ESTABLISHED BY EDWARD L. YOUMANS. 



THE 



POPULAE SCIENCE 



MOI^THLT 



EDITED BY JVILZrA3I JAY Y0U3IANS. 



VOL. XL. 



NOVEMBER, 1S9J^TQ APRIL, 1892. 



NEW YORK : 



D. APPLETON AND COMPANY, 



1, 3, AOT) 5 BOND STREET. 



1893. 



R 



DONATED nv Twa 



