times calls his chief wife 'favourite,' it is merely another indication that this form of polygyny developed from monogamy, since, according to the old custom, there was but _one_ chief wife. Here, however, the chief wife is no longer necessarily the wife belonging to a man's own tribe, as was the case among the ancient Israelites; the favour of the master determines which wife shall be given the privileged place. Thus, from whatever angle we view group-marriage, its polygyny and its polyandry seem to rest on monogamy. This is true also of forms of group-marriage other than those mentioned above. Where the theft of women still continues to be a practice more serious than are the somewhat playful survivals that occur in the marriage ceremonies of cultural peoples, the one who wishes to steal a wife not infrequently secures confederates for his undertaking. Custom then commonly gives these companions a certain right to the stolen woman. This right, of course, is for the most part temporary, but it may nevertheless come to approximate the conditions of group-marriage in case the first man assists his confederates in the same way in which they have aided him. There is still another and a related motive that may lead to the same result. When a woman enters into marriage with a man of a certain tribe, she at once enters into very close relations with the tribe itself. Where tribal association has gained a preponderant importance, custom sometimes grants to all the male members of the tribe certain transient rights with respect to the woman on the occasion of her marriage. This occurs particularly when the man and woman belong to different tribes--that is, in the case of exogamy, an institution characteristic of the totemic age and to be considered later. For, the lively consciousness of kinship differences naturally tends to strengthen the right of appropriation belonging to the entire tribe. A similar thought is reflected in the mediæval _jus primæ noctis_ of certain provinces of France and Scotland, except that in place of the right of the kinship group to the possession of the individual we here find the authority of the lord over his vassals.