From the Editors. 325

Carr, P. H., W.P. Switzer, W.F. Hollander. Evidence for interference with navigation of homing pigeons by a magnetic storm. 327

Coleman, T.L. and T.E. Fenton. A reevaluation of mathematical modes for predicting various properties of loess-derived soils in Iowa. 341

George, J.R. and K.E. Hall. Herbage cation concentrations in switchgrass, big bluestem, and Indiangrass with nitrogen fertilization. 353

Lawrence, B.K. and W.R. Fehr. Reproductive response of soybeans to short day lengths. 361

Bueno, A. and .E. Atkins. Growth analysis of grain sorghum hybrids. 367

Meixner, M.L. La Chagallite: The style in tapestry. 838

Lang, J.M. and D. Isley. Eysenhardtia (Leguminosae: Papilionoideae). 393

Williams, D.D. The known Pratylenchidae (Nematoda) of Iowa. 419

Ghidiu, G.M. and E.C. Berry. A seed corn maggot trap for use in row crops. 435

Lewis, L.C. Present status of introduced parasitoids of the European corn borer, Ostrinia nubilalis (Hubner), in Iowa. 429

Contents, Iowa State Journal of Research, Vol. 56 (August, 1981-May, 1982). 437