Vol. LXXXIIL No. 3 SEPTEMBER 1913 



THE 



POPULAR SCIENCE 

 MONTHLY 



EDITED BY J. McKEEN CATTELL 



CONTENTS 



The Nitrate Fields of Chile. Dr. Waler S. Tower . . . .209 

 The Power of Growth in Plants. George E. Stone .... 231 

 The Absorption and Emission Centers of Light and Heat. Dr. W. W. 



Strong 240 



In Quest of the Alcohol Motive. Professor G. T. W. Patrick . . 249 



The Next College President. A Near Professor 265 



The Matter of College Entrance Requirements. President Frank L. 



McVey 286 



The Lesson of Canal Zone Sanitation. Dr. J. S. Lankford . . . 294 



A Biological Forecast. Professor G. H. Parker 300 



The Progress of Science : 



Wharf -pile Fauna in a Museum Group ; The International Medical Congress; Scien- 

 tific Items 307 



THE SCIENCE PRESS 



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Sarair Number, 30 Cents Yearly Subscription, $3.00 



Copykight, 1912, BY THE SCIENCE PRESS 



