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Volume 9(4);  April 1923
The cover of the journal
Chemistry
The Significance of the Experimentally Determined Crystal Structures of the Alkali Polyhalides
George L. Clark
Proc Natl Acad Sci U S A. 1923 April; 9(4): 117–122.
PMCID: PMC1085294
The Critical and Dissociation Potentials of Hydrogen
A. R. Olson and George Glockler
Proc Natl Acad Sci U S A. 1923 April; 9(4): 122–126.
PMCID: PMC1085295
Genetics
The Reduction Division in Haploid, Diploid, Triploid and Tetraploid Daturas
John Belling and A. F. Blakeslee
Proc Natl Acad Sci U S A. 1923 April; 9(4): 106–111.
PMCID: PMC1085292
The Variation and Inheritance of Milk Characters
Tage Ellinger
Proc Natl Acad Sci U S A. 1923 April; 9(4): 111–116.
PMCID: PMC1085293
Mathematics
Concerning the Cut-Points of Continuous Curves and of Other Closed and Connected Point-sets
Robert L. Moore
Proc Natl Acad Sci U S A. 1923 April; 9(4): 101–106.
PMCID: PMC1085291
Physics
The Reflection by a Crystal of X-Rays Characteristic of Chemical Elements in It
George L. Clark and William Duane
Proc Natl Acad Sci U S A. 1923 April; 9(4): 126–130.
PMCID: PMC1085296
On the Abnormal Reflection of X-Rays by Crystals
George L. Clark and William Duane
Proc Natl Acad Sci U S A. 1923 April; 9(4): 131–135.
PMCID: PMC1085297
Electric Conduction: Hall's Theory and Perkins' Phenomenon
Edwin Bidwell Wilson
Proc Natl Acad Sci U S A. 1923 April; 9(4): 135–140.
PMCID: PMC1085298
Journal Matter
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