ANNUAL 



OF 



17 



SCIENTIFIC DISCOVERY 



O R, 



YEAR-BOOK OF FACTS IN SCIENCE AND ART, 



FOE, 1871,' 



EXHIBITING THE 



MOST IMPORTANT DISCOVERIES AND IMPROVEMENTS 



IN 



MECHANICS, USEFUL ARTS, NATURAL PHILOSOPHY, CHEMISTRY, 



ASTRONOMY, GEOLOGY, BIOLOGY, BOTANY, MINERALOGY, 



METEOROLOGY, GEOGRAPHY, ANTIQUITIES, ETC., 



TOGETHER WITH 



NOTES ON THE PROGRESS OF SCIENCE DURING THE YEAR 1870; A LIST 



OF RECENT SCIENTIFIC PUBLICATIONS; OBITUARIES OF 



EMINENT SCIENTIFIC MEN, ETC. 



EDITED BY 



JOHN TROWBRIDGE, S.B., 



ASSISTANT PROFESSOR OF PHYSICS IN HARVARD COLLEGE; 



AIDED BY 



W. R. NICHOLS, 



ASST. PROF. OF CHEJI1STUY IN MASS. INST. OF TECHNOLOGY; 



AND 



C. R. CROSS, 



GRADUATE OF THE INSTITUTE. 



OSTON : 



G-OTJIj-D ^ IN" ID IL, I IN" C O L IN" , 



59 WASHINGTON STREET. 



NEW YORK: SHELDON AND COMPANY. 



LONDON: TRUBNER & co. 

 1871. 



