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Volume 19(7);  July 1933
The cover of the journal
Astronomy
On the Interpretation of Nova Spectra
Donald H. Menzel and Cecilia H. Payne
Proc Natl Acad Sci U S A. 1933 July; 19(7): 641–648.
PMCID: PMC1086128
Genetics
Chromosome Number and Morphology in Nicotiana VI: Chromosome Numbers of Forty Species
Thomas Harper Goodspeed
Proc Natl Acad Sci U S A. 1933 July; 19(7): 649–653.
PMCID: PMC1086129
Geology
Young's Modulus and Poisson's Ratio with Reference to Geophysical Applications
W. A. Zisman
Proc Natl Acad Sci U S A. 1933 July; 19(7): 653–665.
PMCID: PMC1086130
Compressibility and Anisotropy of Rocks at and near the Earth's Surface
W. A. Zisman
Proc Natl Acad Sci U S A. 1933 July; 19(7): 666–679.
PMCID: PMC1086131
Comparison of the Statically and Seismologically Determined Elastic Constants of Rocks
W. A. Zisman
Proc Natl Acad Sci U S A. 1933 July; 19(7): 680–686.
PMCID: PMC1086132
Mathematics
The General Case of Non-Homogeneous Linear Differential Equations
W. J. Trjitzinsky
Proc Natl Acad Sci U S A. 1933 July; 19(7): 687–690.
PMCID: PMC1086133
A Canonical Form for a Set of Vectors
M. S. Knebelman
Proc Natl Acad Sci U S A. 1933 July; 19(7): 691–696.
PMCID: PMC1086134
On a Theorem of Fejér
W. C. Randels
Proc Natl Acad Sci U S A. 1933 July; 19(7): 697–699.
PMCID: PMC1086135
Paleontology
Aristogenesis, the Observed Order of Biomechanical Evolution
Henry Fairfield Osborn
Proc Natl Acad Sci U S A. 1933 July; 19(7): 699–703.
PMCID: PMC1086136
Pathology
Electrosmosis and Anomalous Osmosis
David R. Briggs
Proc Natl Acad Sci U S A. 1933 July; 19(7): 704–710.
PMCID: PMC1086137
Physics
Note on the Sturm-Liouville Eigenvalue-Eigenfunction Problem with Singular End-Points
Edwin C. Kemble
Proc Natl Acad Sci U S A. 1933 July; 19(7): 710–714.
PMCID: PMC1086138
Physiology
Studies on the Growth Hormone of Plants: III. The Inhibiting Action of the Growth Substance on Bud Development
Kenneth V. Thimann and Folke Skoog
Proc Natl Acad Sci U S A. 1933 July; 19(7): 714–716.
PMCID: PMC1086139
Studies on the Growth Hormone of Plants: IV. On the Mechanism of the Action
James Bonner
Proc Natl Acad Sci U S A. 1933 July; 19(7): 717–719.
PMCID: PMC1086140
The Energy of Urea Synthesis: II. The Effect of Varying Hydrogen Ion Concentration with Different Metabolites
Henry Borsook and Geoffrey Keighley
Proc Natl Acad Sci U S A. 1933 July; 19(7): 720–725.
PMCID: PMC1086141
On the Temperature-Regulatory Function of “Spontaneous” Activity in the Mouse
T. J. B. Stier
Proc Natl Acad Sci U S A. 1933 July; 19(7): 725–729.
PMCID: PMC1086142
The Development of Temperature Regulation in the Mouse
G. Pincus, G. DeRoo Sterne, and E. Enzmann
Proc Natl Acad Sci U S A. 1933 July; 19(7): 729–733.
PMCID: PMC1086143
Psychology
The Influence of Use or Frequency of Occurrence upon the Strength of Mental Connections
Edward L. Thorndike
Proc Natl Acad Sci U S A. 1933 July; 19(7): 734–745.
PMCID: PMC1086144
Zoölogy
The Effects of the Pituitary Hormones on the Melanophores of Fishes
J. M. Odiorne
Proc Natl Acad Sci U S A. 1933 July; 19(7): 745–749.
PMCID: PMC1086145
The Occurrence of Guanophores in Fundulus
J. M. Odiorne
Proc Natl Acad Sci U S A. 1933 July; 19(7): 750–754.
PMCID: PMC1086146
Photic Stimulation and Rhythmical Contractions of the Mantle Flaps of a Lamellibranch
John H. Welsh
Proc Natl Acad Sci U S A. 1933 July; 19(7): 755–757.
PMCID: PMC1086147
Journal Matter
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