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Volume 25(1);  January 1939
The cover of the journal
Astronomy
The Physical State of the Interstellar Gas Clouds
Otto Struve
Proc Natl Acad Sci U S A. 1939 January; 25(1): 36–43.
PMCID: PMC1077703
Botany
Vitamin B6, a Growth Substance for Excised Tomato Roots
William J. Robbins and Mary Bartley Schmidt
Proc Natl Acad Sci U S A. 1939 January; 25(1): 1–3.
PMCID: PMC1077695
Chemistry
Experiments on the Relation of Nutrition to the Composition of the Body and the Length of Life
H. C. Sherman, H. L. Campbell, and C. S. Lanford
Proc Natl Acad Sci U S A. 1939 January; 25(1): 16–20.
PMCID: PMC1077700
Genetics
The Induction by Irradiation with Neutrons of Hereditary Changes in Mice
George D. Snell
Proc Natl Acad Sci U S A. 1939 January; 25(1): 11–14.
PMCID: PMC1077698
Imaginal Differentiation Inaugurated by Oxygen in Drosophila Pupae
Dietrich Bodenstein
Proc Natl Acad Sci U S A. 1939 January; 25(1): 14–16.
PMCID: PMC1077699
Mathematics
Groups of Degree n in Which the Largest Degree of a Substitution is a Minimum
G. A. Miller
Proc Natl Acad Sci U S A. 1939 January; 25(1): 43–46.
PMCID: PMC1077704
Euler's Concordant Forms
E. T. Bell
Proc Natl Acad Sci U S A. 1939 January; 25(1): 46–48.
PMCID: PMC1077705
On the Mapping of Abstract Spaces on Polytopes
S. Lefschetz
Proc Natl Acad Sci U S A. 1939 January; 25(1): 49–50.
PMCID: PMC1077706
The Intrinsic Metric of a Polytope
John W. Tukey
Proc Natl Acad Sci U S A. 1939 January; 25(1): 51.
PMCID: PMC1077707
On the Concept of a Topological Space
J. W. Alexander
Proc Natl Acad Sci U S A. 1939 January; 25(1): 52–54.
PMCID: PMC1077708
Physics
Photomicrographs of Thin Bone Sections by the Use of Fluorescence X-Radiation
Elmer Dershem
Proc Natl Acad Sci U S A. 1939 January; 25(1): 6–10.
PMCID: PMC1077697
Physiology and Biochemistry
Chemical Restoration in Nitella: III. Effects of Inorganic Salts
W. J. V. Osterhout and S. E. Hill
Proc Natl Acad Sci U S A. 1939 January; 25(1): 3–6.
PMCID: PMC1077696
Psychology and Anthropology
The Resolution of Tests into Two General Factors
Edwin B. Wilson and Jane Worcester
Proc Natl Acad Sci U S A. 1939 January; 25(1): 20–25.
PMCID: PMC1077701
The Steady Polarity Potential of the Human Eye
Walter R. Miles
Proc Natl Acad Sci U S A. 1939 January; 25(1): 25–36.
PMCID: PMC1077702
Journal Matter
Original table of contents page
Administrative content — journal masthead, notices, indexes, etc.
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