From the Editors. 1

Bancroft, T.A. Roots of the Iowa State University Statistical Center: 19140-1950. 3

Chang, H.C. Rural fertility as a demographic response: The case of the North Central Region, 11

Harder, H.J., R.E. Carlson, and R.H. Shaw. Photosynthesis in corn in relationship to limited soil water. 21

Jungst, S.E. and D.W. Countryman. Two regression models for projecting future wilderness use, 33

McClelland, J. and R.P. Hughes. Toward a procedure for evaluating parenthood education. 443

Jones, S.B. and G.G. Brown. A comparative immunological study of sperm antigens in the guinea pig, Cavia porcellus, rooster, Gallus domestica, and painted turtle, Crysema picta. 51

Mize, C.W., V.L. Hartz, and H. Ramirez-Maldonado. Fuelwood volume tables for northern red and white oak in Iowa. 65

Stotlar, D.K. Litigation involving the athletic scholarship. 77

Sadehdel-Moghaddam, M., P.J. Loesch, Jr., W.J. Wiser, and A.R. Hallauer. Interrelationships and inheritance of protein quality and agronomic traits in an opaque-2 synthetic of maize (Zea mays L.) 85

Wallace, S.U., S.J. Henning, and I.C. Anderson. Elongation, Al concentration, and hematoxylin staining of aluminum-treated wheat roots, 97