D.C.; by Frederick J. V. Skiff, director of the Field Columbian Museum, Chicago, and by the author. Ethnological collections and the best illustrative works on ethnological subjects scattered throughout the country have been carefully searched for material.

I wish to take this opportunity to express my gratitude to Professor Dewey for the suggestions he has given me with reference to this series, and to acknowledge that without the inspiration that has come through his teaching I should probably never have undertaken a work of this kind. To Dr. W. I. Thomas, professor of sociology and anthropology in the University of Chicago, I am indebted for suggestions upon anthropological phases of many of the subjects presented. To Dr. S. W. Williston, professor of paleontology in the University of Chicago, I am indebted for a careful examination of the book from the standpoint of the paleontologist. Among the many friends who have given me help and inspiration, I would mention especially, Professor Ella Flagg Young, of the University of Chicago; Superintendent F. A. Manny, of the Ethical Culture Schools, New York City; Mrs. Charlotte W. Williams, of Chicago; my sister, Miss Elspa M. Dopp, of the State Normal School, St. Cloud, Minn.; and Mr. W. W. Charters, of the University of Chicago. To the late Director J. W. Powell, of the United States Bureau of Ethnology, and to Director Frederick J. V. Skiff, of the Field Columbian Museum, Chicago, I am under obligations for courtesies extended which have enabled me to gain access to illustrative materials.

K. E. D.