ANNUAL RECORD 



OF 



SCIENCE AND INDUSTRY 



FOR 1875. 



EDITED BY 



SPENCER F. BAIRD, 



WITH THE ASSISTANCE OF EMINENT MEN OF SCIENCE. 



A. 'a 



1^ % 



s? % 



NEW YORK: 



HARPER & BROTHERS, PUBLISHERS, 



FRANKLIN SQUARE. 



1876. 



