The volume surveys the origins and development of early Greek thought, concentrating on cosmological inquiry that preceded formal logic and ethics. It opens with a discussion of primitive views and the Milesian school, then examines major pre-Socratic figures and movements—Heraclitus, Parmenides, Empedocles, Anaxagoras, the Pythagoreans, the Eleatics, Leucippus and atomism—and treats themes such as the tension between scientific explanation and traditional religion, the rise of logical methods, and problems of knowledge. Chapters combine critical commentary on fragmentary sources with comparative analysis of doctrines and an appendix summarises the ancient authorities used.