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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

ZoÃlogy

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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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