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Table of Contents

May 01, 1939; vol. 25 no. 5

Genetics

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The Time Factor in X-Ray Production of Chromosome Aberrations
Karl Sax

PNAS May 1, 1939 25 (5) 225-233; https://doi.org/10.1073/pnas.25.5.225
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Induction of Triploidy and Haploidy in the Newt, Triturus Viridescens, by Cold Treatment of Unsegmented Eggs
Gerhard Fankhauser and Raymond B. Griffiths

PNAS May 1, 1939 25 (5) 233-238; https://doi.org/10.1073/pnas.25.5.233
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The Rôle of Developmental Rates in the Production of Notched Wing Characters in Drosophila Melanogaster
Werner Braun

PNAS May 1, 1939 25 (5) 238-242; https://doi.org/10.1073/pnas.25.5.238

Astronomy

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Influences of Limiting Magnitude upon Meteor Frequency
Fletcher Watson

PNAS May 1, 1939 25 (5) 243-245; https://doi.org/10.1073/pnas.25.5.243

Physiology and Biochemistry

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Is Auxin Produced in Roots?
J. van Overbeek

PNAS May 1, 1939 25 (5) 245-248; https://doi.org/10.1073/pnas.25.5.245

Botany

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Cell Polarity and the Differentiation of Root Hairs
Edmund W. Sinnott and Robert Bloch

PNAS May 1, 1939 25 (5) 248-252; https://doi.org/10.1073/pnas.25.5.248

Mathematics

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On Modular and p-Adic Representations of Algebras
Richard Brauer

PNAS May 1, 1939 25 (5) 252-258; https://doi.org/10.1073/pnas.25.5.252
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Number of the Subgroups of Any Abelian Group
G. A. Miller

PNAS May 1, 1939 25 (5) 258-262; https://doi.org/10.1073/pnas.25.5.258
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The Transformation of a Lagrangian Series into a Newtonian Series
H. Bateman

PNAS May 1, 1939 25 (5) 262-265; https://doi.org/10.1073/pnas.25.5.262

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