THE 
POPULAR SCIENCE NEWS 
AND 
BOSTON JOURNAL OF CHEMISTRY. 
DEVOTED TO 
SCIENCE OF HOME-LIFE, THE ARTS, AGRICULTURE, 
AND MEDICINE. 
EDITORS: 
AUSTIN P. NICHOLS. S. B. VV. J. ROLFE, Lirr.D. 
VOLUME XXV. 
January-December, 1891. 
BOSTON: 
THE POPULAR SCIENCE NEWS COMPANY, 
