Vol. fcVIIL No. 6. APRIL, 1901. 



THE 



POPULAR SCIENCE 



MONTHLY. 



a 



EDITED BY J. McKEEJf CATTELL. 



CONTENTS : 



Malpighi, Swammerdam and Leeuwenhoek. Professor William A. 

 Locy 561 



Two Contemporary Problems in Education. Professor Paul H. 

 Hanus 585 



A Study of British Genius. Havelock Ellis 595 



Suicide and the Weather. Professor Edwin G. Dexter 604 



Recent Progress in Aerial Navigation. Charles H. Cochrane 616 



The Foreign Trade of the United States. Frederic Emory 625 



The Planet Eros. Professor Solon I. Bailey 641 



Discussion and Correspondence : 



What Chicago University Stands For : Eugene Pabsons. The Population of the 

 United States during the Next Ten Centuries : Chas. E. Woodruff, U. S. A. 

 Origin of Men of Genius : Pkesident Chas. W. Super 652 



Scientific Literature : 



Kant and the Nebular Hypothesis ; Knowledge and Belief ; Malaria in Italy ; 

 Botany ; Travel and Exploration 659 



The Progress of Science : 



Stanford University and Academic Freedom ; The Royal Engineering College ; 

 The Association of Universities ; The National Bureau of Standards ; Other Legis- 

 lation by Congress ; The New Star in Perseus ; Other New Stars and their Origin ; 

 The Investigation of Agricultural Soils ; Scientific Items 663 



Index to Volume LVIII 669 



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