Excerpt from Multiple Personality: An Experimental Investigation Into the Nature of Human Individuality The work Of Parts I and III covers a period of eight years. Out of the material accumulated by Dr. Sidis and his collaborators, some experiments and observations of functional psychopathic cases have been utilized in the last part of this volume. Another portion of the work of Parts I and III has been accomplished in the Psycho pathological Laboratory of the New York Infirmary for Women and Children, and sincere thanks are therefore due to the Trustees and especially to Dr. Alexander Lambert and Julia B. De Forest. 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.