Solomons where the clan-organisation persists, but where the regulation of marriage by genealogical relationship is equally, if not more, important, the systems of relationship show intermediate characters. Thus, in the island of Florida the mother’s brother was distinguished from the father and there was a term by means of which to distinguish cross-cousins from other kinds of cousin, but the father’s sister was classed with the mother, and it was habitual to ignore the proper term for cross-cousins and to class them in nomenclature with brothers and sisters and with cousins of other kinds, as in the Hawaiian system. One influential man even applied the term for father to the mother’s brother; it was evident that a change is even now in progress which would have to go very little farther to make the Florida system indistinguishable in structure from that of Hawaii. Among the western Papuo-Melanesians of New Guinea, again, the systems of relationship come very near to the Hawaiian type, and with this character there is associated a very high degree of importance of the regulation of marriage by genealogical relationship and a vagueness of clan-organisation. We have here so close a parallelism between two series of social phenomena as to supply as good an example as could be wished of the application of the method of concomitant variations in the domain of sociology. The nature of these changes and their relation to the general cultures of the peoples who use the different forms of terminology show that the transitions are to be associated with a progressive change which has taken place in Oceania. In this part of the world the classificatory system has been the seat of a process of simplification starting from the almost incredible complexity of Pentecost and reaching the simplicity of such systems as those of Eddystone or Mekeo. This process has gone hand in hand with one in which the regulation of marriage by some kind of clan-exogamy has gradually been replaced by a mechanism based on relationship as traced by means of pedigrees.