ESTABLISHED BY EDWARD L. YOUMANS. 



THE 



POPULAE SCIENCE 



MONTHLY. 



EDITED BY WILLIAM JAY YOUMANS. 



VOL. XLIV. 



NOVEMBER, 1893, TO APRIL, 1894. 



NEW YORK : 

 D. APPLETON AND COMPANY, 



1, 3, AND 5 BOND STREET. 

 1894. 



