ANNUAL RECORD 



OF 



SCIENCE AND INDUSTRY 



FOR 1874. 



EDITED BY 



SPENCER F. BAIKD, 



WITH THE ASSISTANCE OF EMINENT MEN OF SCIENCE. 





-> 



* ;V ~ J 1 



I / | 



NEW YORK: 



HARPER & BROTHERS, PUBLISHERS, 



FRANKLIN SQUARE. 



1875. 



