ascribed to the absence of interest in the subject induced by their adherence to McLennan's primary error. Those who believe that the classificatory system is merely an unimportant code of mutual salutations are not likely to attend to relatively minute differences in the customs they despise. The credit of having been the first fully to recognise the social importance of these differences belongs to J. Kohler. In his book "Zur Urgeschichte der Ehe," which I have already mentioned, he studied minutely the details of many different systems, and showed that they could be explained by certain forms of marriage practised by those who use the terms. I propose now to deal with classificatory terminology from this point of view. My procedure will be first to show that the details which distinguish different forms of the classificatory system from one another have been directly determined by the social institutions of those who use the systems, and only when this has been established, shall I attempt to bring the more general characters of the classificatory and other systems into relation with social institutions.
I am able to carry out this task more fully than has hitherto been possible because I have collected in Melanesia a number of systems of relationship which differ far more widely from one another than those recorded in Morgan's book or others which have been collected since. Some of the features which characterise these Melanesian systems will be wholly new to ethnologists, not having yet been
