Page:Popular Science Monthly Volume 83.djvu/7

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THE

 

POPULAR SCIENCE

 

MONTHLY

 
 
 
 
 
 
EDITED BY

J. McKEEN CATTELL

 
 
 
 
 
 

VOL. LXXXIII

 

JULY TO DECEMBER, 1913

 
 
 
 
 
 

NEW YORK
THE SCIENCE PRESS
1913