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Volume 13(4);  April 1927
The cover of the journal
Astronomy
On the Correction to Saha's Formula for Small Deviations from Thermodynamic Equilibrium
B. P. Gerasimovič
Proc Natl Acad Sci U S A. 1927 April; 13(4): 180–185.
PMCID: PMC1084922
Chemistry
Chemical Constants and Absolute Entropy
Worth H. Rodebush
Proc Natl Acad Sci U S A. 1927 April; 13(4): 185–188.
PMCID: PMC1084923
On Chemical Activation by Collisions
Richard C. Tolman, Don M. Yost, and Roscoe G. Dickinson
Proc Natl Acad Sci U S A. 1927 April; 13(4): 188–192.
PMCID: PMC1084924
A Case of Negative Catalysis in a Homogeneous System
Alfred C. Robertson
Proc Natl Acad Sci U S A. 1927 April; 13(4): 192–197.
PMCID: PMC1084925
On the Determination of the Apparent Diameters of the Ions in the Debye-Hückel Theory of Strong Electrolytes
T. H. Gronwall
Proc Natl Acad Sci U S A. 1927 April; 13(4): 198–202.
PMCID: PMC1084926
Engineering
Bending of a Quasi-Ellipsoidal Shell with Special Reference to Rigid Airships
William Hovgaard
Proc Natl Acad Sci U S A. 1927 April; 13(4): 256–263.
PMCID: PMC1084939
Influence of Iron Content on Mortar Strength
H. Walter Leavitt and John W. Gowen
Proc Natl Acad Sci U S A. 1927 April; 13(4): 263–265.
PMCID: PMC1084940
Genetics
Nucleus and Cytoplasm in Relation to Differential Pollen-Tube Growth
R. A. Brink and C. R. Burnham
Proc Natl Acad Sci U S A. 1927 April; 13(4): 238–242.
PMCID: PMC1084935
Abnormalities in Pollen-Tube Growth in Datura Due to the Gene “Tricarpel”
J. T. Buchholz and A. F. Blakeslee
Proc Natl Acad Sci U S A. 1927 April; 13(4): 242–249.
PMCID: PMC1084936
Magenta-Alpha—A Third Frequently Mutating Character in Drosophila Virilis
M. Demerec
Proc Natl Acad Sci U S A. 1927 April; 13(4): 249–253.
PMCID: PMC1084937
Pollen-Tube Growth in Lythrum Salicaria
Dontcho Kostoff
Proc Natl Acad Sci U S A. 1927 April; 13(4): 253–255.
PMCID: PMC1084938
Mathematics
On the Expansion of Harmonic Functions in Terms of Harmonic Polynomials
J. L. Walsh
Proc Natl Acad Sci U S A. 1927 April; 13(4): 175–180.
PMCID: PMC1084921
Physics
New Infra-Red Absorption Bands of Methane
Joseph W. Ellis
Proc Natl Acad Sci U S A. 1927 April; 13(4): 202–207.
PMCID: PMC1084927
On the Nature of Light
Ernest O. Lawrence and J. W. Beams
Proc Natl Acad Sci U S A. 1927 April; 13(4): 207–212.
PMCID: PMC1084928
Bands in the Extreme Ultra-Violet Spectrum of a Helium Discharge
L. A. Sommer
Proc Natl Acad Sci U S A. 1927 April; 13(4): 213–216.
PMCID: PMC1084929
White-Light Interference Fringes with a Thick Glass Plate in One Path: Part II
W. N. Birchby
Proc Natl Acad Sci U S A. 1927 April; 13(4): 216–221.
PMCID: PMC1084930
Molecular Space Array in Liquid Primary Normal Alcohols: The Cybotactic State
G. W. Stewart and Roger M. Morrow
Proc Natl Acad Sci U S A. 1927 April; 13(4): 222–223.
PMCID: PMC1084931
Pinhole Probe Measurements with Massive Cylindrical Air Columns
Carl Barus
Proc Natl Acad Sci U S A. 1927 April; 13(4): 223–227.
PMCID: PMC1084932
Atomic Lattices and Atomic Dimensions
Jared Kirtland Morse
Proc Natl Acad Sci U S A. 1927 April; 13(4): 227–232.
PMCID: PMC1084933
The Magnetic Dipole in Undulatory Mechanics
Paul S. Epstein
Proc Natl Acad Sci U S A. 1927 April; 13(4): 232–237.
PMCID: PMC1084934
Journal Matter
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