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 appear to us as determined entirely by psychological necessity that leads to a uniform evolution the world over. We rather see that each cultural group has its own unique history, dependent partly upon the peculiar inner development of the social group, and partly upon the foreign influences to which it has been subjected. There have been processes of gradual differentiation as well as processes of leveling down differences between neighboring cultural centers, but it would be quite impossible to understand, on the basis of a single evolutionary scheme, what happened to any particular people. An example of the contrast between the two points of view is clearly indicated by a comparison of the treatment of Zuñi civilization by Frank Hamilton Gushing on the one hand, on the other by modern students, particularly by Elsie Clews Parsons, A. L. Kroeber and Leslie Spier. Gushing believed that it was possible to explain Zuñi culture entirely on the basis of the reaction of the Zuñi mind to its geographical environment, and that the whole of Zuñi culture could be explained as the development which followed necessarily from the position in which the people were placed. Cushing’s keen insight into the Indian mind and his thorough knowledge of the most intimate life of the people gave great plausibility to his interpretations. On the other hand, Dr. Parsons’ studies prove conclusively the deep influence which Spanish ideas have had upon Zuñi culture, and, together with Professor Kroeber’s investigations, give us one of the best examples of acculturation that have come to our notice. The psychological explanation is entirely misleading, notwithstanding its plausibility, and the historical study shows us an entirely different picture, in which the unique combination of ancient traits (which in themselves are undoubtedly complex) and of European influences, have brought about the present condition.

Studies of the dynamics of primitive life also show that an assumption of long continued stability such as is demanded by Elliot Smith is without any foundation in fact. Wherever primitive conditions have been studied in detail, they can be proved to be in a state of flux, and it would seem that there is a close parallelism between the history of language and the history of general cultural development. Periods of stability are followed by periods