ALBERT H. N. BARON
Albert Heyem Nachmen Baron translation
FELLOW IN CLARK UNIVERSITY
LONDON KEGAN PAUL, TRENCH, TRÜBNER & CO., Ltd. 1906
COPYRIGHT BY The Open Court Publishing Co. CHICAGO, U. S. A. 1906 All rights reserved.
To the Memory of My Teacher and Friend,
Arthur Allin, Ph. D., professor of psychology and education, university of colorado,
who first interested me in the problems of psychology, this book is dedicated, with reverence and gratitude, by
The Translator.