The Popular Science Monthly 



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



CONTENTS OF SEPTEMBER NUMBER 



The Development of the Theory of E'ectrolytic Dis- 

 sociation Professor Svante Arrhenius. 



Conservation of Human Energy, Preservation ot 

 Beauty. Dr. J. Madison Taylor. 



Art in Industry. Frank T. Carlton. _, 



Some Plants which Entrap Insects. Forrest Shreve- 



Hebrew, Magyar and Levantine Immigration. Dr. 

 Allen McLaughlin. 



More Men in Public Schools. Richard L. Sandwick. 



A Second Century Criticism of Virgil's Etna. Dr. 

 Charles R. Eastman. 



The Evolution of the Human Hand. 

 Robert MacDoogall. 



Professor 



The Coming International Congress of Arts and Sci- 

 ence at St. Louis. Professor Simon Newcomb. 



The Progress of Science : 



Benjamin Rush ; Gutta-percha and Rubber in the 

 Philippines; Science, War and Politics; Scientific 

 Items. 



CONTENTS OF OCTOBER NUMBER 



The Right Honorable Arthur James Balfour 



Frontispiece. 



A Traveler's View of the British Association Me. ting. 

 President Henry S. Pritchett. 



Reflections suggested by the New Theory of Matter. 

 The Right Honorable Arthur James Balfour. 



The Mathematical PhyMesof the Ninteenth Century. 

 Professor Horace Lamb. 



Heredity and Evolution. William Bateson. 



On the Perception of the Foeee of Gravity by Plants. 

 Profes=or Francis Darwin. 



Henry 

 Douglas W. Fresh- 



The Ethnological Work of Lane Fox 

 Balfour. 



On Mountains and Mankind. 

 field. 



Correlation of Reflexes and the Principle of the 

 Common Path. Professor C. S. Sherrington. 



Invention and Discovery. The Hon. Charles A. 

 Parsons. 



The Progress of Science: 



The Cambridge Meeting 1 of the British Associa- 

 tion for the Advancement of Science; The ad- 

 dress of the President . The work of the Sections. 



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