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Rh system is nothing more than a body of mutual salutations and terms of address. They have failed to see that it still remains necessary to explain how the terms of the classificatory system came to be used in mutual salutation. They have failed to recognise that they were either rejecting the principle of determinism in sociology, or were only putting back to a conveniently remote distance the consideration of the problem how and why the classificatory terms came to be used in the way now customary among so many peoples of the earth.

This aspect of the problem, which has been neglected or put on one side by the followers of McLennan, was not so treated by McLennan himself. As we should expect from the general character of his work, McLennan clearly recognised that the classificatory system must have been determined by social conditions, and he tried to show how it might have arisen as the result of the change from the Nair to the Tibetan form of polyandry. He even went so far as to formulate varieties of this process by means of which there might have been produced the chief varieties of the classificatory system, the existence of which had been demonstrated by Morgan. It is quite clear that McLennan had no doubts about the necessity of tracing back the social institution of the classificatory system of relationship to social causes, a necessity which has been ignored or even explicitly