This study traces Greek science through the work of the Pythagoreans, the Presocratic natural philosophers, the Hippocratic writers, Plato, the fourth-century B.C. astronomers, and Aristotle. G. E. R. Lloyd also investigates the relationships between science and philosophy and science and medicine, he discusses the social and economic setting of early Greek science, and he analyzes the motives and incentives of the different groups of writers.