Part one: the mountain-dwelling Arapesh -- Mountain life -- A co-operative society -- The birth of an Arapesh child -- Early influences that mould the Arapesh personality -- The growth and initation of an Arapesh boy -- The growth and betrothal of an Arapesh girl -- Arapesh marriage -- The Arapesh ideal and those who deviate from it -- Part two: The river-dwelling Mundugumor -- The pace of life in a cannibal tribe -- The structure of Mundugumor society -- The development of the individual Mundugumor -- Youth and marriage among the Mundugumor -- Deviants from the Mundugumor ideal -- Part three: The lake-dwelling Tchambuli -- The pattern of Tchambuli social life -- The contrasting rôles of Tchambuli men and women -- The unplaced Tchambuli man and woman -- Part four: The implication of these results -- The standardization of sex-temperament -- The deviant -- Conclusion.