Vol. LXVIII. No. 6 JUNE, 1906 



THE 



POPULAR SCIENCE 

 MONTHLY. 



EDITED BY J. McKEEN CATTELL 

 CONTENTS 



Concerning Variations in Animals and Plants. President David Starr 

 Jordan 431 



The Human Side of the Indian. Dr. Alexander F. Chamberlain . . 503 



The Fresh-water Fishes of South and Middle America. Professor C. II. 



Eigenmann 515 



Facts about Nostrums. Dr. Horatio Wood, Jr 531 



Times and Places of Earthquakes. Professor H. H. Turner .... 536 



Radio-activity and Volcanoes. Major C. E. Dutton 542 



An Eclipse Expedition to Spain. Dr. A. S. Mitchell 550 



Shorter Articles : 



The Spanish American Type. Dr. Gustave Michaud .... 563 



The Progress of Science : 



The Earthquake on the California Coast ; The Engineering Building of New York 

 City; The Carnegie Foundation for the Advancement of Teaching ; Scientific Items 565 



Index to Vol. LXVIII 571 



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