The subject of group-marriage is one about which I do not find it possible to speak so dogmatically. It would take me more than another lecture to deal adequately with the Melanesian evidence alone, and I must content myself with two remarks. Firstly, I think it desirable to throw aside the term group-marriage as only confusing the issue, and to speak rather of a state of organised sexual communism, in which sexual relations are recognised as orthodox between the men of one social group and the women of another. Secondly, the classificatory system has several features which would follow naturally from such a condition of sexual communism. I have evidence from Melanesia which places beyond question the former presence of such a condition, with features of culture which become readily explicable if they be the survivals of such a state of sexual communism as is suggested by the terminology of the classificatory system. This evidence comes from only one part of the world, but it is enough to convince me that we have no right to dismiss from our minds a state of organised sexual communism as a feature of the social development of mankind. The wide distribution of the classificatory system would suggest that this communism has been very general, but it need not have been universal, and even if the widespread existence of organised sexual communism be established, it would not follow that it represents the earliest stage in the evolution of human society. There are certain features even of the classificatory system itself which suggest that, if this system be founded in sexual communism, this communism was not primitive, but grew out of a condition in which only such ties of kinship were recognised as would result from the social institution of the family. I must be content with this brief reference to the subject. The object of these lectures is to demonstrate the dependence of the terminology of relationship upon social conditions, and the dependence of the classificatory system upon a condition of sexual communism is not now capable of demonstration. The classificatory mode of denoting relationship should, however, act as a suggestion and stimulus, and as a preventative of dogmatic statement in a part of our subject which, in spite of its entrancing interest, still lies only at the edge of our slowly spreading circle of exact knowledge.