Excerpt from Color-Blindness: Its Dangers and Its Detection I have dedicated this volume to my friend Professor Holmgren, because I consider that to him above all others do we owe the present and future control of color-blindness on land and sea, by which life and property are safer, and the risks of travelling less. 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.