Table of Contents

May 15, 1941; 27 (5)

Astronomy

  • Astronomy:
    • P. Swings
    • and O. Struve

    Two Interesting Nuclei of Planetary Nebulae

    Proc Natl Acad Sci U S A 1941 27:225-229

Chemistry

  • Chemistry:
    • S. F. Carson,
    • J. W. Foster,
    • S. Ruben,
    • and H. A. Barker

    Radioactive Carbon as an Indicator of Carbon Dioxide Utilization

    Proc Natl Acad Sci U S A 1941 27:229-235
  • Chemistry:
    • A. L. LeRosen,
    • F. W. Went,
    • and L. Zechmeister

    Relation between Genes and Carotenoids of the Tomato

    Proc Natl Acad Sci U S A 1941 27:236-242

Mathematics

  • Mathematics:
    • Richard Courant

    On the First Variation of the Dirichlet-Douglas Integral and on the Method of Gradients

    Proc Natl Acad Sci U S A 1941 27:242-248

This Issue

  1. Astronomy
  2. Chemistry
  3. Mathematics

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