I offer my thanks to several friends who have been kind enough to read the proofs of this book, and to send me corrections and suggestions; among whom I will mention Professors John Adams and J.H. Muirhead, Dr. A. Wolf, and Messrs. W.H. Winch, Sidney Webb, L. Pearsall Smith, and A.E. Zimmern. It is, for their sake, rather more necessary than usual for me to add that some statements still remain in the text which one or more of them would have desired to see omitted or differently expressed. I have attempted in the footnotes to indicate those writers whose books I have used. But I should like to record here my special obligation to Professor William James's _Principles of Psychology_, which …
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