Excerpt from Psychology T1115 unhoped for success which met the present work in the form in which it was printed in 1890 induced me to abstain from making more than a few verbal changes in the second or third editions. But by the time the fourth English edition was called for the large quantity of fresh psychological literature which had appeared, especially from America, in the entire interval, had rendered sundry additions and alterations desirable. The process of emendation once begun it was not easy to draw the line, and the result is that the present volume is practically a new work containing a considerably larger quantity of matter than the former. The limitations of the series have forced me to squeeze many topics into small type, as I was unwilling to omit them altogether. In particular the work recently done by American writers is so important that it has had to be treated fully. 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.