Similarly, as shown by Sir J.G.Frazer in _Totemism and Exogamy_, there is often a special name for the mother's brother when other uncles or aunts are addressed simply as father or mother.

This name must therefore have been brought into existence to distinguish the mother's brother at the time when, under the system of female descent, he stood in the relation of a protector and parent to the child.

Where the names for grandfather and grandmother are a form of duplication of those for father and mother as in English, they would appear to imply a definite recognition of the idea of family descent.

The majority of the special names for other relatives, such as fraternal and maternal uncles and aunts, must also have been devised to designate those relatives in particular, and hence there is a probability that the terms for father and brother and sister, which on _a priori_ grounds may be considered doubtful, were also first applied to real or putative fathers and brothers and sisters.

But, as already seen, under the classificatory system of relationship these same terms are addressed to members of the same clan who might by age and sex have stood in such a relationship to the person addressing them, but are not actually akin to him at all.