Vol. LXXII. No. 5- MAY, 1908 



THE 



POPULAR SCIENCE 

 MONTHLY. 



EDITED BY J. McKEEN CATTELL 

 CONTENTS 



Some New View Points in Nutrition. Professor Etjssell H. Chittenden 385 

 The Utilization of Auxiliary Entomophagous Insects in the Struggle 



against Insects Injurious to Agriculture. Professor Paul March al 406 



Of the Soil of the Earth. Spencer Trotter 420 



The Conservation of the Great Marine Vertebrates : — Imminent Destruc- 

 tion of the Wealth of the Seas. Dr. G. R. Wieland 425 



The Whiter Pittsburgh. John F. Cargill 431 



The Education of the Colored Race is the Duty of the Nation. Professor 



Harris Hancock 452 



Should Psychology supervise Testimony? Fabian Franklin .... 465 

 The Progress of Science : 



The Carnegie Foundation for the Advancement of Teaching and the State Universi- 

 ties; The Vegetation of the Salton Sea; John Samuel Budgett; Scientific Items . 475 



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