This system of kinship is not only fully accepted by all American Indians as well as by the aborigines of India, the Dravidian tribes of Deckan and the Gaura tribes of Hindostan, but similar systems must have existed everywhere primarily, as has been proven by investigations that were undertaken since those of Backofen. When these established facts shall be taken as a basis for further investigations among living savage or barbaric tribes, similar to the investigations made by Backofen among various peoples of the ancient world, by Morgan among the Iroquois and by Cunow among the Australian Negroes, it will be shown that social and sex relations constituted the foundation for the development of all nations of the world. Morgan’s investigations have revealed still other interesting facts. While the “pairing family” of the Iroquois is in contradiction to the terms of relationship employed by them, it was shown that in the Sandwich Islands (Hawaii) there existed up to the first half of the nineteenth century a family form which actually corresponded to that system of kinship that among the Iroquois existed only in name. But the Hawaiian system of kinship again did not agree with the family form prevailing there at the time, but pointed to another form of the family, still more remote, and no longer in existence. There all the children of brothers and sisters, without exception, were regarded as brothers and sisters, and were considered the common children, not only of their mother’s and her sisters’ or their father’s and his brothers’, but of all the brothers and sisters of both their parents. The Hawaiian system of kinship then corresponded to a degree of development that was still lower than the prevailing family form. We are thus confronted by the peculiar fact, that in Hawaii as among the North American Indians, two different systems of kinship were employed that no longer corresponded to existing conditions, but had been superseded by a higher form. Morgan expresses himself on this phenomenon in the following manner: “The family is the active element; it is never stationary, but progresses from a lower to a higher form in the same measure in which society develops from a lower to a higher stage. But the systems of kinship are passive. Only in long intervals they register the progress made by the family in course of time, and only then are they radically changed when the family has done so.”