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Volume 3(4);  April 1917
The cover of the journal
Agriculture
The Importance of the Water Contained in the Deeper Portions of the Subsoil
F. J. Alway and G. R. McDole
Proc Natl Acad Sci U S A. 1917 April; 3(4): 257–260.
PMCID: PMC1091228
Anthropology
Zuñi Chronology
Leslie Spier
Proc Natl Acad Sci U S A. 1917 April; 3(4): 280–283.
PMCID: PMC1091234
Astronomy
Studies of Magnitudes in Star Clusters: V. Further Evidence of the Absence of Scattering of Light in Space
Harlow Shapley
Proc Natl Acad Sci U S A. 1917 April; 3(4): 267–270.
PMCID: PMC1091231
Studies of Magnitudes in Star Clusters: VI. The Relation of Blue Stars and Variables to Galactic Planes
Harlow Shapley
Proc Natl Acad Sci U S A. 1917 April; 3(4): 276–279.
PMCID: PMC1091233
Chemistry
A New Method of Transforming Esters of α-Aminoacids into their Corresponding Isothiocyanate
Treat B. Johnson and Arthur A. Ticknor
Proc Natl Acad Sci U S A. 1917 April; 3(4): 303–305.
PMCID: PMC1091239
Genetics
Body Pigmentation and Egg Production in the Fowl
J. Arthur Harris, A. F. Blakeslee, and D. E. Warner
Proc Natl Acad Sci U S A. 1917 April; 3(4): 237–241.
PMCID: PMC1091224
The Bearing of Selection Experiments with Drosophila upon the Frequency of Germinal Changes
Edwin Carleton MacDowell
Proc Natl Acad Sci U S A. 1917 April; 3(4): 291–297.
PMCID: PMC1091237
Dominance of Linked Factors as a Means of Accounting for Heterosis
Donald F. Jones
Proc Natl Acad Sci U S A. 1917 April; 3(4): 310–312.
PMCID: PMC1091241
Geology
The Age of the Bolivian Andes
Edward W. Berry
Proc Natl Acad Sci U S A. 1917 April; 3(4): 283–285.
PMCID: PMC1091235
Large Current-Ripples as Indicators of Paleogeography
Walter H. Bucher
Proc Natl Acad Sci U S A. 1917 April; 3(4): 285–291.
PMCID: PMC1091236
Pressure Phenomena Accompanying the Growth of Crystal
Stephen Taber
Proc Natl Acad Sci U S A. 1917 April; 3(4): 297–302.
PMCID: PMC1091238
The Geology of the Fiji Islands
Wilbur G. Foye
Proc Natl Acad Sci U S A. 1917 April; 3(4): 305–310.
PMCID: PMC1091240
Mathematics
Dynamical Systems with Two Degrees of Freedom
George D. Birkhoff
Proc Natl Acad Sci U S A. 1917 April; 3(4): 314–316.
PMCID: PMC1091243
National Research Council
Membership of the Committees of the Council
Proc Natl Acad Sci U S A. 1917 April; 3(4): 317–318.
PMCID: PMC1091244
Pathology
The Transformation of Pseudoglobulin into Euglobulin
William N. Berg
Proc Natl Acad Sci U S A. 1917 April; 3(4): 261–264.
PMCID: PMC1091229
Chemically Induced Crowngalls
Erwin F. Smith
Proc Natl Acad Sci U S A. 1917 April; 3(4): 312–314.
PMCID: PMC1091242
Physics
A Re-determination of the Value of the Electron and of Related Constants
R. A. Millikan
Proc Natl Acad Sci U S A. 1917 April; 3(4): 231–236.
PMCID: PMC1091223
The Shapes of Group Molecules Forming the Surfaces of Liquids
Irving Langmuir
Proc Natl Acad Sci U S A. 1917 April; 3(4): 251–257.
PMCID: PMC1091227
Zoology
Variability of Germ Cells of Sea Urchins
A. J. Goldfarb
Proc Natl Acad Sci U S A. 1917 April; 3(4): 241–245.
PMCID: PMC1091225
Transplantation of Limbs
Ross G. Harrison
Proc Natl Acad Sci U S A. 1917 April; 3(4): 245–251.
PMCID: PMC1091226
A Case of Normal Embryonic Atresia of the Esophagus
H. E. Jordan
Proc Natl Acad Sci U S A. 1917 April; 3(4): 264–267.
PMCID: PMC1091230
The History of the Primordial Germ Cells in the Loggerhead Turtle Embryo
H. E. Jordan
Proc Natl Acad Sci U S A. 1917 April; 3(4): 271–275.
PMCID: PMC1091232
Journal Matter
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