Excerpt from A Text-Book of General Astronomy for Colleges and Scientific SchoolsIt has been intended to bring the book well down to date, and to indicate to the student the sources of information on subjects which are necessarily here treated inadequaw on account of the limitations of time and space.Special acknowledgments are due to Professor Langley and to his publishers, Messrs. Ticknor Co., for the use of a number of illustrations from his beautiful book, The New Astronomy and also to D. Appleton 85 Co. For the use of several cuts from the author's little book on the Sun. Pro fossor Trowbridge of Cambridge kindly provided the original negative from which was made the cut illustrating the com parison of the spectrum of iron with that of the sun. Warner Swasey of Cleveland and Fauth Co. Of Washington have also furnished the engravings of a number of astronomical instruments.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.