Before entering into the matter ourselves, we must keep in mind our affirmation as to the axiom which must, in my opinion, guide us in all research into the hidden causes of early social evolution. All innovations, as we have said, in the regulation of society, all novel legislative procedure so to speak, will be found to have relation to the sexual feelings in jealousy. This already is the genesis of the primal law, and, in each case of avoidance, we have found jealousy the leading factor. It is the same in the case before us. Bearing this in mind, let us then follow Mr. McLennan’s advice as to seeking the origin of the classification of connected persons. Now what would be the family economy of the primitive group, and who are its component individuals, whose interests, in sexual matters, are likely to clash, and whose mutual relationship in this respect demanded distinction in furtherance of regulation of their respective rights? The original primitive type of family, which we have called ‘the Cyclopean,’ has disappeared, giving place to a higher form, which, by the inclusion of male offspring, has permitted the existence of several generations in presence. The component individuals, speaking of one sex only, would be old males, males, and young males representing three generations. It is the interests of these generations, which, in sexual matters and in choice of food, &c. would be likely to clash, for we may be sure that the seniors, as with actual savages, would desire the lion’s share. Distinction then being necessary, it would naturally, as with individuals, be based on relativity of age, seniority within certain limits confering priority. Thus gradually each generation, as indeed with actual lower races, would, _qua_ generation, come to be a distinctly defined class with certain separate rights and obligations. In this simple necessity of a classification of the connected persons, we see the origin of the classificatory system itself, as an institution. Divers interests, as between seniors and juniors, demanded strict demarcation, and the limits of a generation furnished the required lines to mark them. The very natural distinction by relativity of age was simply, as with individuals, utilised as the requisite machinery in regulation of mutual rights of the individual himself. His rights are a matter of concern simply within his generation, in which the relation is purely paternal and communal, with the sole reservation of rights conferred by seniority.