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Volume 4(7);  July 1918
The cover of the journal
Geology
Fringing Reefs of the Philippine Islands
W. M. Davis
Proc Natl Acad Sci U S A. 1918 July; 4(7): 197–204.
PMCID: PMC1091442
Mathematics
On the Representation of a Number as the Sum of any Number of Squares, and in Particular of five or seven
G. H. Hardy
Proc Natl Acad Sci U S A. 1918 July; 4(7): 189–193.
PMCID: PMC1091440
Pathology
Dilation of the Great Arteries Distal to Partially Occluding Bands
William S. Halsted
Proc Natl Acad Sci U S A. 1918 July; 4(7): 204–210.
PMCID: PMC1091443
Physics
The Crystal Structure of Ice
Ancel St. John
Proc Natl Acad Sci U S A. 1918 July; 4(7): 193–197.
PMCID: PMC1091441
On the Correction of Optical Surfaces
A. A. Michelson
Proc Natl Acad Sci U S A. 1918 July; 4(7): 210–212.
PMCID: PMC1091444
Journal Matter
Original table of contents page
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