(_d_) But we need only a reminder to realize that the exogamy connected with the totem accomplishes more; that is, aims at more than the prevention of incest with the mother or the sisters. It also makes it impossible for the man to have sexual union with all the women of his own group, with a number of females, therefore, who are not consanguineously related to him, by treating all these women like blood relations. The psychological justification for this extraordinary restriction, which far exceeds anything comparable to it among civilized races, is not, at first, evident. All we seem to understand is that the rôle of the totem (the animal) as ancestor is taken very seriously. Everybody descended from the same totem is consanguineous; that is, of one family; and in this family the most distant grades of relationship are recognized as an absolute obstacle to sexual union. Thus these savages reveal to us an unusually high grade of incest dread or incest sensitiveness, combined with the peculiarity, which we do not very well understand, of substituting the totem relationship for the real blood relationship. But we must not exaggerate this contradiction too much, and let us bear in mind that the totem prohibitions include real incest as a special case. In what manner the substitution of the totem group for the actual family has come about remains a riddle, the solution of which is perhaps bound up with the explanation of the totem itself. Of course it must be remembered that with a certain freedom of sexual intercourse, extending beyond the limitations of matrimony, the blood relationship, and with it also the prevention of incest, becomes so uncertain that we cannot dispense with some other basis for the prohibition. It is therefore not superfluous to note that the customs of Australians recognize social conditions and festive occasions at which the exclusive conjugal right of a man to a woman is violated.