The development of Eimeria brunetti Levine in the digestive tract of chickens. Janet I. Boles and Elery R. Becker 1

Physiology of Endoconidiophora fagacearum Bretz. I. Factors influencing growth and toxin production. P.F. Hoffman 27

The winter-spring movements of the ring-necked pheasant in northern Iowa. Henry G. Weston Jr. 39

The fall population European corn borer survey. T.A. Bancroft, T.A. Brindley, R. Bowles, and P.C. Tang 61

A search for resistance to the injury caused by species o Diabrotica in the corns of Guatemala. Irving E. Melhus, Reginald H. Painter, and Frank O. Smith 75

Relative toxicity of legume seed protectants to two species of Rhizobium. G.W. Peterson and W.F. Buchholtz 95

Cytohistological responses of plant meristems to maleic hydrazide. John B. Carlson 105

Isolation of cellulose-digesting microorganisms of the rumen, Warren D. Kitts, P.H. Carr, and L.A. Underkofler 129

The development of the embryo of Zea in relation to position on the ear. Max E. Bell 133

The rate of ammonia production in the acid hydrolysis of vitamin B₁₂ . John M. Brierly, Robert R. Sealock, and Harvey Diehl 141

Effects of heating vitamin B₁₂ in a stream of dry nitrogen at various temperatures. Richard A. Murie and Harvey Diehl 143

Effects of natural selection in segregating generations up bulk population of barley. L.H. Taylor and R.E. Atkins 147