accessible to classical scholars and historians of ancient and medieval philosophy. Also discussed are the modalities of transmission from Greek into Arabic, the diffusion of the translated material within the Arabic tradition, the nature of the Arabic sources containing the material, and methodological questions relating to Graeco-Arabic textual criticism. The philosophers treated include the Presocratics and minor schools such as Cynicism, Plato, Aristotle and the early Peripatos, and thinkers of late antiquity. A final article presents texts on the malady of love drawn from both the medical and philosophical (problemata physica) traditions.