ESTABLISHED BY EDWARD L. YOUMANS. 



THE 



POPULAR SCIENCE 



MONTHLY. 



KIEV VCM 



EDITED BY WILLIAM JAY YOUMANS. 



VOL. XLI. 



MAY TO OCTOBER, 1892. 



MERCANTftE LIBRARY 



MEW YORK. 



NEW YORK : 



D. A PPL ETON AND COMPANY, 



1, 3, and 5 BOND STREET. 



1892. 



R 



