ESTABLISHED BY EDWAKD L. YOUMANS. 



THE 



POPULAR SCIENCE 



MONTHLY. 





^;; **»*■* 



EDITED BY WILLIAM JAY YOUMANS. 



Mercantile Library, 



NEW YORK. 



VOL. XLII. 



NOVEMBER, 1892, TO APRIL, 1893. 



NEW YORK : 



D. APPLETON AND COMPANY, 

 1, 3, and 5 BOND STREET. 



1893. 





