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Table of Contents

September 01, 1943; vol. 29 no. 9

Mathematics

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Dynamical Trajectories in a Resisting Medium
Edward Kasner

PNAS September 1, 1943 29 (9) 263-268; https://doi.org/10.1073/pnas.29.9.263
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Dynamical Trajectories of the Curvature Type
John De Cicco

PNAS September 1, 1943 29 (9) 268-270; https://doi.org/10.1073/pnas.29.9.268
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Union-Preserving Transformations of Differential-Elements
Edward Kasner and John De Cicco

PNAS September 1, 1943 29 (9) 271-275; https://doi.org/10.1073/pnas.29.9.271
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A Formula for the Stream Function of Certain Flows
Stefan Bergman

PNAS September 1, 1943 29 (9) 276-281; https://doi.org/10.1073/pnas.29.9.276

Bacteriology

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Strain Specificity and Production of Antibiotic Substances
Selman A. Waksman and Elizabeth Bugie

PNAS September 1, 1943 29 (9) 282-288; https://doi.org/10.1073/pnas.29.9.282

Biochemistry

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Competition between Free and Combined Nitrogen in Nutrition of Azotobacter
P. W. Wilson, J. F. Hull, and R. H. Burris

PNAS September 1, 1943 29 (9) 289-294; https://doi.org/10.1073/pnas.29.9.289

Correction

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Correction to “On Certain Non-Linear Differential Equations of the Second Order”
PNAS September 1, 1943 29 (9) 281;

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