APPENDIX
ACKNOWLEDGMENTS
At the suggestion of the publishers, the references which follow have been segregated in an appendix instead of being scattered as footnotes through the text. They felt, rightly enough, I think, that in a book of this character the purpose of the notes was to acknowledge indebtedness for the material cited rather than to support the argument, and that the reader would prefer not to have the text encumbered by the apparatus of a kind of scholarship to which the author makes no pretensions.
While these notes, except in a few instances, refer only to matter actually used in the text, they are also an approximate bibliography of the works which I have consulted. I wish I could adequately acknowledge the obligation I owe to my teachers, William James, George Santayana, and Graham Wallas, though that perhaps is self-evident. I should like to thank Miss Jane Mather and Miss Orrie Lashin for help in the preparation of the manuscript. I am under special obligation to my wife, Faye Lippmann, without whose assistance I could not have completed the book.
W. L.
New York City, January, 1929.