Table of Contents

Physics

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  The Quantum Theory of the Fraunhofer Diffraction

  P. S. Epstein and P. Ehrenfest

  PNAS April 1, 1924 10 (4) 133-139; https://doi.org/10.1073/pnas.10.4.133
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  Effective Radii of Gas Molecules

  L. L. Nettleton

  PNAS April 1, 1924 10 (4) 140-145; https://doi.org/10.1073/pnas.10.4.140
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  Note on Absorption Measurements of the X-Rays Reflected from a Calcite Crystal

  Y. H. Woo

  PNAS April 1, 1924 10 (4) 145-148; https://doi.org/10.1073/pnas.10.4.145
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  The Secondary and Tertiary Rays from Chemical Elements of Small Atomic Number Due to Primary X-Rays from a Molybdenum Target

  George L. Clark, Wm. Duane, and W. W. Stifler

  PNAS April 1, 1924 10 (4) 148-152; https://doi.org/10.1073/pnas.10.4.148
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  Density and Diffusion of Gases Measured by Displacement Interferometry

  Carl Barus

  PNAS April 1, 1924 10 (4) 153-155; https://doi.org/10.1073/pnas.10.4.153
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  The Behavior of Low Velocity Electrons in Methane Gas

  George Glockler

  PNAS April 1, 1924 10 (4) 155-160; https://doi.org/10.1073/pnas.10.4.155