Excerpt from Niagara Through the Stereoscope Experiment for yourself to see the difference between the reports given by your right and your left eye. Hold your right arm out straight before you at full length, the palm toward the left; close your left eye and look with the right eye alone. You see the edge of your hand and a little of the back of the hand. Keep the arm in exactly the same position; close the right eye and look only with the left eye. You see now the edge of the hand and a little of the palm, but not the back. 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.