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Volume 4(5);  May 1918
The cover of the journal
Astronomy
Some Spectral Characteristics of Cepheid Variables
W. S. Adams and A. H. Joy
Proc Natl Acad Sci U S A. 1918 May; 4(5): 129–132.
PMCID: PMC1091419
A Study of the Motions of Forty-eight Double Stars
Eric Doolittle
Proc Natl Acad Sci U S A. 1918 May; 4(5): 137–139.
PMCID: PMC1091422
Mathematics
Invariants Which are Functions of Parameters of the Transformation
Oliver E. Glenn
Proc Natl Acad Sci U S A. 1918 May; 4(5): 145–148.
PMCID: PMC1091424
Physics
Types of Achromatic Fringes
Carl Barus
Proc Natl Acad Sci U S A. 1918 May; 4(5): 132–133.
PMCID: PMC1091420
Interference of Pencils Which Constitute the Remote Divergences from a Slit
Carl Barus
Proc Natl Acad Sci U S A. 1918 May; 4(5): 134–136.
PMCID: PMC1091421
The Structure of an Electromagnetic Field
H. Bateman
Proc Natl Acad Sci U S A. 1918 May; 4(5): 140–145.
PMCID: PMC1091423
Journal Matter
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