ANNUAL 



OP 



SCIENTIFIC DISCOVERY: 



OB, 



YEAR-BOOK OF FACTS IN SCIENCE AND ART, 



FOE, 18 70, 



EXHIBITING THB 



MUST larORTANT DISCOVERIES AND IIPEDVEIENTS 



IN 



MECHANICS, USEFUL ARTS, NATURAL PHILOSOPHY, CHEMISTRY, 



ASTRONOMY, GEOLOGY, BIOLOGY, BOTANY, MINERAI.OGY, 



METEOROLOGY, GEOGRAPHY, ANTIQUITIES, ETC., 



TOGETHER WITH 



NOTES ON THE PROGRESS OF SCIENCE DURING THE YEAR 1869; A LIST 



OF RECENT SCIENTIFIC PUBLICATIONS; OBITUARIES OF 



EMINENT SCIENTIFIC MEN, ETC. 



EDITED BY 



JOHN TROWBRIDGE, S.B., 



ASSISTANT FBOFSSSOR OF PHYSICS IN THK MASSACHUSETTS INSTITUTE OF TKCHKOLOOT ; 



AIDED BY 



SAMUEL KNEELAND, M.D., 



PEOFESSOE OF ZOOLOGY XSD PHYSIOLOGY IN THE INSTITUTE; 



AND 



W. E. NICHOLS, 



OBADUATE OF THB INSTITUTE. 



BOSTON : 



53 WASHINGTON 8TBEET. 



NEW YORK: SHELDON AND COMPANY. 



LONDON : trObner & CO. 

 18 70. 



