This is a survey of the history of Taoism from approximately the third century B.C., to the fourteenth century A.D. The main aim of this history of Taoism is to trace the major lines of its doctrinal evolution, showing the coherence of its development, the wide varieties of factors that came into play over a long period of disconnected eras, the constant absorptions of outside contributions, and the progress that integrates them. The author shows how certain recurrent themes are treated in different ways in different eras and different sects. Among these themes are the Ultimate Truth, immortality, the Sage, the genesis and the end of the world, retribution for good and evil acts, representations of heavens and hells, and the connections between life and the spirit, between life and death, between man and society, and between mystical experience and the social form of religion.