But even after the development had reached its final form and limited totemic exogamy was completely established, further changes ensued. For the basis of such exogamy, we may conjecture, is the fact that certain totem groups of associated clans enjoy particularly close relations with one another. Even on these primitive levels, however, the friendships of such groups are not absolutely permanent any more than are the political friendships of modern civilized states, though their degree of permanence is probably greater than that of the latter. Migrations, changes in hunting-grounds, and other conditions, were doubtless operative also in totemic culture, loosening the bonds between friendly totems and cementing others in their stead. This led to changes in the exogamous relations of totem groups. Instead of groups _n_ and _r_ of clans A and B, _n_ and _q_ might then come to have exogamous connections (see diagram III on p. 148). But the severance of the old connection did not immediately obliterate the tradition of the former relationship. The influence of the latter would naturally continue to be felt, not in connection with acts of a transitory nature, such as wooing and marriage, but in matters _permanent_ in character and thus affecting the traditional organization of the tribe. Such a permanent relation, however, is _totem affiliation_. This explains how it happens that, even after the old totem connection gave way to the new, it nevertheless continued to exercise a claim on the totem membership of the children born under the new marriage conditions; hence also the recognition of the claim on the part of custom. In _one_ respect, indeed, such recognition was impossible. More firmly established than any form of exogamy was the law that children belonged to the mother, or, in the case of paternal descent, to the father. This law could not be violated. Hence _exogamous_ and _parental_ tribal membership became differentiated. The latter ordained that children in every case belong to the totem of the parent who determines descent; the tradition of the former decreed that children belong, not to the parental totem, but to some other totem of the same clan. Such a condition of dual totem membership might, of course, arise from a great variety of conditions, just as may the similarly overlapping social relations within our own modern culture--such, for example, as the military and the so-called civil station of a man. The customary designation of the first two forms of limited exogamy as exogamy with direct maternal descent, and of the third as exogamy with indirect maternal descent, is plainly inappropriate and may easily give rise to misunderstandings. For it may suggest that the maternal totem disposes of its rights in respect to marriage arrangements to another totem group, and that eventually this even occurs in accordance with a definite agreement. But this is certainly not the case. For maternal descent or, speaking more generally, the fact that children belong to the parents, obtains invariably. It would be preferable, therefore, simply to distinguish the parental totem connection from the traditional exogamous connection, or one system in which the exogamous and the parental connections coincide, from a second in which they differ.