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Volume 26(3);  March 15, 1940
Astronomy
Galactic and Extragalactic Studies: VI. Summary of a Photometric Survey of 35,000 Galaxies in High Southern Latitudes
Harlow Shapley
Proc Natl Acad Sci U S A. 1940 March 15; 26(3): 166–176.
PMCID: PMC1078027
Chemistry
Studies in Calcium Metabolism with the Aid of Its Induced Radioactive Isotope: I
W. Wesley Campbell and David M. Greenberg
Proc Natl Acad Sci U S A. 1940 March 15; 26(3): 176–180.
PMCID: PMC1078028
Mathematics
A Decomposition of Compact Continua and Related Theorems on Fixed Sets under Continuous Transformations
J. L. Kelley
Proc Natl Acad Sci U S A. 1940 March 15; 26(3): 192–194.
PMCID: PMC1078030
Minimal Surfaces Spanning Closed Manifolds
R. Courant and N. Davids
Proc Natl Acad Sci U S A. 1940 March 15; 26(3): 194–199.
PMCID: PMC1078031
On Cauchy's Integral Theorem and on the Law of the Mean for Non-Derivable Functions
Guido Fubini
Proc Natl Acad Sci U S A. 1940 March 15; 26(3): 199–204.
PMCID: PMC1078032
Recalculation and Extension of the Modulus and of the Logarithms of 2, 3, 5, 7 and 17
Horace S. Uhler
Proc Natl Acad Sci U S A. 1940 March 15; 26(3): 205–212.
PMCID: PMC1078033
The Green's Function for a Differential System of Infinite Order
D. V. Widder
Proc Natl Acad Sci U S A. 1940 March 15; 26(3): 213–215.
PMCID: PMC1078034
Theorems in the Inverse Problem in the Calculus of Variations
Jesse Douglas
Proc Natl Acad Sci U S A. 1940 March 15; 26(3): 215–221.
PMCID: PMC1078035
Pathology and Bacteriology
Some Biological Effects of Nuclear Disintegration Products on Neoplastic Tissue
P. Gerald Kruger
Proc Natl Acad Sci U S A. 1940 March 15; 26(3): 181–192.
PMCID: PMC1078029
Physiology and Biochemistry
Further Studies on the Parthenogenetic Activation of Rabbit Eggs
Gregory Pincus and Herbert Shapiro
Proc Natl Acad Sci U S A. 1940 March 15; 26(3): 163–165.
PMCID: PMC1078026
Zoölogy and Anatomy
The Experimental Production of Melanin Pigment on the Lower Surface of Summer Flounders (Paralichthys Dentatus)
Clinton M. Osborn
Proc Natl Acad Sci U S A. 1940 March 15; 26(3): 155–161.
PMCID: PMC1078024
A Respiratory Pigment from the Eggs of a Marine Worm
N. H. Horowitz
Proc Natl Acad Sci U S A. 1940 March 15; 26(3): 161–163.
PMCID: PMC1078025
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