The case of the power of the girl's own brother is somewhat different. Primâ facie it appears to owe its origin to the fact that it is the brothers who are mainly interested in the transaction, inasmuch as it is to them that wives come in exchange for the sisters given in marriage. Consequently we cannot, as has already been the case with the so-called levirate, assign the practice definitely either to matripotestal or patripotestal customs, for father's and mother's authority are alike overruled.

It has already been stated that we have but few data for estimating the influence of the right of betrothal on the rule of descent. Clearly the father has little to gain from the fact that his daughter follows him rather than the mother, when the inevitable effect of the marriage regulations is to make her children of the phratry and totem of her husband, and consequently to make them of a different phratry and totem from her father. Under matriliny on the other hand there is nothing to prevent the grandchildren from being of the same totem as the grandfather, and they are necessarily of the same class in a four-class tribe. If considerations with regard to the phratry and totem of the grandchildren played any part in bringing about a change in the rule of descent, this must have been based on a review of the changes that would be brought about in the position of the son's and not the daughter's offspring. But this is unlikely.

But on the other hand the father's disposal of the daughter's hand is indirectly a means of increasing his influence both with his son and in general. If the son gains his wife by an exchange of sisters, the father's authority is obviously increased. But we do not know how far this factor of the right of betrothal has operated.

Turning now to questions of inheritance, we find that properly speaking the hereditary chief is unknown in Australia. There is a tendency for the son of the tribal headman to succeed his father, but it is subject to exceptions. Moreover, it is by no means a universal rule for the tribe to have an over-headman; it may be ruled by the council of district headmen. In any case the influence of the quasi-hereditary character of the over-headmanship upon the rule of descent cannot but have been comparatively slight.

It is, on the other hand, usual for the local group and the totem kin to have headmen. In the case of the latter, age is often the qualification, as among the Dieri[27]; in such cases there is no possible effect on the rule of succession. But among some of the Victorian tribes with matrilineal descent the rule is for the son to follow the father in the headmanship[28]; and the same is the case, as we should expect, among the patrilineal eight-class tribes[29]. The most important tribe in which hereditary headmanship is combined with female descent is the Wiradjeri[30]; their neighbours, the Kamilaroi, showed marked respect to the son of a headman, if he possessed ability, though they did not, apparently, make him his father's successor[31].

On the whole, then, we cannot assign much weight to this element in the list of possible causes of the transition.

Of inheritance of chattels or land and fixtures we know little. From Spencer and Gillen we learn that among the Warramunga the mother's brother, or daughter's husband, succeeds to the boomerangs, and other moveable property[32]. Among the Kulin and the Kurnai inheritance in the male line seems to have been the rule. In the Adelaide district, as we learn from Gerstaecker[33], individual property in land was known; it descended in the male line. Among the Turribul there was individual property in bunya-bunya trees; these too devolved from father to son[34].

On the other hand on the Bloomfield property in zamia nut grounds has vested in women and descends from mother to daughter[35]; but in this remarkable variant we see, of course, not the influence of the mother's kin, but female influence or rather the right of females to the produce of their labour. In respect of other property, inheritance in North Queensland is in the male line, for it descends to blood brothers and remains in the same exogamous group from generation to generation.

This brings us to the question of the part played by the local group in causing the change from female to male descent. Under ordinary circumstances, with female descent, the local group is made up of persons of different phratries and totems; in any case, just as the phratry and totem of the members of the individual family change from generation to generation, the complexion of the local group is liable to be completely changed; though in practice the changes in one direction are no doubt counterbalanced by changes in the other, so that the net result may be nil, when the original differences were small. But we cannot suppose that the group was often evenly balanced; and a change in the rule of descent would in that case have important results for the local group and in any case for the individual family.

The importance of the difference in the constitution of the local group under descent in the male line is seen when we reflect that in the normal tribe the totem kin is practically the unit for many purposes. If, for example, an emu man has killed, let us say, an iguana man, it is the duty of the iguana men to avenge the death of their kinsman. Their vengeance need not, however, fall on the original perpetrator of the deed; according to the rules of savage justice all the emu men are equally responsible with the culprit; consequently it suffices to kill the first emu person whom they can find. Conversely, those to whom an emu man looks for defence, when he is attacked, or assistance, when he wishes to abduct a wife or anything of that sort, are his fellow emu men. It is therefore clear that the rule of male descent gives far greater security to the members of a local group; for they are surrounded by kinsmen. Under the rule of female descent, on the other hand, they probably have some kinsmen in the same group but equally a considerable number of members of other totem kins.