WE THANK YOU

¶ To the following men and women we wish to express our appreciation for their share in the production of this book:

To Duren J. H. Ward, Ph. D.,
formerly of the Anthropology Department of Harvard University, who,
as the discoverer of the fourth human type, has added immeasurably
to the world's knowledge of human science.

To Raymond H. Lufkin,
of Boston, who made the illustrations for this volume
scientifically accurate.

To The Roycrofters,
of East Aurora, whose artistic workmanship made it into a thing of
beauty.

And last but not least,

To Sarah H. Young,
of San Francisco, our Business Manager, whose efficiency correlated
all these and placed the finished product in the hands of our
students.

THE AUTHORS

New York City,
June, 1921

DEDICATED
TO
OUR STUDENTS