In the preparation of Chapters II, III, and VI of this book I have drawn on a University of California syllabus, “Three Essays on the Antiquity and Races of Man”; for Chapter VII, on an article “Heredity, Environment, and Civilization” in the _American Museum Journal_ for 1918; and Chapter V makes use of some passages of “The Languages of the American Indians” from the _Popular Science Monthly_ of 1911. In each case there has been revision and for the most part rewriting. Whatever quality of lucidity the volume may have is due to several thousand young men and women with whom I have been associated during many years at the University of California. Without their unwitting but real co-author…
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