Vol. LXV. No. 5 SEPTEMBER, 1904 



THE 



POPULAR SCIENCE 

 MONTHLY 



EDITED BY J. McKEEJV C ATT ELL 



CO NTKNTS 



The Development of the Theory of Electrolytic Dissociation. Professor 

 Svante Arrhenius 385 



Conservation of Human Energy, Preservation of Beauty. Dr. J. Madi- 

 son Taylor 397 



Art in Industry. Frank T. Carlton 414 



Some Plants which Entrap Insects. Forrest Shreve 417 



Hebrew, Magyar and Levantine Immigration. Dr. Allen McLaughlin 432 



More Men in Public Schools. Richard L. Sandwich: 443 



A Second Century Criticism of Virgil's Etna. Dr. Charles R. Eastman 452 



The Evolution of the Human Hand. Professor Robert MacDougall . 457 



The Coming International Congress of Arts and Sciences at St. Louis . 466 



The Progress of Science : 



Benjamin Kush ; Gutta percha and Rubber in the Philippines ; Science, War and 

 Politics ; Scientific Items 474 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. Y. 



NEW YORK : Sub-Station 84 

 Single Numbee, 30 Cents Ye ably Subscription, $3.06 



COPYBIGHT, 19<M, BY THE SCIENCE PRESS 



