Altogether the most satisfactory means of removing a girl from her group is to purchase her. The use of property in the acquisition of women is not a particular expression of the male nature, since property is accumulated by females as well; but where this form of marriage exists it means practically that the male relatives of the girl are using her for profit, and that her suitor is seeking more complete control of her than he can gain in her group; and viewed in this light the purchase and sale of women is an expression of the dominant nature of the male. In consequence of purchase, woman became in barbarous society a chattel, and her socially constrained position in history and the present hindrances to the outflow of her activities are to be traced largely to the system of purchasing wives. The simplest form of purchase is to give a woman in exchange. "The Australian male almost invariably obtains his wife or wives either as the survivor of a married elder brother or in exchange for his sisters, or, later in life, for his daughters."[142] A wife is also often sold on credit, but kept at home until the price is paid. On the island of Serang a youth belongs to the family of the girl, living according to her customs and religion until the bride-price is paid. He then takes both wife and children to his tribe. But in case he is very poor, he never pays the price, and remains perpetually in the tribe of his wife.[143] Among the Kwakiutl Indians of British Columbia the maternal has only barely given way to the paternal system, and the form of marriage reflects both systems. The suitor sends a messenger with blankets, and the number sent is doubled within three months, making in all about one hundred and fifty. These are to be returned later. He is then allowed to live with the girl in her father's house. Three months later the husband gives perhaps a hundred blankets more for permission to take his wife home.[144] Among the Makassar and Beginese stems of Indionesia the purchase of a wife involves only a partial relinquishment of the claim of the maternal house on the girl; the purchase price is paid by instalments and all belongs to the mother's kindred in case full payment is not made. A compromise between the two systems is made on the Molucca Islands, where children born before the bride-price is paid belong to the mother's side, after that to the father's.[145]