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Table of Contents

June 15, 1930; vol. 16 no. 6

Genetics

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    THE ORIGIN OF THE PLANTS OF MATERNAL TYPE WHICH OCCUR IN CONNECTION WITH INTERSPECIFIC HYBRIDIZATIONS
    E. M. East
    PNAS June 15, 1930 16 (6) 377-380; https://doi.org/10.1073/pnas.16.6.377

ZoÖlogy

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    MELANOPHORE PULSATIONS IN THE ISOLATED SCALES OF FUNDULUS HETEROCLITUS
    Dietrich C. Smith
    PNAS June 15, 1930 16 (6) 381-385; https://doi.org/10.1073/pnas.16.6.381
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    DIURNAL RHYTHM OF THE DISTAL PIGMENT CELLS IN THE EYES OF CERTAIN CRUSTACEANS
    John H. Welsh
    PNAS June 15, 1930 16 (6) 386-395; https://doi.org/10.1073/pnas.16.6.386
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    THE COLOR CHANGES OF THE TREE TOAD IN RELATION TO NERVOUS AND HUMORAL CONTROL
    G. H. Parker
    PNAS June 15, 1930 16 (6) 395-396; https://doi.org/10.1073/pnas.16.6.395

Mathematics

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    GROUP OF ISOMORPHISMS OF AN ABELIAN GROUP
    G. A. Miller
    PNAS June 15, 1930 16 (6) 398-401; https://doi.org/10.1073/pnas.16.6.398
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    COALESCENCE OF PARTS OF A COMPLEX
    Arthur B. Brown
    PNAS June 15, 1930 16 (6) 401-406; https://doi.org/10.1073/pnas.16.6.401
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    AN EXTENSION OF THE ALEXANDER DUALITY THEOREM
    Arthur B. Brown
    PNAS June 15, 1930 16 (6) 407-408; https://doi.org/10.1073/pnas.16.6.407

Physics

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    MORE COMPLETE DISCUSSION OF THE TIME-DEPENDENCE OF THE NON-STATIC LINE ELEMENT FOR THE UNIVERSE
    Richard C. Tolman
    PNAS June 15, 1930 16 (6) 409-420; https://doi.org/10.1073/pnas.16.6.409
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    THE SIGNIFICANCE OF RECENT COSMIC-RAY EXPERIMENTS
    R. A. Millikan and I. S. Bowen
    PNAS June 15, 1930 16 (6) 421-425; https://doi.org/10.1073/pnas.16.6.421
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    MOTION ON A LATTICE
    C. Hewitt Dix
    PNAS June 15, 1930 16 (6) 426-430; https://doi.org/10.1073/pnas.16.6.426
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    THE ABSORPTION COEFFICIENT OF HARD γ-RAYS
    C. Y. Chao
    PNAS June 15, 1930 16 (6) 431-433; https://doi.org/10.1073/pnas.16.6.431

Psychology

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    ON THE CONDITIONS OF ELICITATION OF CERTAIN EATING REFLEXES
    B. F. Skinner
    PNAS June 15, 1930 16 (6) 433-438; https://doi.org/10.1073/pnas.16.6.433
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    THE ENERGY REQUIREMENTS OF INTENSE MENTAL EFFORT
    Francis G. Benedict and Cornelia Golay Benedict
    PNAS June 15, 1930 16 (6) 438-443; https://doi.org/10.1073/pnas.16.6.438

Engineering

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    BENDING OF CURVED TUBES
    William Hovgaard
    PNAS June 15, 1930 16 (6) 444-451; https://doi.org/10.1073/pnas.16.6.444

Correction

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    EQUILIBRIUM CONSTANTS OF REACTIONS INVOLVING HYDROXYL: A CORRECTION
    PNAS June 15, 1930 16 (6) 396-397; https://doi.org/10.1073/pnas.16.6.396
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