Flora of Alaska and Adjacent Parts of Canada. VII. J.P. Anderson pages 137-188

Report on Thirty-Five Drugs and Three Plant Materials Tested Against Plasmodium lophurae in the White Pekin Duck. Elery R. Becker pages 189-194

Life History and Management of the Yellow Pikeperch, Stizostedion v. vitreum (Mitchill), of Clear Lake, Iowa. Robert F. Cleary pages 195-208

The Use of Vertebrae As Indicators of The Age of The Northern Black Bullhead Ameirus m. melas (Rafinesque). William M. Lewis pages 209-218

Fermentative Utilization of Cassava. The Production of Ethanol. Jullian Banzon, E.I. Fullmer, and L.A. Underkolfer pages 219-236

The Post-Crisis In Blood-Induced Plasmodium lophurae Infections in White Pekin Ducls. Elery R. Becker, Charles E. Brodine, and Bonnie L. Clappison pages 237-248

Report on European Corn Borer Resistance Investigations. S.D. Beck and J.H. Lilly pages 249-260

Second Supplementary List of Parasitic Fungi From Iowa. J.C. Gilman pages 261-272

The Presence of Water In Oxygen-Carrying Cobalt Compounds. Harvey Diehl and Johanna Henn pages 273-278

The Reaction of Ferrous Iron with Nioxime. John Mathews, Jr, and Harvey Diehl pages 279-288

An Improved High Frequency Conductimetric Titration Apparatus. Robert J. Bever, Carl E. Crouthamel, and Harvey Diehl pages 289-296

The Rate of Precipitation of Barium Sulfate. Frederick R. Duke, Robert J. Bever, and Harvey Diehl pages 297-300

Abstracts of Doctoral Theses. pages 1-100

Note on an Invariant of Commutative Algebras. B. Vinograde pages 101-102

Aquatic and Shore Vegetation of Spirit Lake, Dickinson County, Iowa. William F. Sigler pages 103-124

Seed Characteristics of Common Clovers (Trifolium). Duane Isely pages 125-136

Histological Development of "Accessory Blade" and Associated Abnormalities in Maize. John E. Sass and G.F. Sprague pages 301-310

Life History of The White Bass in Storm Lake, Iowa. William F. Sigler pages 311-316

The Warmouth, Chaenobryttus coronarius (Bartram), in Red Haw Hill Reservoir, Iowa. William M. Lewis and Thomas S. English pages 317-322

Influence of Normal and Immune Duck Plasmas on Chick Infections of Plasmodium lophurae Induced With Parasites in Duck Erythrocytes. Elery R. Becker, Charles E. Brodine, Alice A. Marousek, and Dorwin A. Byrd pages 323-342

Growth and Food Habit Studies of Smallmouth Black Bass In Some Iowa Streams. William Harold Tate pages 343-354

Fisheries Investigations on Two Artificial Lakes in Southern Iowa. I. Limnology and Vegetation. William M. Lewis pages 355-362

The Bionomics of Dermestes maculatus Deg.: I. Oviposition, Longevity, Period of Incubation. John K. Scoggin and Oscar E. Tauber pages 363-374

Center of Flexure of Beans of Triangular Section. R.N. Gross pages 375-380

Torsion of Composite Sections. L.E. Payne pages 381-396

Stress Distribution Due to Hydrostatic Pressure On A Parabolic Boundry. Karl Leroy Conrad pages 397-404