In The Riddle of the Sphinx and other publications, Róheim has elaborated the theory that man's delayed infancy, in which sexuality is less retarded than the ego in development, is responsible for culture in general; and that specific variations in the infancy situation are in the main responsible for specific variations in culture. In the present work he begins by returning to the same theme, which he illustrates by examples from several different primitive societies. He then continues with a psychological analysis of the principal professions and occupations of mankind.