THE 



POPULAE SOIEN^OE 



MONTHLY. 



CONDUCTED BY E. L. AND W. J. YOUMANS. 



VOL. XXVI. 



NOVEMBER, 1884, TO APRIL, 1885. 



NEW TOEK : 

 D. APPLETON AND COMPANY, 



1, 3, AiTD 5 BOND STREET. 

 1885. 



