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Volume 5(1);  January 1919
The cover of the journal
Chemistry
The Inorganic Constituents of Lobster Shells
Frank Wigglesworth Clarke and George Steiger
Proc Natl Acad Sci U S A. 1919 January; 5(1): 6–8.
PMCID: PMC1091513
The Ternary System CaO-MgO-SiO2
J. B. Ferguson and H. E. Merwin
Proc Natl Acad Sci U S A. 1919 January; 5(1): 16–18.
PMCID: PMC1091515
Genetics
Quantitative Relations Between Chromatin and Cytoplasm in the Genus Arcella, with their Relations to External Characters
R. W. Hegner
Proc Natl Acad Sci U S A. 1919 January; 5(1): 19–22.
PMCID: PMC1091516
Mathematics
A Theorem on Power Series, with an Application to Conformal Mapping
T. H. Gronwall
Proc Natl Acad Sci U S A. 1919 January; 5(1): 22–24.
PMCID: PMC1091517
Paleontology
On Some Fundamentals of Pre-Cambrian Paleo-Geography
Rudolf Ruedemann
Proc Natl Acad Sci U S A. 1919 January; 5(1): 1–6.
PMCID: PMC1091512
Zoology
Flagellate Affinities of Trichonympha
Charles Atwood Kofoid and Olive Swezy
Proc Natl Acad Sci U S A. 1919 January; 5(1): 9–16.
PMCID: PMC1091514
Journal Matter
Original table of contents page
Administrative content — journal masthead, notices, indexes, etc.
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