the marriage customs of the blacks result in very ill-assorted unions as regards age; for it is usual to see old men with mere girls as wives, and men in the prime of life married to old widows. As a rule wives are not obtained by the men until they are at least thirty years of age. Women have very frequently two husbands during their lifetime, the first older and the second younger than themselves. Of course, as polygamy is the rule and the men of the tribe exceed the females in number besides, there are always many bachelors in every tribe; but I never heard of a female over sixteen years of age who, prior to the breakdown of aboriginal customs after the coming of the whites, had not a husband.[218] And Bonwick says: The old men, who get the best food and hold the franchise of the tribe in their hands, manage to secure an extra supply of the prettiest girls.[219] A further evidence of the keen sexual interest of the male is furnished by the fact that even when the difficulties in the way of getting a wife are regularly overcome by the youth, the other men of the group, especially the older ones, reserve a temporary but prior claim on her.[220] In addition to a lively sexual interest in the women of their own group, we find that even the lowest races have a well-developed appreciation of the property value of women. In the earliest times women were the sole creators of certain economic values, and since the women contributed as much or more to the support of the men as the men contributed to the support of the women, the men naturally got and kept as many women as possible.[221] The condition prevailing in this regard in central Australia is stated by Howitt: It is an advantage to a man to have as many _Piraurus_ as possible. He has then less work to do in hunting as his _Piraurus_ when present supply him with a share of the food which they procure, their own _Noas_ being absent. He also obtains great influence in the tribe by lending his _Piraurus_ occasionally and receiving presents from young men to whom _Piraurus_ have not yet been allotted, or who may not have _Piraurus_ with them in the camp where they are. This is at all times carried on, and such a man accumulates a lot of property, weapons of all kinds, trinkets, etc., which he in turn gives away to prominent men, heads of totems, and such, and thus adds to his own influence. This is regarded by the Dieri as in no way anything but quite right and proper.[222] The following passages also from Spencer and Gillen's description of the marriage customs of these aborigines show both the nature of the sexual system of these tribes in general and the well-developed nature of both their sexual and their property interest in their women: