Mold flora associated with shelled corn in Iowa. R.W. Lichtwardt, G.L. Barron, and L.H. Tiffany. 1

A method for the determination of progesterone in tissues and body fluids. J.M. Rakes, W.R. Hearn, R.M. Melampy. 13

Lequminosae: Psoraleae of the United States. A generic summary. Duane Isely. 23

A study of the weight of the corpus luteum during pregnancy in the cow. R.M. Melampy an D.G. Gay. 37

A comparison of different types of stalls for dairy cattle. C.F. Foreman, N.H. Curry, P.D. Homeyer, and A.R. Porter. 43

Numbers of mature walleyes in Clear Lake, Iowa, 1952-53, as estimated by tagging. Richard R. Whitney. 55

A nonvisual method for transport numbers in pure fused salts. II. Frederick R. Duke and James P. Cook. 81

Induced estrus in ovariectomized cows. R.M. Melampy and J.M. Rakes. 85

The erosion-littoral zone of North Twin Lake, and its relation to dredging. John B. Owen. 91