Abstracts of Doctoral Theses pages 1-160

The Effect of Sodium Thiosulfate and Sodium Hydrogen Sulfite on Some Silks. Ruth L. Johnson, Minnie E. Lichte, and Rachel Edgar pages 411-420

The X2 Correction for Continuity. W.G. Cochran pages 421-436

Parasites of the American Coot (Fulica americana) in Central Iowa. Robert L. Roudabush pages 437-442

Nature of Eimeria nieschulzi-growth-promoting Potency of Feeding Stuffs. III. Pantothenic Acid. E.R. Becker and Lawrence Smith pages 443-450

Gluconic Acid Production by Acetobacter in the Absence of a Neutralizing Agent. N. Porges, T.F. Clark, and E.A. Gastrock pages 451-470

Description of Mimeae trib. nov. With Three Genera and Three Species and Two New Species of Neisseria from Conjunctivitis and Vaginitis. George G. De Bord pages 471-480

Anent the Origin of Sweet Corn. A.T. Erwin pages 481-486

Mosquito Light Trap Catches From Ten Iowa Cities, 1940. J.A. Rowe pages 487-518

Evaluation of Germicidal Properties of Sodium Hydroxide and Alkaline Washing Compounds. C.R. Arnold and Max Levine pages 519-538

Ticks Collected on the Tama (Iowa) Indian Reservation with Notes on Other Species. Gaines W. Eddy and Charles R. Joyce pages 539-543

Seasonal Food Preference Trends of Eastern Ruffed Grouse in Iowa as Shown By Dropping Analysis. Emmett B. Polderboer pages 331-336

The Dissinilation of Glucose by Chaetomium funicola Cke. G. Semeniuk pages 337-348

Circulation of Hemolymph in the Wings of the Cockroach, Blatella germanica L. Stewart Clare and Oscar E. Tauber pages 349-356

The Chilean Rhopalidae in the Edwyn C. Reed Collection (Hemiptera). H.M. Harris pages 357-362

Fluorescent Bacteria in Dairy Products. E.R. Garrison and B.W. Hammer pages 363-378

A Microscopic Method of Studying Soil Structure. C.Loyal and W. Swanson pages 379-390

A Comparison of the Aluminum-Chloride and the Sulfuric-Acid Methods for Quantitative Estimation of Wool. Lois W. Dale and Rachel Edgar pages 391-398

New Ants from Minnesota, Iowa, and Wisconsin. William F. Buren pages 399-408

Eimeria neoleporis n.sp., Occurring Naturally in the Cottontail and Transmissible to the Tame Rabbit. Jose Candido M. Carvalho pages 409-410

The Number of Stereoisomeric Alcohols. Edward S. Allen and Harvery Diehl pages 161-172

Properties of a Generalized Operator. Fred Robertson pages 173-188

Histogenesis in the Roots of Holcus sorghum L. Hsiu-Hui Chi pages 189-206

The Determination of the Total Fixed Nitrogen Content of Power Plant Flue Gasses. O.R. Sweeney, F.E. Cambell, and Burdette Jones pages 207-210

Preliminary Report on Iowa Mosquitoes. John A. Rowe pages 211-226

Activated Carbon from Certain Agricultural Wastes. T.R. McElhinney, B.M. Becker, and P. Burke Jacobs pages 227-240

A List of Chinese Miridae (Hemiptera) with Keys to Subfamilies, Tribes, Genera, and Species. Tsai Yu Hsiao pages 241-270

The Use of Fungi in Modern Genetical Analysis. Carl C. Lindegren pages 271-290

Levulose From Chicory, Dahlias, and Artichokes. E.S. Haber, W.G. Gaessler, and R.M. Hixon pages 291-298

Some Major Factors Affecting the Use of Two Inventory Methods Applicable to the Western Fox Squorrel, Sciurus Niger rufiventer (Geoffroy). Ellis A. Hicks pages 299-306

Nuclear Apparatus and Sexual mechanism in a Micrococcus. Carl C. Lindegren pages 307-318

Consolidation of Elastic Earth Layers. D.L. Holl pages 319-328

Two New Peruvian Tingitida (Hemiptera). Carl J. Drake and EJ. Hambleton pages 329-330