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Volume 8(5);  May 1922
The cover of the journal
Astronomy
Dark Nebulae
Henry Norris Russell
Proc Natl Acad Sci U S A. 1922 May; 8(5): 115–118.
PMCID: PMC1085009
Petrology
The Average Chemical Composition of Igneous Rocks
Frank W. Clarke and Henry S. Washington
Proc Natl Acad Sci U S A. 1922 May; 8(5): 108–115.
PMCID: PMC1085008
Physics
Note on X-Ray Spectra
William Duane and R. A. Patterson
Proc Natl Acad Sci U S A. 1922 May; 8(5): 85–90.
PMCID: PMC1085003
A New Method of Using X-Rays in Crystal Analysis
George L. Clark and William Duane
Proc Natl Acad Sci U S A. 1922 May; 8(5): 90–96.
PMCID: PMC1085004
Acoustic Topography Varying with the Position of the Organ Pipe
Carl Barus
Proc Natl Acad Sci U S A. 1922 May; 8(5): 96–100.
PMCID: PMC1085005
On Steering an Automobile around a Corner
A. G. Webster
Proc Natl Acad Sci U S A. 1922 May; 8(5): 100–106.
PMCID: PMC1085006
Statistics
The Probable Error of the Vital Index of a Population
John Rice Miner
Proc Natl Acad Sci U S A. 1922 May; 8(5): 106–108.
PMCID: PMC1085007
Journal Matter
Original table of contents page
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