CBe Popular Science lHomWy 



The Contents of the March Number include the fol 

 lowine articles: 



Aerial Navigation. O. Chanute. 



The Metric System: Shall it be Compul- 

 sory ? Professor W. Le Conte Stevens. 



The Conservation of Energy in Those of 

 Advancing Years. Dr. J. Madison Taylor- 



The Royal Prussian Academy of Science, 

 Berlin. Edward F. Williams. 



The Tropical Station at Cinchona, Jamaica- 

 Dr. N. L. Britton. 



Education and Industry. Professor Edw. 

 D. Jones. 



Evolution Not the Origin of Species. O. F. 

 Cook. 



Some Historical Aspects of Vegetarianism. 

 Professor Lafayette B. Mendel. 



Tokyo Toikoka Dragaku (The Imperial Uni- 

 versity of Tokyo). Nachide Yatsu. 



The Popular Science Monthly has had few rivals and no equal in the 

 educative service it has done for the American people. A complete set of the 

 volumes thus far published is both a history of science for the period covered 

 and at the same time a pretty complete cyclopedia of natural science. 'J'here is 

 nothing to Idl its place, and to carry it on is a benefaction to the public. — W. T. 

 Harris, U. S. Commissioner of Education. 



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g^^THE Popular Science Monthly will l>e sent for six months for 

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