. "According to A. C. Brehm, 2 the nature of the troop or horde among monkeys makes constant matings between the head of the horde and his daughters, sisters and other close relatives, wholly inevitable; in fact, among all polygamous animals, whether gorilla, wild boar, or elephant, the leading male must enjoy the favours of his daughters, granddaughters and great-granddaughters, as long as he is abl" . . .