Vol. LXXXIV, No. 3 MARCH, 1914 



THE 



POPULAR SCIENCE 



MONTHLY 



EDITED BY J. McKEEN CATTELL 





CONTENTS 



The Origin of the Flocking Habit of Migratory Birds. Professor C. 0. 



Teowbbidgb 209 



Water. Dr. E. P. Wightman 218 



Psychotherapy in Folk-medicine. Dr. Abeam Lipsky .... 227 



The Struggle for Equality in the United States. Professor Chables F. 



Emebick 235 



The Question of Agricultural Population. Abland D. Weeks . .251 



The Effects of School Life upon the Nutritive Processes, Health and the 

 Composition of the Blood 257 



The Physical Beethoven. Dr. James Fbedebick Bogebb . . . 265 



The World versus Matter. Wm. E. Bitteb 271 



The Automobile and the Public Health. Dr. P. G. Heinemann . . 284 



Tropical Nature in Colombia. Professor A. 8. Peabse .... 290 



The Progress of Science : 



_ Work in Engineering at Haryard University and the Massachusetts Institute of 

 ^ Technology ; Track Scale Testing Equipment of the Bureau of Standards ; Scien- 

 tific Items 307 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. Y. 



NEW YOEK : Sub-Station 84 



Single Number, 30 Cents Yearly Subscription, $3.00 



Copyright, 1913. by THE SCIENCE PRESS 



