Vol. LVIL] <- [No. 2. 



THE© 



POPULAR SCIENCE 

 MONTHLY. 



JUNE, 1900. *M Y )\ 



EDITED BY J. MoKEEJV CATT$LL. 



CONTENTS: 



Professor Wolcott Gibbs, President of the National Academy of 



Science. (Frontispiece.) k 114 



Preventive Inoculation. (1.) Dr. W. M. Haffkine 115 



Professor Ewart's Penycuik Experiments. (Illustrated.) 126 



Colonies and the Mother Country. (1.) James Collier 139 



The Future of the Negro in the United States. Professor N. S. 



-Shaler 147 



The Physical Geography of the Lands. Professor W. M. Davis 157 



The New York Botanical Garden. (Illustrated.) Dr. D. T. Macdougal. 171 



Gas and Gas Meters. (Illustrated) Hubert S. Wtnkoop 179 



The Sun's Destination. Professor Harold Jacoby 191 



A Biographical Sketch of an Infant. Charles Darwin 197 



Correspondence : 



Comparative Longevity and Greatness. Pbofessok Joseph Jastrow. School 

 Reform 206 



Scientific Literature : 



Chemistry ; Zoology ; Botany ; Anthropology .">. 213 



The Progress of Science : 



The Retiring President of the National Academy; The Work of the Academy; 

 The American Association; An International Assembly; A National Physical 

 Laboratory ; The Promotion of Men of Science; Recent Deaths ; The Solidifica- 

 tion of Hydrogen; Chemical Fertilization ; The Approaching Eclipse 219 



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Copyright, 1900, by McCLURE, PHILLIPS & COMPANY. 

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