Lush, J.L. Dedication of the Jay L. Lush Auditorium. 281

Jacobsen, T.W., and .W. Bachmann. Calculation of water temperatures in Clear Lake, Iowa. 285

Carter, O.G. Detailed yield analysis of the effect of different planting dates on seven soybean varieties. 291

Dornhoff, G.M., and R. Shibles. Soybean leaf net CO₂-exchange as influenced by experimental environment and leaf age. 311

Wittrock, D.D,, and M.J. Ulmer. Helminths of badgers, Taxidea taxus (Schreber), in northwest Iowa. 319

Dawson, J.L., P.N. Hinz, and J.C. Gordon. Hiking-trail impact on Iowa streamvalley forest preserves. 329

Boles, D.E. Special governmental districts in the 1970's: a study in legal legerdemain and political palliatives. 339

Brown, M.J. Paraglomerular diverticula of the distal tubule in the canine kidney- a preliminary report. 355