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Volume 11(4);  April 1925
The cover of the journal
Chemistry
Researches on Selenium Organic Compounds: V. A Simple Method for the Synthesis of 2-Substituted Benzoselenazoles
Marston Taylor Bogert and Carl Norman Andersen
Proc Natl Acad Sci U S A. 1925 April; 11(4): 217–218.
PMCID: PMC1085924
The Density and Atomic Weight of Helium
Gregory Paul Baxter and Howard Warner Starkweather
Proc Natl Acad Sci U S A. 1925 April; 11(4): 231–234.
PMCID: PMC1085929
Engineering
Determination of the Stresses in a Beam by Means of the Principle of Least Work
William Hovgaard
Proc Natl Acad Sci U S A. 1925 April; 11(4): 209–216.
PMCID: PMC1085923
Mathematics
On the Projective and Equi-Projective Geometries of Paths
Tracy Yerkes Thomas
Proc Natl Acad Sci U S A. 1925 April; 11(4): 199–203.
PMCID: PMC1085920
Projective Normal Coördinates for the Geometry of Paths
Oswald Veblen and Joseph Miller Thomas
Proc Natl Acad Sci U S A. 1925 April; 11(4): 204–207.
PMCID: PMC1085921
Note on the Projective Geometry of Paths
Joseph Miller Thomas
Proc Natl Acad Sci U S A. 1925 April; 11(4): 207–209.
PMCID: PMC1085922
Physics
The Reflection of X-Rays by Alkali Halide Crystals
Alice H. Armstrong, William Duane, and R. J. Havighurst
Proc Natl Acad Sci U S A. 1925 April; 11(4): 218–221.
PMCID: PMC1085925
Note on the Diffraction of X-Rays by a Wedge-Shaped Slit
Irwin Isaac Rabinov
Proc Natl Acad Sci U S A. 1925 April; 11(4): 222–224.
PMCID: PMC1085926
The Compton Effect with Hard X-Rays
D. L. Webster and P. A. Ross
Proc Natl Acad Sci U S A. 1925 April; 11(4): 224–227.
PMCID: PMC1085927
The Heat Capacity of Solid Aliphatic Crystals
E. O. Salant
Proc Natl Acad Sci U S A. 1925 April; 11(4): 227–231.
PMCID: PMC1085928
Journal Matter
Original table of contents page
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