Vol. LXIII. No. 2 JUNE, 1903 



THE 



POPULAR SCIENCE 

 MONTHLY 



(. 



EDITED BY J. MoKEEJf CATTELL V, 



CONTKNTS 



Hertzian "Wave Wireless Telegraphy. Professor J. A. Fleming ... 97 



Physiological Economy in Nutrition. Professor R. H. Chittenden . 123 



The Field of Municipal Hygiene. Professor Edwin 0. Jordan . . . 132 



University Tendencies in America. President David Starr Jordan 141 



The Improvement of the City of Washington 149 



Changes in the Age of College Graduation. W. Scott Thomas . . . 159 



Education not the Cause of Race Decline. Dr. Geo. J. Engelmann . . 172 



Discussion and Correspondence : 



Magazine Science : B. F. L 185 



Scientific Literature : 



Hermann von Helmholtz Igg 



Progress of Science : 



Josiah Willard Gibbs ; The Scientific Program of the Louisiana Purchase Exposition ; 

 Congresses of Physicians ; Scientific Items Igg 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. T. 



NEW YORK : Sub-Station 84 

 Single Number, 30 CENia Yearly Subscription, |3.00 



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