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Volume 3(7);  July 1917
The cover of the journal
Astronomy
A Search for an Einstein Relativity-Gravitational Effect in the Sun
Charles E. St. John
Proc Natl Acad Sci U S A. 1917 July; 3(7): 450–452.
PMCID: PMC1091286
Studies of Magnitude in Star Clusters: VII. A Method for the Determination of the Relative Distances of Globular Clusters
Harlow Shapley
Proc Natl Acad Sci U S A. 1917 July; 3(7): 479–484.
PMCID: PMC1091292
The Principal Axes of Stellar Motion
H. Raymond
Proc Natl Acad Sci U S A. 1917 July; 3(7): 485–490.
PMCID: PMC1091293
Chemistry
The Molecular Weights of the Triarylmethyls
M. Gomberg and C. S. Schoepfle
Proc Natl Acad Sci U S A. 1917 July; 3(7): 457–464.
PMCID: PMC1091288
Geology
The Structure of High-Standing Atolls
W. M. Davis
Proc Natl Acad Sci U S A. 1917 July; 3(7): 473–479.
PMCID: PMC1091291
Mathematics
The Cayleyan Curve of the Quartic
Teresa Cohen
Proc Natl Acad Sci U S A. 1917 July; 3(7): 447–450.
PMCID: PMC1091285
Triads of Transformations of Conjugate Systems of Curves
Luther Pfahler Eisenhart
Proc Natl Acad Sci U S A. 1917 July; 3(7): 453–457.
PMCID: PMC1091287
Physics
The Crystal Structure of Magnesium
A. W. Hull
Proc Natl Acad Sci U S A. 1917 July; 3(7): 470–473.
PMCID: PMC1091290
Zoology
Sex-Determination and Sex-Differentiation in Mammals
Frank R. Lillie
Proc Natl Acad Sci U S A. 1917 July; 3(7): 464–470.
PMCID: PMC1091289
Journal Matter
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