The document summarizes the historical epochs and periods of medical knowledge from primitive society to the modern age. It divides primitive history into three periods: the formation of primitive society from 2 million years ago to 40,000 years ago; the blossoming of primitive society from 40,000 years ago to the 4th millennium BC; and the decomposition of primitive society from the 4th millennium BC to the 1st millennium BC. It also discusses the evolution of human genus and society through anthropogeny and sociogeny, and the origins and early forms of medical knowledge in primitive societies.