On the whole, the race is singularly uniform in its physical traits, and individuals taken from any part of the continent could easily be mistaken for inhabitants of numerous other parts. * * * * * * The culture of the native Americans strongly attests the ethnic unity of the race. This applies equally to the ruins and relics of its vanished nations, as to the institutions of existing tribes. Nowhere do we find any trace of foreign influence or instruction, nowhere any arts or social systems to explain which we must evoke the aid of teachers from the eastern hemisphere. * * * * American culture, wherever examined, presents a family likeness which the more careful observers of late years have taken pains to put in a strong light. This was accomplished for governmental institutions and domestic architecture by Lewis H. Morgan, for property rights and the laws of war by A. F. Bandelier, for the social condition of Mexico and Peru by Dr. Gustav Bruhl, and I may add for the myths and other expressions of the religious sentiment by myself. * * * The psychic identity of the Americans is well illustrated in their languages. There are indeed indefinite discrepancies in their lexicography and in their surface marphology; but in their logical sub-structure, in what Willhelm von Humboldt called the "inner form," they are strikingly like. The points in which this is especially apparent are in the development of pronominal forms, in the abundance of generic particles, in the overweening preference for concepts of action (verbs) rather than concepts of existence (nouns), and in the consequent subordination of the latter to the former in the proposition. [41] Following the same general line of thought Nadaillac says: