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Volume 6(11);  November 1920
The cover of the journal
Agriculture
A Critical Study of Fertilizer Experiments
C. B. Lipman and G. A. Linhart
Proc Natl Acad Sci U S A. 1920 November; 6(11): 684–686.
PMCID: PMC1084676
Astronomy
New Observations on the Variability of the Sun
C. G. Abbot
Proc Natl Acad Sci U S A. 1920 November; 6(11): 674–678.
PMCID: PMC1084673
Genetics
Homologous Genes and Linear Linkage in Drosophila virilis
Alexander Weinstein
Proc Natl Acad Sci U S A. 1920 November; 6(11): 625–639.
PMCID: PMC1084666
The Mutant Crossveinless in Drosophila Melanogaster
Calvin B. Bridges
Proc Natl Acad Sci U S A. 1920 November; 6(11): 660–663.
PMCID: PMC1084670
Is Crossing Over a Function of Distance?
J. A. Detlefsen
Proc Natl Acad Sci U S A. 1920 November; 6(11): 663–670.
PMCID: PMC1084671
Interspecific Hybrids in Crepis: I. Crepis capillaris (L) Wallr. × C. tectorum L.
E. B. Babcock and J. L. Collins
Proc Natl Acad Sci U S A. 1920 November; 6(11): 670–673.
PMCID: PMC1084672
Mathematics
Semivariants of a General System of Linear Homogeneous Differential Equations
E. B. Stouffer
Proc Natl Acad Sci U S A. 1920 November; 6(11): 645–648.
PMCID: PMC1084668
The Permanent Gravitational Field in the Einstein Theory
L. P. Eisenhart
Proc Natl Acad Sci U S A. 1920 November; 6(11): 678–682.
PMCID: PMC1084674
Physics
The Intensities of X-Rays of the L-Series: III. Critical Potentials of the Platinum and Tungsten Lines
Frank C. Hoyt
Proc Natl Acad Sci U S A. 1920 November; 6(11): 639–644.
PMCID: PMC1084667
Some New Methods in Interior Ballistics
Arthur Gordon Webster
Proc Natl Acad Sci U S A. 1920 November; 6(11): 648–659.
PMCID: PMC1084669
Statistics
A Simpeified Method for the Statistical Interpretation of Experimental Data
George A. Linhart
Proc Natl Acad Sci U S A. 1920 November; 6(11): 682–684.
PMCID: PMC1084675
Journal Matter
Original table of contents page
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