A similar case is afforded by the Shoshonean stock. Within this family specific terms for father and mother as opposed to uncles and aunts are the rule and cross-cousins are generally not distinguished from parallel cousins and brothers. There is thus a combination of extreme Hawaiian inclusiveness in the speaker’s generation with the tendency to non-classificatory nomenclature in the first ascending generation. But among the Hopi, the only member of the group organized into exogamous clans, the Dakota principle holds sway. Since no Southwestern system is known that so clearly reveals the forked and merging principle, the possibility of borrowing seems barred and we have proof of the independent evolution of this feature in correlation with a clan system. So far, then, as the distribution of the Dakota principle over discontinuous regions of the globe is concerned, the hypothesis of exogamy gives a reasonably satisfactory explanation of the facts, while within each continuous area we shall assume a greater or lesser degree of dissemination. Applying this, _e. g._, to the Northwestern Indians as a whole, we shall indeed regard the evolution of Dakota features as a response to the exogamous organization, but when we turn to the three exogamous tribes individually, we shall face the problem whether the terminology did not spread from one tribe to its two neighbors. It is quite true that theoretically there is the possibility that the _clan_ system, not the terminology, was the diffused feature and that the organization in each case independently produced an appropriate nomenclature. However, we have undoubted instances in which features of nomenclature were not associated with any social institution, indeed, where the very words have been borrowed. Further the development of an appropriate terminology is not an absolutely automatic process, as is shown by the failure of some tribes with exogamy to develop one. Hence it seems probable that within a limited continuous area the Dakota principle developed only once and then spread to neighboring tribes. That the existence of an exogamous organization among the borrowers would be a favorable condition for the adoption of the nomenclature is obvious, also that the organization and the terminology may be borrowed jointly.