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Volume 37, Annual Issue (1930)

Front Matter

General Interest Articles

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In Memoriam: George Luther Smith; Henry Albert; D. S. Fairchild; George Bennett p. 37-48
James H. Lees, L. H. Pammel, and Florence Sinclair Chapin

Research

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Notes on the Bacterial Flora of the Snake p. 57-58
Roger Patrick and C. H. Werkman

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Soil Bacteriology as a Science p. 59-64
P. E. Brown

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Further Studies on the Nitrate Assimilating Power of Soils p. 65-69
Ray A. Pendleton and Frederick B. Smith

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Study of the Weeds of Alfalfa Fields of Iowa p. 77-85
A. L. Hershey and L. H. Pammel

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Iowa Plants Notes, IV p. 87-90
R. I. Cratty

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Notes on Iowa Grasses p. 91-94
Robert P. Adams

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Notes on Some Iowa Cladonias p. 95-100
Alfred R. Stanley

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Notes On Iowa Mosses II p. 98-100
Lucy M. Cavanagh

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Polyembryony in Alfalfa and Sweet Clover p. 100-100
John R. Watt and J. N. Martin

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Noteworthy Iowa Fungi p. 111-114
Guy West Wilson

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Development of the Vascular System of Corn p. 125-126
A. L. Hershey and J. N. Martin

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Germination and Seedling Forms of Some Woody Plants p. 131-141
L. H. Pammel and C. M. King

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Single Spore Isolation p. 151-159
W. H. Davis

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Heliantheae of Iowa II p. 161-208
M. Rae Johns

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European Bindweed in Iowa p. 210-210
A. L. Bakke

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Purification of Water by Electro-Osmose p. 211-216
Edward Bartow and R. H. Jebens

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Base Exchange Between Dyes and Soils p. 217-222
Wilbur L. Hoff and J. A. Wilkinson

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The Adsorption of Certain Vapors by Activated Charcoal p. 223-223
J. N. Pearce and Paul E. Peters

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The Solubility of Copper Iodate in Aqueous Salt Solutions p. 223-224
Ben H. Peterson and Earl L. Meyers

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The Adsorption of Chromate Ions by Colloidal Aluminum Hydroxide p. 224-224
Ben H. Peterson and Kieth H. Storks

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Catalytic Hydrogenation of Furfural p. 225-225
Ralph L. Van Peursem

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Some Physical Properties of Concentrated Aqueous Salt Solutions p. 225-225
J. N. Pearce and Mildred A. Hooper

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The Baking Temperature of Bread p. 231-233
O. B. Read

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Decomposition of Optically Active Diazo Compounds p. 235-236
Francis Earl Ray and Martha G. Hemphill

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The Chlorine Derivatives of Vanillin p. 247-247
L. Chas. Raiford and J. G. Lichty

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Mechanisms of Addition and Substitution Reactions of Furfural and Derivatives p. 247-248
Henry Gilman, G. F. Wright, J. B. Dickey, and A. P. Hewlett

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The Toxicities of Some Organo-Lead Compounds for Cancer and Related Studies p. 248-248
Henry Gilman, O. M. Gruhzit, J. D. Robinson, and E. B. Towne

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The Preparation of m-Hydroxybenzonitrile p. 248-249
James B. Culbertson, Erwin L. Carpenter, and Ernest K. Nielsen

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Monobromoamine with Organomagnesium Halides p. 250-250
Geroge H. Coleman and Charles B. Yager

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Selective Action in the Zincke Nitration p. 250-250
L. Chas. Raiford and G. R. Miller

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A Spirifer disjunctus Fauna in Iowa p. 251-254
Lowell Robert Laudon

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Naming of Burlington Limestone p. 273-274
Charles Keyes

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The Clarinda Oil Prospect p. 274-274
James H. Lees

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Ice Caves p. 275-275
John E. Smith

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A Statistical Test of Experimental Technique p. 279-287
George W. Snedecor

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On the Summation Σx^n p. 289-290
John F. Reilly

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Statistical Control of a Grading System p. 290-293
George W. Snedecor

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Some Recent Developments in High Pressure Windows p. 299-302
Robert Wilson and Thos. C. Poulter

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Skyshine and Sunshine at Ames p. 303-305
William Kunerth and Russel D. Miller

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Absorption Spectrum of Vitamin A Concentrates p. 310-310
Jay W. Woodrow and J. B. Philipson

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Magnetization of Electrolytic Nickel Films p. 313
E. P. T. Tyndall and H. E. Malmstrom

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Velocity of Ultra-Sonic Waves in Vapor p. 314-315
George E. Thompson

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Mean Free Path of Gases by a Direct Method p. 315-315
John A. Eldridge

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On the Conductivity of Cod Liver Oil p. 316-317
L. W. Butler

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Judging Children's Literature p. 352-354
Ivy C. Husband

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The Psychology of Division p. 354-355
H. A. Jeep

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Some Needed Bird Observations in Iowa p. 367-369
Walter W. Bennett

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Twelve Hundred Miles of Winter Birds p. 371-374
Chas. J. Spiker

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Springtails as Economic Insects p. 389-392
Harlow B. Mills

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The Buffalo in Iowa p. 397-397
L. H. Pammel

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Notes on Vertebrates of Iowa Prairies p. 398-399
Geroge O. Hendrickson

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Biology in High Schools of Iowa p. 399-400
George O. Hendrickson

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Comparative Growths of Infusoria-Free and Normal Lambs p. 400-400
E. R. Becker and R. E. Everett

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Some Home-Made Teaching Models p. 400-401
J. E. Guthrie

Back Matter

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Index p. 403-410