actual existence of which cannot be proved any more, but which must have existed, because otherwise such a system of kinship could not have arisen. According to Morgan, the family is the active element; it is never stationary, but in progression 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. "And," adds Marx, "it is the same with political, juridical, religious and philosophical systems in general." While the family keeps on growing, the system of kinship becomes ossified. The latter continues in this state and the family grows beyond it. With the same certainty which enabled Cuvier to conclude from some bones of 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.