Even when later denominative expression was given to the idea of a generation, terms almost identical of male, old male, and young male are used, as there is no desire to convey any idea of personal kinship, and there is merely in view reference to relativity of age of a class in relation to the group. Later, as Mr. McLennan says (p. 277): ‘Whatever class names primitively signified, Kiki would come to mean child, Kina parent, Moopuna grandchild, Kapuna grandparent, but originally no such idea of kinship was in view.’ The classificatory system evolved itself simply as the result of a desire to define certain rights, and the division by generations was the most natural and feasible for the purpose. But the very simplicity and paucity of the original terms show that it was applied to any simple group form. In fact, we are here dealing with that primitive form which bound people together, by the mere tie of residence and locality, and was purely exogamous in habit. Now when we consider that this fixed relativity of age by generation was originally evolved in view of the relations within such a family, we can imagine that complications might arise from such arbitrary definitions, when, later, this family expanded into the numerically large tribe composed of two intermarrying totem clan groups [phratries]. Primitively, doubtless, as between the classes, the genetic idea as regards sexual matters was (as still with savages in questions of food) to favour the seniors and defend their rights in defining each one’s status. But actually, with the decay of incest, it would become what it is as among lower races, where nothing is more remarkable than the strict interdict upon any union between members of different generations.[9]