[Sidenote: Incest supposed by the Dinkas to be punished with sterility.] The Dinkas of the Upper Nile believe that incest angers the ancestral spirits (_jok_), who punish the girl by making her barren. Even should she marry, she will have no children until she has confessed her sin, and atonement has been made for it. Her lover must provide a bullock for sacrifice. His father kills the animal, and the girl’s father takes some of the contents of the large intestine and smears it on his daughter’s abdomen and on that of her guilty partner. Thus the taint of sin is removed, and the woman is rendered capable of bearing children.[57.3] The Maloulekes and Hlengoues, two tribes of Southern Africa to the north of the Thonga, think that if a young man gets a girl, who is not his wife, with child, people will die in the village. Hence, when the girl’s pregnancy is discovered, the lover has to provide a girl by way of fine.[57.4] [Sidenote: Incest enjoined in certain cases as a mode of ensuring good luck.] It is very remarkable, however, that among tribes which strongly disapprove of incestuous relations in general, the act of incest is nevertheless positively enjoined in certain circumstances as a mode of ensuring good luck. Thus in the Thonga tribe of South-Eastern Africa, round about Delagoa Bay, there is a class of men who devote themselves to the business of hunting hippopotamuses on the rivers. In the pursuit of their trade they observe a number of curious superstitions which have been handed down among them for generations from father to son. For example, they inoculate themselves with a certain drug which is supposed to endow them with such a power over the hippopotamuses that when the hunter wounds one of them the animal cannot go far away and the man can track and {58} despatch it. During the day the hunter fishes in the river, keeping his eye all the time on the unwieldy monsters disporting themselves in the water or lumbering through the thickets on the banks. [Sidenote: Incest of Thonga hippopotamus hunter with his daughter.] “When he sees that the propitious season has come and when he is ready to undertake a hunting expedition of one month, he first calls his own daughter to his hut and has sexual relations with her. This incestuous act, which is strongly taboo in ordinary life, has made of him a ‘murderer’: he has killed something at home; he has acquired the courage for doing great deeds on the river. Henceforth he will have no sexual relations with his wives during the whole campaign. On the same night, immediately after the act, he starts with his sons; they close the drift where the beasts leave the river by putting a canoe across the track.” Meantime the hippopotamuses are browsing in the forest or trampling down the crops of the fields in their clumsy fashion. As they come trooping back to the river they are stopped by the canoe in the path, and while they are examining the strange obstacle, the hunters, lying in ambush,