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Excerpt from Archives of Psychology, Vol. 6: 1917-1921 The present investigation was begun in the Psychological Laboratory of the University of California in the spring of 1916. The experiments in which children served as subjects were conducted in a public school in Oakland, California, while those upon adults were, for the most part, carried out in the Psychological Laboratory of Columbia University. The writer has been fortunate in having enjoyed, during the course of the work, endless encouragement, suggestions, and assistance from a large number of people. To Mr. N. Ricciardi, Principal of the school visited, I am indebted for the privilege of conducting the experiments upon his charges as well as for the ready help in arranging details for the work. To the many teachers whose class-rooms I invaded, I am indebted for the kindliest toleration and for a great deal of valuable assistance. My debt of gratitude to Professors G. M. Stratton and Warner Brown of the University of California and to Professors J. McKeen Cattell, R. S. Woodworth, E. L. Thorndike, H. L. Hollingworth, and Dr. A. T. Poffenberger of Columbia University, is very great. To my friend Charles E. Martin, I am indebted for valuable suggestions and criticisms in the preparation of the manuscript. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.