The Popular Science Monthly 



Entered in the Post Office in Lancaster, Pa., as second-class matter. 



CONTENTS OF THE SEPTEMBER NUMBER 



The Nitrate Fields of Chile. Dr. Walter S. Tower. 

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

 The Absorption and Emission Centers 01 Light and 

 Heat. Dr. W. W. Strong. 



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

 Patrick. 



The Next College President A Near Professor. 



The Matter of College Entrance Requirements. Pro- 

 fessor Frank L. McVey. 



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

 Lankford. 



A Biological Forecast. Professor G. H. Parker. 



The Progress of Science : 



Wharf-pile Fauna in a Museum Group : The In- 

 ternational Medical Congress ; Scientific Items. 



CONTENTS OF THE OCTOBER NUMBER 



Immigration and The Public Health. Dr. Alfred C. 

 Reed. 



An Irish Channel Railway. Henry Grattan Tyrell. 

 Scientific Standards for the Governmental Regulation 

 of Foods. Dr. J9hn R. Murlin. 



A Problem in Educational Eugenies. Professor 

 Chas. W. Hargitt. 



The Psychological Factor in Southern Race Problems. 

 Dr. James Bardin. 



Women in Industry. R. Malcolm Keir. 



The Fourth Dimension. Professor Samuel M. Barton. 



Some Psychological Problems emphasized by Prag- 

 matism. Professor Josiah Royce. 



The Progress of Science : 



The Presidential Address before the British 

 Association; Professor Ehrlich and Chemio- 

 therapy ; Scientific Items. 



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