The Popular Science Monthly 



Entered in (he Post Office in Lancaster, Pa., at second-class matter. 



CONTENTS OF THE APRIL NUMBER 



Fresh Air. Professor Frederic 8. Lee. 



Nature Play. Professor Charles Lincoln Edwards. 



Recent Developments in Weights and Measures in 

 the United States. Louis A. Fischer. 



The Struggle for Equality in the United States. Pro- 

 fessor Charles F. Emerick. 



Eugenics and Euthenics. Professor Maynard M. 

 Metcalf. 



The Psychological Limit of Eugenics. Professor 

 Herbert Adolphus Miller. 



The Racial Origin of Successful Americana. Dr. 

 Frederick Adams Woods. 



Darwin and Wallace on Sexual Selection and Warn- 

 ing Coloration. Professor F. H. Pike. 



The Progress of Science : 



Mortality Statistics of the United States; The 

 Work in Terrestrial Magnetism of the Carnegie 

 Institution ; Scientific Items. 



CONTENTS OF THE MAY NUMBER 



The Measurement of Environic Factors and their 

 Biologic Effects. Dr. D. T. MaoDougal. 



The Theory of Relativity and the New Mechanics. 

 Professor William Marshall. 



The Small College and Its President. One of Its Pro- 

 fessors. 



Labor and Capital. Professor John J. Stevenson. 



The Struggle for Equality in the United States. Pro- 

 fessor Charles F. Emerick. 



Science in Newspapers. Dr. J. A. Udden. 



The Science of History. Professor Clarence Wal- 

 worth Alvord. 



The Practical Necessity of School Clinics. Dr. E. H. 

 Lewinski-Corwin. 



The Laboratory of Comparative Pathology of the 

 Zoological Society of Philadelphia. Dr. R. W. 

 Shufeldt. 



The Progress of Science: 



The American Museum of Natural History; The 

 Marvels of Science; Quarantine of Hawaiian 

 Fruit; Scientific Items. 



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