CHAPTER II
Brother and sister avoidance, a partial usage among the higher mammals—Males' attitude to females in a group dominated by a single male head—Band of exiled young males—Their relations to the sire—Examples in cattle and horses—In game-fowl—Strict localisation of animals—Exiled young males hover on the fringe of the parent group—Parricide
CHAPTER III
Effect of the absence of a special pairing season on nascent man—Consequent state of ceaseless war between sire and young males —Man already more than an ape—Results of his prolonged infancy and of maternal love—A young male permitted to live in the parent group—Conditions in which this novelty arose
CHAPTER IV
Truce between semi-human sire and son—Consequent distinction taken between female and female, as such—Consequent rise of habit of brother and sister avoidance—Result, son seeks female mate from without—Note by the editor