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Table of Contents

June 15, 1929; vol. 15 no. 6

Chemistry

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THE RATE OF DECOMPOSITION OF NITROGEN PENTOXIDE AT MODERATELY LOW PRESSURE
H. C. Ramsperger, M. E. Nordberg, and R. C. Tolman

PNAS June 15, 1929 15 (6) 453-459; https://doi.org/10.1073/pnas.15.6.453
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TYPES OF UNIMOLECULAR REACTIONS
Oscar Knefler Rice

PNAS June 15, 1929 15 (6) 459-462; https://doi.org/10.1073/pnas.15.6.459
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THE VALENCE OF SULFUR IN DITHIONATES
Ralph E. Winger and Don M. Yost

PNAS June 15, 1929 15 (6) 462-464; https://doi.org/10.1073/pnas.15.6.462

Botany

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STUDIES ON THE GROWTH OF ROOT HAIRS IN SOLUTIONS. THE PH MOLAR RATE RELATION FOR BRASSICA OLERACEA IN CALCIUM SULPHATE
Wanda K. Farr

PNAS June 15, 1929 15 (6) 464-470; https://doi.org/10.1073/pnas.15.6.464

Astronomy

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SOME NEW FEATURES OF THE ATMOSPHERIC OXYGEN BANDS, AND THE RELATIVE ABUNDANCE OF THE ISOTOPES O¹⁶, O¹⁸
Harold D. Babcock

PNAS June 15, 1929 15 (6) 471-477; https://doi.org/10.1073/pnas.15.6.471

Geology and Paleontology

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FOSSIL PLANTS AND MOUNTAIN UPLIFT IN THE PACIFIC STATES
Edward W. Berry

PNAS June 15, 1929 15 (6) 477-480; https://doi.org/10.1073/pnas.15.6.477

ZoÃlogy

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THE ANALYSIS OF A CONCRETE CASE OF INTERGRADATION BETWEEN TWO SUBSPECIES. II. ADDITIONAL DATA AND INTERPRETATIONS
Francis B. Sumner

PNAS June 15, 1929 15 (6) 481-493; https://doi.org/10.1073/pnas.15.6.481

Mathematics

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ON THE LINEAR CONNECTION INDEX OF THE ALGEBRAIC SURFACES zⁿ = (fx, y)
Oscar Zariski

PNAS June 15, 1929 15 (6) 494-501; https://doi.org/10.1073/pnas.15.6.494

Genetics

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THE OCCURRENCE OF A NICOTIANA GLUTINOSA HAPLONT
Thomas Harper Goodspeed and Priscilla Avery

PNAS June 15, 1929 15 (6) 502-504; https://doi.org/10.1073/pnas.15.6.502

Physics

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FURTHER REMARKS CONCERNING THERMIONIC “A” AND “b,” A REVISION AND EXTENSION
Edwin H. Hall

PNAS June 15, 1929 15 (6) 504-514; https://doi.org/10.1073/pnas.15.6.504
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ON THE RAMAN EFFECT IN DIATOMIC GASES. II
F. Rasetti

PNAS June 15, 1929 15 (6) 515-519; https://doi.org/10.1073/pnas.15.6.515
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ON THE THEORY OF ELECTRON SCATTERING IN GASES
Allan C. G. Mitchell

PNAS June 15, 1929 15 (6) 520-525; https://doi.org/10.1073/pnas.15.6.520
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MOLECULAR BINDING AND LOW ⁵S TERMS OF N⁺ AND C
Louis A. Turner

PNAS June 15, 1929 15 (6) 526-528; https://doi.org/10.1073/pnas.15.6.526
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WAVE-LENGTH OF THE K LINES OF COPPER USING RULED GRATINGS
J. A. Bearden

PNAS June 15, 1929 15 (6) 528-533; https://doi.org/10.1073/pnas.15.6.528
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EFFECT OF VOLUME CHANGES ON THE INFRA-RED VIBRATIONS OF SIMPLE CRYSTALS
E. O. Salant

PNAS June 15, 1929 15 (6) 533-537; https://doi.org/10.1073/pnas.15.6.533

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