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Volume 30, Annual Issue (1923)

Front Matter

General Interest Articles

Research

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New Vibrations within a Conical Horn p. 65-66
Victor A. Hoersch

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The "K" and "L" X-Ray Spectra of Tungsten p. 67-70
Charles B. Crofutt

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On Super-Regeneration p. 78-78
E. O. Hulburt

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Standards of Capacity p. 79-79
J. B. Dempster, E. G. Linder, and E. O. Hulburt

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The Genus Empoasca in North America p. 87-133
Albert Hartzell

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A Zoological Park in New Zealand p. 143-145
Dayton Stoner

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An Instance of Polymely in the Frog p. 157-161
Albert Kuntz

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Fish Foods in Relation to Fish Culture p. 163-166
Willis De Ryke

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Vitamin Deficiency Studies : 1. The Relation of Vitamin Deficiency to Muscle Fatigue in Rats p. 171-171
V. E. Nelson, F. M. Baldwin, Anna Gertrude Riggs, and Marjorie Cunningham

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Some Food Reactions of Snails p. 181-184
E. W. Johns

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The Banana Snake Boa imperator p. 189-196
J. E. Guthrie

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The Terrestrial Isopods of Iowa p. 197-199
Mayne Longnecker

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Some Notes on Plants of Whitehall, Michigan p. 279-285
L. H. Pammel and R. I. Cratty

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Germination Studies of Some Trees and Shrubs p. 287-293
L. H. Pammel and C. M. King

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A Day near Muskogee, Oklahoma p. 295-296
L. H. Pammel

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Notes on Introduced Plants p. 333-336
Robert B. Wylie

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Plants and the Surface Film of Water p. 337-343
Robert B. Wylie

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Polygonum in the State of Iowa p. 345-349
G. L. Wittrock

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Cuscuta in Iowa p. 351-354
G. L. Wittrock

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Citation of Authorities for Latin Names p. 355-357
Henry S. Conard

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The Arborescent Flora of Midwest Farmsteads p. 359-364
T. J. Fitzpatrick

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Some Polypores in Henry County p. 365-365
Mary Carnahan

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Methods of Modeling the Agaricaceae p. 369-374
Kathryn Gilmore

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Substances Dissolved in Rain and Snow p. 375-378
H. S. Fries and Nicholas Knight

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Fossil Annelid Jaws from the Iowa Devonian p. 433-436
Walter V. Searight

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Lake Huron Winter Beach Forms p. 451-453
Max Littlefield

Back Matter

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Index p. 485-490