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Volume 4(12);  December 1918
The cover of the journal
Astronomy
The Absorption Spectrum of the Novae
W. S. Adams
Proc Natl Acad Sci U S A. 1918 December; 4(12): 355–360.
PMCID: PMC1091495
The Distances of Six Planetary Nebulae
Adriaan van Maanen
Proc Natl Acad Sci U S A. 1918 December; 4(12): 394–396.
PMCID: PMC1091507
Chemistry
Refractive Index and Solubilities of the Nitrates of Lead Isotopes
Theodore W. Richards and Walter C. Schumb
Proc Natl Acad Sci U S A. 1918 December; 4(12): 386–387.
PMCID: PMC1091503
The Purification by Sublimation and the Analysis of Gallium Chloride
Theodore W. Richards, W. M. Craig, and J. Sameshima
Proc Natl Acad Sci U S A. 1918 December; 4(12): 387–388.
PMCID: PMC1091504
The Purification of Gallium by Electrolysis, and the Compressibility and Density of Gallium
Theodore W. Richards and Sylvester Boyer
Proc Natl Acad Sci U S A. 1918 December; 4(12): 388–390.
PMCID: PMC1091505
Genetics
Sex and Sex Intergrades in Cladocera
Arthur M. Banta
Proc Natl Acad Sci U S A. 1918 December; 4(12): 373–379.
PMCID: PMC1091499
Mathematics
On Jacobi's Extension of the Continued Fraction Algorithm
D. N. Lehmer
Proc Natl Acad Sci U S A. 1918 December; 4(12): 360–364.
PMCID: PMC1091496
A Character of Jordan Regions by Properties Having no Reference to Their Boundaries
Robert L. Moore
Proc Natl Acad Sci U S A. 1918 December; 4(12): 364–370.
PMCID: PMC1091497
National Research Council
Minutes of the Meeting of the Executive Board
Paul Brockett
Proc Natl Acad Sci U S A. 1918 December; 4(12): 397–417.
PMCID: PMC1091508
Paleontology
The Phylogeny of the Acorn Barnacles
Rudolf Ruedemann
Proc Natl Acad Sci U S A. 1918 December; 4(12): 382–384.
PMCID: PMC1091501
Possible Derivation of the Lepadid Barnacles from the Phyllopods
John M. Clarke
Proc Natl Acad Sci U S A. 1918 December; 4(12): 384–386.
PMCID: PMC1091502
Physiology
A Biometric Study of Human Basal Metabolism
J. Arthur Harris and Francis G. Benedict
Proc Natl Acad Sci U S A. 1918 December; 4(12): 370–373.
PMCID: PMC1091498
Zoology
On the Method of Progression in Polyclads
W. J. Crozier
Proc Natl Acad Sci U S A. 1918 December; 4(12): 379–381.
PMCID: PMC1091500
The Growth-Rate of Samoan Coral Reefs
Alfred G. Mayor
Proc Natl Acad Sci U S A. 1918 December; 4(12): 390–393.
PMCID: PMC1091506
Journal Matter
Original table of contents page
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