Relation among three maturity measurements and yield of grain in corn. Arnel R. Hallauer, C.D. Hutchcroft, M.T. Hillson and R.L. Higgs 121

Relation of nitrogen and light intensity to growth, photosynthesis and respiration of green ash seedlings. F.S. Broerman and G.E. Gatherum. 137

Geometrical properties of depressions in north-central Iowa. C.T. Haan and H.P. Johnson. 149

Quantitative studies of the benthic fauna of Clear Lake, Iowa. Roger J. Mrachek and Roger W. Bachmann. 161