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Volume 26(7);  July 15, 1940
Astronomy
HD 167362, an Object Similar to Campbell's Hydrogen Envelope Star
P. Swings and O. Struve
Proc Natl Acad Sci U S A. 1940 July 15; 26(7): 454–458.
PMCID: PMC1078208
The Spectrum of RW Hydrae
P. Swings and O. Struve
Proc Natl Acad Sci U S A. 1940 July 15; 26(7): 458–461.
PMCID: PMC1078209
Botany
Traumatic Acid and Thiamin as Growth Factors for Algae
J. Van Overbeek
Proc Natl Acad Sci U S A. 1940 July 15; 26(7): 441–443.
PMCID: PMC1078204
Some Trabeculate Codiums (Including Two New Species)
William Albert Setchell
Proc Natl Acad Sci U S A. 1940 July 15; 26(7): 443–448.
PMCID: PMC1078205
Chemistry
Studies in Mineral Metabolism with the Aid of Induced Radioactive Isotopes: IV—Manganese
David M. Greenberg and W. Wesley Campbell
Proc Natl Acad Sci U S A. 1940 July 15; 26(7): 448–452.
PMCID: PMC1078206
Genetics
A REVERSION TO WILD-TYPE ASSOCIATED WITH CROSSING-OVER IN DROSOPHILA MELANOGASTER
C. P. Oliver
Proc Natl Acad Sci U S A. 1940 July 15; 26(7): 452–454.
PMCID: PMC1078207
Mathematics
Compound Multiplicative Diophantine Systems
E. T. Bell
Proc Natl Acad Sci U S A. 1940 July 15; 26(7): 462–466.
PMCID: PMC1078210
On Laguerre Series
Robert E. Greenwood, Jr.
Proc Natl Acad Sci U S A. 1940 July 15; 26(7): 466–471.
PMCID: PMC1078211
Equilong and Conformal Transformations of Period Two
Edward Kasner and John De Cicco
Proc Natl Acad Sci U S A. 1940 July 15; 26(7): 471–476.
PMCID: PMC1078212
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