Chapter 1

II THE ORIGIN OF THE SEXES 31

III GROWTH AND REPRODUCTION 45 I The Early Position of the Sexes. II Two Examples--The Beehive and the Spider.

IV THE EARLY RELATIONSHIP OF THE SEXES 71

V COURTSHIP, MARRIAGE, AND THE FAMILY 85 I Among the Birds and Mammals. II Further Examples of Courtship, Marriage, and the Family among Birds.