Vol. LXIV. No. 5 MARCH, 1904 



THE 



POPULAR SCIENCE 

 MONTHLY 



EDITED BY J. McKEEX CATTELL 



COKTKNTS 



Aerial I^avigation. 0. Chanute 385 



The Metric System : Shall it be Compulsory ? Professor W. Le Conte 



Stevens 394 



The Conservation of Energy in Those of Advancing Years. Dr. J. 



Madison Taylor 406 



The Royal Prussian Academy of Science, Berlin. Edward F. Wil- 

 liams 415 



The Tropical Station at Cinchona, Jamaica. Dr. N. L. Britton . . 427 



Education and Industry. Professor Edw. D. Jones 481 



Evolution Not the Origin of Species. 0. F. Cook . 445 



Some Historical Aspects of Vegetarianism. Professor Lafayette B. 

 Mfndel 457 



Tokyo Teikoku Diagaku (Imperial University of Tokyo). Nao- 

 eide Yatsu 466 



The Progress of Science : 



Immannel Kant ; Recent Progress in the Study of Radioactivity ; New Buildings 



for the Department of Agriculture iu Washington ; Scientific Items 474 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. Y. 



NEW YORK : Sub-Station 84 

 Single Numbee, 30 Cents Yearly Subsckiption, |3.00 



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