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Rh to be found in Melanesia, as in the western Solomons, which closely resemble that of Hawaii, while there are Polynesian systems, such as those of Tonga and Tikopia, which are so like those of Melanesia that, if they had occurred there, they would have attracted no special attention. The difference between the two kinds of system is not to be correlated with any difference of race.

Next, if we take Melanesian and Polynesian systems as a whole, we find that they do not fall into two sharply marked-off groups, but that there are any number of intermediate gradations between the two. It would be possible to arrange the classificatory systems of Oceania in a series in which it would not be possible to draw the line at any point between the different varieties of system which the two ends of the series seem to represent. The question arises whether it is possible to find any other series of transitions in Oceania which runs parallel with the series connecting the two varieties of system of relationship. There is no doubt but that this question can be answered in the affirmative. Speaking broadly, there are two main varieties of social organisation in Oceania, with an infinite number of intermediate conditions. In one variety marriage is regulated by some kind of clan-exogamy, including under the term "clan" the moieties of a dual organisation; in the other variety marriage is regulated by kinship or genealogical relationship. We know of no part of Melanesia