ESTABLISHED BY EDWARD L. YOUMANS. 



THE 



POPULAE SCIENCE 



MONTHLY. A 



jLiJ L 







EDITED BY WILLIAM J. Y0U3IAKS. 

 VOL. XXXIV. 



NOVEMBER, 1888, TO APRIL, 1889. 



NEW YORK : 



D. APPLETON AND COMPANY, 



1, 3, ANT) 5 BOND STREET. 



1889. 



