< Page:Popular Science Monthly Volume 81.djvu
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624

THE POPULAR SCIENCE MONTHLY

Thorndike, Edward L., The Permanence of Interests and their Relation to Abilities 449
Thought, Modern, Edward F. Williams 133
Trinidad and Bermudez Asphalts and their Use in Highway Construction, Clifford Richardson 19
Trinidad and Bermudez Asphalts and their Use in Highway Construction, Clifford Richardson 170
Turner, Edmund Raymond, The Hindu Arabic Numerals 601

United States, Population of, in 1910 204
⁠"⁠"⁠Agricultural Products of 519
University of Cincinnati, and its Cooperative Engineering Course 100

Valentine, Basil: A Seventeenth-century 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
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