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Volume 14(4);  April 1928
The cover of the journal
Astronomy
On the Distortion of the Continuous Background by Wide Absorption Lines
Cecilia H. Payne
Proc Natl Acad Sci U S A. 1928 April; 14(4): 296–301.
PMCID: PMC1085481
Biology
Studies on Biochemical Differences between Sexes in Mucors: 5. Quantitative Determinations of Sugars in (+) and (-) Races
S. Satina and A. F. Blakeslee
Proc Natl Acad Sci U S A. 1928 April; 14(4): 308–316.
PMCID: PMC1085483
Botany
Dynamic Relations between Plant and Soil, with Special Reference to the Supply of Water and Oxygen
Burton E. Livingston
Proc Natl Acad Sci U S A. 1928 April; 14(4): 293–295.
PMCID: PMC1085480
Chemistry
Photochemical Ozonization and Its Relation to the Polymerization of Oxygen
Oliver R. Wulf
Proc Natl Acad Sci U S A. 1928 April; 14(4): 356–359.
PMCID: PMC1085492
The Shared-Electron Chemical Bond
Linus Pauling
Proc Natl Acad Sci U S A. 1928 April; 14(4): 359–362.
PMCID: PMC1085493
Engineering
A Case of Streaming in a Valve
E. Bodewig
Proc Natl Acad Sci U S A. 1928 April; 14(4): 301–308.
PMCID: PMC1085482
Physics
Reflection of Electrons by a Crystal of Nickel
C. J. Davisson and L. H. Germer
Proc Natl Acad Sci U S A. 1928 April; 14(4): 317–322.
PMCID: PMC1085484
The Limits of Accuracy in Physical Measurements
Arthur Edward Ruark
Proc Natl Acad Sci U S A. 1928 April; 14(4): 322–328.
PMCID: PMC1085485
A Critical Experiment on the Statistical Interpretation of Quantum Mechanics
Arthur Edward Ruark
Proc Natl Acad Sci U S A. 1928 April; 14(4): 328–330.
PMCID: PMC1085486
Direct and Indirect Characteristic X-Rays: Their Ratio as a Function of Cathode-Ray Energy
David L. Webster
Proc Natl Acad Sci U S A. 1928 April; 14(4): 330–339.
PMCID: PMC1085487
K-Electron Ionization by Direct Impact of Cathode Rays
David L. Webster
Proc Natl Acad Sci U S A. 1928 April; 14(4): 339–344.
PMCID: PMC1085488
Analysis of Spectra Arising from Quadruply Ionized Tin, Sn V
R. C. Gibbs and H. E. White
Proc Natl Acad Sci U S A. 1928 April; 14(4): 345–348.
PMCID: PMC1085489
On the Energy and Entropy of Einstein's Closed Universe
Richard C. Tolman
Proc Natl Acad Sci U S A. 1928 April; 14(4): 348–353.
PMCID: PMC1085490
On the Equilibrium between Radiation and Matter in Einstein's Closed Universe
Richard C. Tolman
Proc Natl Acad Sci U S A. 1928 April; 14(4): 353–356.
PMCID: PMC1085491
Journal Matter
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