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Volume 46, Annual Issue (1939)

Front Matter

General Interest Articles

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In Memoriam: John Budd Wentz; Arthur Alfred Bryan
H. D. Hughs, A. A. Bryan, and Frederick D. Richey

Research

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Plants New to Iowa
George J. Goodman

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Teaching Aids in Botany. I - The Placement Test
S. M. Dietz and C. J. Gould Jr.

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Notes on the Forests of Southern Iowa
J. A. Larsen and J. R. Dilworth

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Rosa Multiflora and Its Progeny
Clark D. Paris and T. J. Maney

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The Formation of Gas Bubbles in Liquids
W. G. Eversole and G. H. Wagner

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Ethyl Etherates of Zinc Bromide
H. H. Rowley and Florence V. Olson

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The Role of Organoaluminum Compounds in the Friedel-Crafts Reaction
Albert H. Haubein, Lester D. Apperson, and Henry Gilman

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Some Features of the Squaw Formation near Lander, Wyoming
Benjamin H. Burma and Irvin J. Anderson

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Some Quartzite Pebbles
Charles Carter

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Permian Ammonoid Zones
A. K. Miller and W. M. Furnish

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High Voltage Apparatus for Nuclear Physics
A. Ellett, R. D. Huntoon, D. S. Bayley, J. A. Van Allen, and V. J. Young

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Angular Distribution of the Protons from the Deuteron - Deuteron Reaction
A. Ellett, R. D. Huntoon, D. S. Bayley, and J. A. Van Allen

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Studies of Dielectric Liquid Mixtures
Cleo C. Byers and Arthur F. Vetter

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Frequency of Serious Visual Defects
Edith Burma and A. R. Lauer

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The Reliability of an Abbreviated Test of Alertness
Charles R. Rostron and A. R. Lauer

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Tree Study Keys
Ida E. Iversen-Wolden

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The Temperature Cycle in the Okoboji Lakes
Theodore L. Jahn and A. B. Taylor

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The Protozoa of Silver Lake Bog
Don L. Hempstead and Theodore L. Jahn

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Blood Studies in Chronic CO Asphyxia
Marian Davis and Erma Smith

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A Bovine Monstra Duplica
Karl A. Stiles and Collis M. Spencer

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Absorption of Light in the Okoboji Lakes
A. B. Taylor and Theodore Louis Jahn

Back Matter