ESTABLISHED BY EDWARD L. YOUMANS. 



THE 



POPULAR SCIENCE 



MONTHLY. 



EDITED BY WILLIAM JAY YOUMANS. 

 VOL. XXXVIII. 



NOVEMBER, 1S90, TO APRIL, 1891. 



^ w New Yowl 



NEW YORK : 



D. APPLETON AND COMPANY, 

 1, 3, and 5 BOND STREET. 



1891. 



^ dtlllHTlTlt r LIBRARY ^ i '' * *" 



