Taxonomic rvision of the genus Gymnopogon (Gramineae). James Payne Smith, Jr. 319

An annotated list of the bids of Iowa. Woodward H. Brown. 387

Robin mortality in relation to dutch elm disease control programs on the Iowa State University campus. Milton W. Weller. 471

Effect of feeding a combination of antibiotics at 1-,2- or 3-day intervals on incidence of legume bloat in cattle. P.R. Shellenberger, N.L. Jacobson, and A.D. McGilliard. 477

Radar and visual sightings of tornadoes during the summers of 1967-68 within central Iowa. Harry C. Vaughan and Bruce D. Langfitt. 481