The Popular Science Monthly 



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



C0NTENT8 OF THE APRIL NUMBER 



The Genesis of the Law of Gravity. Professor John 



C. Shedd. 

 Edward Palmer. William Edward Safford. 

 Freud's Theories of the Unconscious. Professor 



William Chase. 

 Impressions of Military Life in France. Professor 



Albert Leon (Juerard. 

 Reality and Truth. Professor T. D. A. Cockerell. 

 The Cost of Living. Professor Henry Pratt Fair. 



child. 

 Alcohol— Its Use and Abuse: Professor Graham 



LrsK. 

 Scientific versus Personal Distribution of College 



Credits. President William T. Foster. 

 The Progress of Science. 



The Population of the Unite! States in 1910 ; The 



Research Work of the Carnegie Institution ; The 



House of Asa Gray ; Scientific Items. 



CONTENTS OF THE MAY NUMBER 



The Formation of North American Natural Bridges. 

 Professor Herdman F. Cleland. 



Some Weather Proverbs and their Justification. Dr. 

 W. J. Humphreys. 



Science at the Medieval Universities. Dr. James J. 

 Walsh. 



The Search for the Soul in Contemporary Thought. 

 Professor G. T. W. Patrick. 



Progress in Control of Plant Diseases. Dr. F. L. 

 Stevens. 



The Services and the Rewards of the Old Greek Vol- 

 unteers. Dr. Frederic Earle Whitaker. 



Language and Logic. Dr Charles W. Super. 



The Language of the American Indians. Dr. A. L. 

 Kroeber. 



The Progress of Science : 



Circulating Professors ; The Cavendish Labora- 

 tory of Cambridge University ; S«ientific Items. 



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