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Excerpt from The Study of Stellar Evolution, Vol. 10: An Account of Some Recent Methods of Astrophysical Research I wish to express my thanks to Sir William Huggins; to Messrs. Adams, Ellerman, Olmsted, and'ritchey of the Mount Wilson Solar Observatory; to Professors Barnard, Burnham, and Frost Of the Yerkes Observatory; to Professor Campbell Of the Lick Observatory; to Professor Pickering of Harvard College Observatory; to Mr. Abbot Of the Smith sonian Astrophysical Observatory; to Professor Lord Of the Emerson mcmillin Observatory; and to Professor Ames, Mr. Jewell Of Johns Hopkins University, for photographs which appear in the plates. I am also indebted to the Astrophysical Journal and the Publications of the Yerkes Observatory for many cuts, and to Messrs. Ticknor co. For permission to reproduce Langley's drawing Of a typical sun-spot. I am under special Obligations to my colleague, Mr. Ellerman, to whom are due most of the photographs Of instruments, buildings, and landscapes which appear in the plates, besides many of the solar and'stellar photographs taken from our joint papers in the Astrophysical Journal and elsewhere. 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.