Excerpt from Sight: An Exposition of the Principles of Monocular and Binocular Vision Part III is the part in which I difier most funda mentally from some noted authorities. I have there fore gone over this part again carefully and verified every point, so that I feel more than ever confident Of its substantial truth. I have also added in this part a chapter on the form Of phantom planes under certain conditions. This chapter is an admirable illustration of some principles previously set forth. I have rewritten and greatly enlarged the chapter on the comparative physiology of binocular vision, and added also a final chapter on the evolution of the eye. 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.