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