Excerpt from Annual Record of Science and Industry for 1876 Fifth, an extremely minute alphabetical index of authors and subjects. Sixth, a systematic and analytical table of contents, by means of which reference can readily be made to whatever the volume contains, bearing upon any particular line of inquiry. Seventh, in compliance with a generally expressed wish, the names of the authors of the different portions of the Scientific Summary are given for the first time in the present volume of the Record, in connection with their respective communications, all of them men occupying the front rank in America as authors and investigators. Other collaborators not contributors to the first division of the volume are Professor 0. F. Himes, of Dickinson College, Carlisle, Pa. Professor F. W. Clarke, of the University of Cincinnati; Professor E. D. Cope, of Philadelphia; Profess or F. V. Hayden; Major J. W. Powell; Lieutenant George M. Wheeler, U. S. A., and several others who prefer to re main unmentioned. It will be readily understood that the present volume is prepared for the general public, who desire to become acquainted with the more prominent steps of advancement during the year, without the trouble of resorting to the sources of original information concerning the same. Specialists may find little or nothing in it to merit their attention, and, indeed, they may naturally be inclined to criticise the work for not being more complete. It must be borne in mind, however, that the work is limited in extent, and that, in view of the enormous subdivision of labor at present in the line of scientific investigation, any attempt at exhaustiveness would involve a vast increase in the size of the book. At the present time there is scarcely a branch of science which is without one or more journals as its organs and an annual record devoted exclusively to its history; and to these reference should be made for more minute information. It is hoped, however, that but little of general or popular interest has been overlooked. In the selection for the Scientific Bibliography the editor has been chiefly guided by the commendatory no tices which have appeared in the more prominent scientific journals of the day, and references to the pages of the journals wherein the works catalogued and reviewed are given. As the journals in question are generally easily accessible, the reader is thus furnished with a trustworthy guide in his selection of books. 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.