Marsupialia found near Paris that extinct marsupialia had lived there, with this same certainty may we conclude from a system of kinship transmitted by history that the extinct form of the family corresponding to this system was once in existence. The systems of kinship and forms of the family just mentioned differ from the present systems in that every child has several fathers and mothers. Under the American system to which the Hawaiian system corresponds, brother and sister cannot be father and mother of the same child; but the Hawaiian system presupposes a family, in which, on the contrary, this was the rule. We are here confronted by a series of family forms that are in direct contradiction with those that were currently regarded as alone prevailing. The conventional conception knows only monogamy, furthermore polygamy of one man, eventually also polyandry of one woman. But it passes in silence, as is meet for a moralizing philistine, that the practice silently but without compunction supersedes these barriers sanctioned officially by society. The study of primeval history, however, shows us conditions, where men practiced polygamy and women at the same time polyandry, so that their children were considered common to all; conditions that up to their final transition into monogamy underwent a whole series of modifications. These modifications slowly and gradually contract the circle comprised by the common tie of marriage until only the single couple remains which prevails to-day. In thus constructing backward the history of the family, Morgan, in harmony with the majority of his colleagues, arrives at a primeval condition, where unrestricted sexual intercourse existed within a tribe, so that every woman belonged to every man, and vice versa. Much has been said about this primeval state of affairs since the eighteenth century, but only in general commonplaces. It is one of Bachofen's great merits to have taken the subject seriously and to have searched for traces of this state in historical and religious traditions. To-day we know that these traces, found by him, do not lead back to a stage of unlimited sexual intercourse, but to a much later form, the group marriage. The primeval stage, if it really ever existed, belongs to so remote a period, that we can hardly expect to find direct proofs of its former existence among these social fossils, backward savages. Bachofen's merit consists in having brought this question to the fore.[7]