ESTABLISHED BY EDWARD L. YOUMANS. 



THE 



POPULAE SCIElSrCE 



MONTHLY. 



EDITED BY WILLIAM JAY YOUMANS. 



VOL. XLVI. 



NOVEMBER, 1894, TO APRIL, 1895. 



D. APPLETON AND COMPANY, 



72 FIFTH AVENUE. 



1895. 



