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Volume 8(4);  April 1922
The cover of the journal
Astronomy
Note on the Problem of Great Stellar Distances
Harlow Shapley
Proc Natl Acad Sci U S A. 1922 April; 8(4): 69–71.
PMCID: PMC1084996
Chemistry
The Oxidation of Hydroquinol in the Presence of Aliphatic Amines
Rolla N. Harger
Proc Natl Acad Sci U S A. 1922 April; 8(4): 57–59.
PMCID: PMC1084991
Mathematics
A Solution of the Linear Matrix Equation by Double Multiplication
Frank Lauren Hitchcock
Proc Natl Acad Sci U S A. 1922 April; 8(4): 78–83.
PMCID: PMC1084999
Physics
The Grating Space of Mica and the Intensities of the Spectral Orders
Bergen Davis and H. M. Terrill
Proc Natl Acad Sci U S A. 1922 April; 8(4): 59–60.
PMCID: PMC1084992
Ionization and Radiation Potentials and the Size of the Atom
Bergen Davis
Proc Natl Acad Sci U S A. 1922 April; 8(4): 61–63.
PMCID: PMC1084993
Periods and Logarithmic Decrement of the Gravitation Needle under High Exhaustion
C. Barus
Proc Natl Acad Sci U S A. 1922 April; 8(4): 63–66.
PMCID: PMC1084994
Plane Reflection of Sound, as Exhibited by the Pinhole Resonator
C. Barus
Proc Natl Acad Sci U S A. 1922 April; 8(4): 66–69.
PMCID: PMC1084995
Statistics
The Vital Index of the Population of England and Wales, 1838-1920
Raymond Pearl and Magdalen H. Burger
Proc Natl Acad Sci U S A. 1922 April; 8(4): 71–76.
PMCID: PMC1084997
Seasonal Fluctuations of the Vital Index of a Population
Raymond Pearl
Proc Natl Acad Sci U S A. 1922 April; 8(4): 76–78.
PMCID: PMC1084998
Journal Matter
Original table of contents page
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