There is a dualism in organization running through all public assemblies of the Iroquois peoples living under the earlier culture. It must be noted that this dual character of the tribal and league organization does not rest on blood ties or affinity, or on common religious rites, but rather on the motive to dramatize two dominant principles which appear to pervade and energize all observed sentient life. In short, this dualism is based primarily on certain mythic concepts regarding the source of life and the most effective means of conserving it on earth among men. Among the Iroquois people of to-day the knowledge of the reason for the persistent dual organization of tribe and league has been lost completely. But a painstaking analysis of rituals and of certain terms appearing in them gives us a trustworthy clue to the reason for a dualism in organization. The reason thus deduced is the need for embodying in the tribal organic unity the principles of the complementary sexes as organic factors in order to secure fertility and abundant progeny. In short, it was deemed imperative to recognize the male and female principles of the biotic world and all that such recognition implies—fatherhood and motherhood and the duties and obligations arising from these states, as defined in Iroquois thinking. This dualism makes the life of the father and the mother endure with that of the clan of which either is a member. The same is true of sonship and daughtership. This ascription of sex to groups—organic groups—of persons measurably explains the potent motive which underlies the apparently artificial rule of exogamy that controls certain groups of persons as against other like groups of persons. By the prophet-statesmen of the early Iroquois and their cotribesmen the League of the Five Tribes as an institution—as an organic unity—was conceived at times as a bisexed being or person; i. e., as an organic unity formed by the union of two persons of opposite sexes. To those early prophet-statesmen life was omnipresent—obtrusively so, for, unconsciously, their ancestors had imputed it to all bodies and objects and processes of the complex world of human experience. But it must be noted that the life so imputed was human life, no other. And so as an institution the league was conceived as an animate being, endowed with definite biotic properties and functions, as the male and female sexes, fatherhood and motherhood, mind, eyesight, dream power, human blood, and the possession of guardian spirits for its two highest organic members.