For serious students of history of culture, for scientists --for anthropologists and enthonolgists -- this is a controversial study of civilization as the unfinished product of evolutionary forces, awayed by biological inheritance, physical environment, cultural endowment. Dr. Huntington traces the continuity of this evolutionary process, he supports his basic theory of ""kiths as opposed to ""races"", groups of people whose characteristics depend on heredity and culture; and he analyzes physical environment and psychological reactions -- the ""cycle"" theory, with its close association with atmospheric difference.