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This journal provides immediate access to some articles. Volume 18(3); March 1932 Astronomy On the Relation between the Expansion and the Mean Density of the Universe PMCID: PMC1076193 Chemistry Azo Derivatives of the Pyrimidines PMCID: PMC1076194 Genetics Some Effects of High Temperature on Polyploidy and Other Variations in Maize PMCID: PMC1076195 Mathematics On the Field of Values of a Square Matrix PMCID: PMC1076200 Remarks on the Ergodic Theory of Birkhoff PMCID: PMC1076201 A Geometrical Determination of the Canonical Quadric of Wilczynski PMCID: PMC1076202 Dynamical Systems of Continuous Spectra PMCID: PMC1076203 Physical Applications of the Ergodic Hypothesis PMCID: PMC1076204 Complex Geometry and Relativity; Theory of the “Rac” Curvature PMCID: PMC1076205 Regular Families of Curves: I PMCID: PMC1076206 Recent Contributions to the Ergodic Theory PMCID: PMC1076207 On the Numerations of the Continued Fraction PMCID: PMC1076208 Physics Note on the Quantum Dynamical Correction of the Equation of State PMCID: PMC1076196 Effect of Nuclear Spin on the Radiation Excited by Electron Impact PMCID: PMC1076197 Entropy, Reversible Processes and Thermo-Couples PMCID: PMC1076198 Comments on the Note by E. H. Kennard on “Entropy, Reversible Processes and Thermo-Couples” PMCID: PMC1076199 Correction Elimination of Self-Sterility in the Styela Egg—A Re-Interpretation with Further Experiments PMCID: PMC1076209 Corrects: Elimination of Self-Sterility in the Styela Egg—A Re-Interpretation with Further Experiments. Proc Natl Acad Sci U S A. 1932 January; 18(1): 131–135. Journal Matter Administrative content — journal masthead, notices, indexes, etc. | ||
