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Volume 36, Annual Issue (1929)

Front Matter

General Interest Articles

Research

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The Effect of Lime on Nitrification in the Grundy Silt Loam p. 45-51
R. H. Walker and L. G. Thompson Jr.

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Studies on Methods of Measuring the Nitrate Assimilating Power of Soils p. 75-78
Ray A. Pendleton and Frederick B. Smith

 

Bacterial Activity in Soils Variously Treated p. 87-91
P. E. Brown and D. I. Aquino

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Variations in Soil Reaction Affect Nitrification p. 93-97
P. E. Brown and G. V. C. Houghland

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The Effects of Some Nitrogen Fertilizers on Nitrification p. 99-103
Ray A. Pendleton, P. E. Brown, and F. B. Smith

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The Effect of Steffen Waste on the Fermentation of Pentosans from the Corn Stalk p. 111-111
E. I. Fulmer, C. H. Werkman, R. M. Hixon, and A. L. Williams

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Physiological Behavior of the Propionic Acid Group of Bacteria p. 111-111
Sara E. Kendall and C. H. Werkman

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The Production of Propionic Acid from Pentoses by Propionibacterium pentosaceum p. 111-112
C. H. Werkman, R. M. Hixon, E. I. Fulmer, and C. H. Rayburn

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Lightning Injury to Alfalfa p. 125-126
Joseph C. Gilman

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Notes on Fungi — 1928 p. 127-130
G. W. Martin

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Notes on Iowa Mosses. I p. 133-135
Lucy M. Cavanagh

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Additional Notes on Iowa Mosses p. 137-139
Betty Blagg

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Heliantheae of Iowa. I p. 147-184
M. Rae Johns

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Stimulation of Root Growth on Cuttings from Hardwood Forest Trees p. 191-200
G. C. Hutchings and J. A. Larsen

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Germination of Trees and Shrubs p. 201-211
L. H. Pammel and C. M. King

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Weed Succession on an Abandoned Roadway p. 213-219
Robert P. Adams

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Heights of Weeds p. 221-231
L. H. Pammel and C. M. King

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The Determination of Manganese in Potable Waters p. 245-250
Edward Bartow and Harris Thompson

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The Precise Determination of Sulfates p. 261-261
Stephen Popoff and E. W. Neuman

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A Theory of Solubility p. 262-263
P. A. Bond

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A Summary of Oxidation-Reduction Potentials p. 263-264
Stephen Popoff, A. H. Kunz, J. A. Riddick, and W. W. Becker

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The Influence of pH Values on the Oxidation of Ferrous Sulphate p. 264-265
Jacob Cornog and Albert Hershberger

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The Determination of Oxidation-Reduction Potentials from Equilibrium Data p. 265-265
Stephen Popoff, V. B. Fleharty, and E. L. Hanson

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Further studies on the Utilization of Agricultural Wastes p. 265-266
Henry Gilman, R. E. Brown, J. B. Dickey, A. P. Hewlett, and G. F. Wright

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The Synthesis of 4-Hydroxy and 2-Hydroxy-Diphenyl Ketimines p. 266-267
Paul Vittum, Richard Anderson, and J. B. Culbertson

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The Effect of Manganese on the Growth of Rats p. 267-267
V. E. Nelson, J. M. Evvard, and W. E. Sewell

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Derivatives of 3-Amino-4-Methoxytoluene p. 268-268
L. Chas. Raiford and Oliver Grosz

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The Effects of Substituents in the Formation of Thiocarbanilides p. 269-269
L. Chas. Raiford and G. Mervin McNulty

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The Lability and Relative Reactivities of Organic Radicals p. 269-270
Henry Gilmann, Edith L. St. John, and L. L. Heck

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Some Physico-Chemical Studies of Organo-Metallic Compounds p. 270-270
Henry Gilman, L. L. Heck, and J. A. Leermakers

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What Shall We Do with Precambrian? p. 277-278
Charles Keyes

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Oil Structures in Iowa p. 279-279
Charles Keyes

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Foraminifera in the Iowa Devonian p. 279-280
A. O. Thomas

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Glacial Outlook from Iowa p. 280-280
Charles Keyes

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The Fluorescence of Cod Liver Oil p. 297-297
C. A. Morehouse

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Magnetic Properties of Thin Cobalt Films Electrolytically Deposited p. 297-297
E. P. T. Tyndall and W. W. Wertzbaugher

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Physical Properties of Some Vegetables p. 297-298
Earl C. McCracken

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The Conductivity of Cod Liver Oil p. 299-300
L. W. Butler

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Ballistic Amplifier p. 302-302
J. M. B. Kellogg

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X-Ray Diffraction by Organic Solutions p. 393-394
Alfred W. Meyer

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The Effect of Pressures up to 16000 Atmospheres Upon the E.M.F. of the Weston Standard Cell p. 394-394
Thomas C. Poulter, Carter Richey, Robert Wilson, and John Fulton

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A Molecular Velocity Filter p. 307-307
John A. Eldridge

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Development of Imagination p. 313-320
Elizabeth G. Andrews

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The Evaluation of the Musical Capacity of Nursery School Children p. 321-328
Thomas F. Vance and Medora Grandprey

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Some Factors Involved in Motivation p. 335-341
Nira M. Klise

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A Study of Antagonistic Habits p. 343-343
Martin F. Fritz

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The Uses and Abuses of the Questionary Method p. 343-343
Christian A. Ruckmick

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Speech Sounds of Preschool Children p. 344-345
Beth L. Wellman

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An Experiment in Mental Rehabilitation p. 345-346
Walter S. Newell

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A Synthetic Tone-Mixer p. 346-347
Joseph Tiffin

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Snake Notes p. 349-359
J. E. Guthrie

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Some Notes on Collecting Cerambycidae p. 367-369
Robert E. Ware

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Abnormalities Found in a Two Headed Calf p. 377-379
Horace Essex and Marshall Huston

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Cliff Swallow Colonies in Iowa p. 381-381
W. F. Kubichek

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The European Starling in Iowa p. 381-382
W. F. Kubichek

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On the Inheritance of Resistance to Fowl Typhoid in Chickens p. 382-383
W. V. Lambert and C. W. Knox

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The Sex Ratio in Guinea Pigs p. 383-383
R. G. Schott

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The Inheritance of Leg-Feathering in the Chicken p. 383-384
W. V. Lambert and C. W. Knox

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The Myriopoda of Iowa p. 384-384
Betty Rogers

Back Matter

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Index p. 385-393