The Popular Science Monthly 



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



CONTENTS OF THE MARCH NUMBER 



The Origin of the Flocking Habit of Migratory Birds. 

 Professor C. C. Trowbridge. 



Water. Dr. E. P. Wightman. 



Psychotherapy in Folk-medicine. Dr. Abram Lipsky. 



The Struggle for Equality in United States. Pro- 

 fessor Charles F. Emerick. 



The Question of Agricultural Population. Arland 

 D. Weeks. 



The Effects of School Life upon the Nutritive Pro- 

 cesses, Health and the Composition of the Blood. 



The Physical Beethoven. Dr. James Frederick 

 Rogers. 



The World versus Matter. Wm. E. Ritter. 



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

 Heinemann. 



Tropical Nature in Colombia. Professor A. S. Peaise. 



The Progress of Science: 



Work in Engineering at Harvard University and 

 the Massachusetts Institute of Technology ; Track 

 Scale Testing Equipment of the Bureau of Stan- 

 dards; Scientific Items. 



CONTENTS OF THE APRIL NUMBER 



Fresh Air. Professor Frederic S. 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 Americans. 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. 



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