624 



THE POPULAR SCIENCE MONTHLY 



Thorndike, Edward L., The Perma- 

 nence of Interests and their Eelation 

 to Abilities, 449 



Thought, Modern, Edward F. Will- 

 iams, 133 



Trinidad and Bermudez Asphalts and 

 their Use in Highway Construction, 

 Clifford Kichardson, 19, 170 



Turner, Edmund Eaymond, The Hindu- 

 Arabic Numerals,' 601 



United States, Population of, in 1910, 

 204; Agricultural Products of, 519 



University of Cincinnati, and its Co- 

 operative Engineering Course, 100 



Valentine, Basil: A Seventeenth-cen- 

 tury Hoax, John Maxson Stillman, 

 591 



Vital Statistics and the Decreasing 

 Death Rate, 617 



Washburn, F. L., Modern Warfare 



against Grasshoppers, 465 

 Williams, Edward F., Modern 



Thought, 133 

 Wilson, Calvin Dill, Negroes .who 



owned Slaves, 483 

 Wind-graved Mesas and their Message, 



Charles R. Keyes, 227 

 World's Most Important Conservation 



Problem, Stewart Paton, 163 



