Excerpt from An Introduction to the Theory of Optics I have purposely abstained from entering into details of methods of observation or instrumental appliances. These belong more properly to the courses of laboratory instruction. I hope that the short biographical notices of deceased authors who have made important contributions to the science will be found to be of interest. 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.