like those of the Sioux, Muskoki, Algonquin, Shoshoni, Salish, and Athapascan. Secondly, we must make a detailed study of the distribution of phonetic, grammatical, and lexicographical phenomena, the latter including also particularly the principles on which the grouping of concepts is based. Finally, our study ought to be directed not only to an investigation of the similarities of languages, but equally intensively towards their dissimilarities. Only on this basis can we hope to solve the general historical problem.
Columbia University,
New York City
