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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. W. J. ROLFE, Lirr.D. 
VOLUME XXIV. 
January- December, 1890. 
BOSTON: 
THE POPULAR SCIENCE NEWS COMPANY, 
