Germination Studies of Sweet Clover Seed. John N. Martin pages 289-300

The Parasitism Experiment to Learn the Effects of Four Androgens Injected Into Male Chicks. Geroge W. Snedecor and W. R. Breneman pages 333-342

Effects of Different Food Plants on Egg Production and Adult Survival of the Grasshopper, Melanoplus bivittatus (Say). Oscar E. Tauber, Carl J. Drake, and Geroge C. Decker pages 343-360

Pythium Root Necrosis of Oats. Aaron Welch pages 361-400

Some Factors Determining the Infection of Corn by Ustilago zeae (Beckm.) Unger. Robert E. Wlkinson and G.C. Kent pages 401-414

Distribution of Euphorbiaceae in Iowa, With Seed Keys Margaret R. Murley pages 415-428

Further Toxicity Studies with the Dog Tick, Dermacebtor variabilis (Say). anne H. Tauber, C.R. Joyce, and Oscar E. Tauber pages 429-434

Comparative Studies of Some Peritrichous Phytopathogenic Bacteria. E.L. Waldee pages 435-484

Abstracts of Doctoral Theses. pages 1-66

Development and Structure of Bromus inermis Leyss. Irving William Knobloch pages 67-98

Concerning American Rhopalini (Hemiptera, Rhopalidae). H.M. Harris pages 99-110

Winifred F. Coover, The Man. Anson Hayes pages 231-236

Coover, The Teacher. Charles E. Friley pages 237-240

Professor W.F. Coover and the Division of Science. Harold V. Gaskill pages 241-242

The Organization of a College Chemistry Department. Raymond E. Kirk pages 243-246

Introduction. Julian Harrison Toulouse pages 247-248

Twenty-Five Years of Research on Fermentation Processes in Professor Coover's Department. Leo M. Christensen pages 249-254

New Developments in Insecticides. L.D. Goodhue pages 255-262

Chemistry at Work. Harold L. Maxwell pages 263-268

Forty Years of Progress in Food Chemistry. Lillian B. Storms pages 269-278

Synthetic Rubber. Joseph P. Nelson pages 279-288

A Second Supplement to the Catalogue of Iowa Plants in the Iowa State College Herbarium. Ada Hayden pages 111-132

Flora of Alaska and Adjacent Parts of Canada. J.P. Anderson pages 133-206

Observations on Oviposition and Adult Survival of Some Grasshoppers of Economic Importance. C.J. Drake, G.C. Decker, and Oscar E. Tauber pages 207-224

Note. F.F. Nord pages 225-230