ANNUAL 



OF 



SCIENTIFIC DISCOVERY: 



OR, 



YEAR-BOOK OF FACTS IN SCIENCE AND ART 



FOR 1868, 



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 1867 J A LIST 



OF RECENT SCIENTIFIC PUBLICATIONS; OBITUARIES OF 



EMINENT SCIENTIFIC MEN, ETC. 



EDITED BY 



SAMUEL KNEELAND, A.M., M.D., 



FELLOW OF THE AMERICAN ACADEMY OF ARTS AND SCIENCES, SECRETARY OF AND INSTRUC- 

 TOR IN ZOOLOGY AND PHYSIOLOGY IN THE MASSACHUSETTS INSTITUTE 



OF TECHNOLOGY, ETC. 



BOSTON : 



G-OTJL33 A.N 13 L I IN" C O IL, IST, 



59 WASHINGTON STREET. 



NEW YORK: SHELDON AND COMPANY. 



CINCINNATI: GEO. S. BLANCHAKD & CO. 



LONDON : TllUBNER it CO. 



1 8 G 8. 



