ESTABLISHED BY EDWARD L. YOUHANS. 



THE 



' POPULAR SCIENCE 



MONTHLY. 



EDITED BY WILLIAM JAY YOUMANS. 



VOL. XLIII. 



MAY TO OCTOBER, 1893. 



NEW YORK : 



D. APPLETON AJfD COMPANY, 

 1, 3, and 5 BOND STREET. 



1893. 



1 



