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Volume 13(9);  September 1927
The cover of the journal
Astronomy
The Effect of a Rotation of the Galaxy on Proper Motions in Right Ascension and Declination
Jan Schilt
Proc Natl Acad Sci U S A. 1927 September; 13(9): 642–646.
PMCID: PMC1085161
Chemistry
Some Factors Influencing the Ignition of Carbon Monoxide and Oxygen
A. Keith Brewer
Proc Natl Acad Sci U S A. 1927 September; 13(9): 689–694.
PMCID: PMC1085170
Engineering
Application of the Law of Similitude to Hydraulic Laboratory Research
George de Thierry
Proc Natl Acad Sci U S A. 1927 September; 13(9): 684–688.
PMCID: PMC1085169
Mathematics
Remark on a Theorem of R. L. Moore
B. Knaster and C. Kuratowski
Proc Natl Acad Sci U S A. 1927 September; 13(9): 647–649.
PMCID: PMC1085162
Concerning the Open Subsets of a Plane Continuous Curve
Gordon T. Whyburn
Proc Natl Acad Sci U S A. 1927 September; 13(9): 650–657.
PMCID: PMC1085163
On the Functional Independence of Ratios of Theta Functions
S. Lefschetz
Proc Natl Acad Sci U S A. 1927 September; 13(9): 657–659.
PMCID: PMC1085164
Physics
The Direction of Ejection of X-Ray Electrons
E. C. Watson and J. A. Van den Akker
Proc Natl Acad Sci U S A. 1927 September; 13(9): 659–662.
PMCID: PMC1085165
The Character of the General or Continuous Spectrum Radiation
William Duane
Proc Natl Acad Sci U S A. 1927 September; 13(9): 662–670.
PMCID: PMC1085166
The Structure of the Atmospheric Absorption Bands of Oxygen
G. H. Dieke and Harold D. Babcock
Proc Natl Acad Sci U S A. 1927 September; 13(9): 670–678.
PMCID: PMC1085167
Revision of Rowland's Preliminary Tables of Solar Spectrum Wave-Lengths
Charles E. St. John
Proc Natl Acad Sci U S A. 1927 September; 13(9): 678–683.
PMCID: PMC1085168
Zoölogy
The Interrelation of the Eyes of Palaemonetes as Concerns Retinal Pigment Migration
E. S. Castle
Proc Natl Acad Sci U S A. 1927 September; 13(9): 637–639.
PMCID: PMC1085159
The Blood-Vessels of Annelids
Henry Federighi
Proc Natl Acad Sci U S A. 1927 September; 13(9): 639–641.
PMCID: PMC1085160
Journal Matter
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