The Determination of Characteristics Involved in the Ability to Drive an Automobile With Emphasis on the Reactions of the Driver. LaVerne Johnson and J.E. Evans pages 415-440

Examination of Butter With the Burri Smear Culture Technic. H.F. Long and B.W. Hammer pages 441-450

A Logarithmic Sector and a Slit for Use in Spectographic Analysis. Harley A. Wilhelm pages 451-454

Equilibrium of a Thin Plate Symmetrically Loaded on a Flexible Subgrade. D.L. Holl pages 455-460

Notes pn the Internal Anatomy of Canton laevis Drury. Robert H. Cooper pages 461-466

Effect on Fumigation of Wheat on Amylase Content. Vera Dawson Martin pags 467-470

Zeros of a Class of Polynomials Associatd With Bateman's K-function. J.M. Bates pages 471-474

Hygroscopicity as a Factor in the Thermal Conductivity of Loose-fill Insulators. H.E. Ruff pages 475-484

Oxidative Degradation of Silk. II. Minnie Lichte and Rachel Edgar pages 1-4

Seed Impermeability and Viability of Native and Introduced Spcies of Leguminosae. Mary Erne-Jean Hutton and R.H. potter pages 5-24

Strophostyles helvola (L.) Britton, Its habits and Probable Value on Eroded Areas. John N, Martin pages 25-36

Ground State of the Li Atom. Charles P. Wells pages 37-42

Mammals of Iowa, Thos. G. Scott pages 43-98

Abstracts of Doctoral Theses. pages 99-180

The Food and Cover relationship in the Winter Survival of the Ring-necked Pheasant, Phasianus colchicus torquatus Gmelin, in Northern Iowa. William Edward Green pages 285-314

Buckling Loads for Edge Loaded Clamped Plates. Donald H. Rock pages 315-320

A Flora of Winneshiek and Allamakee Counties and Clayton County in the Vicinity of McGregor. William L. Tolstead pages 321-384

A Colorirmetric Method for the Microdetermination of Diacetyl. E.A. Prill and B.W. hammer pages 385-396

Cytologial and Morphological Features Associated with Impotency of Pollen of the Winesap Apple. John N. Martin pages 397-404

The Influence of the Ration on Mortality from Caecal Coccidiosis in Chicks. Elery R. Becker and Philip C. Waters pages 405-414

A Report of Some Recent Studies on Species of Gasterophilus Occuring in Horses in the United States. R.W. Wells and E.F. Knipling pages 181-204

Fractionation of Oat Hull Lignin. Wilbur S. Claus and Ralph M. Hixon pages 205-210

Biological Assay of Feeding Stuffs in a basal Ration for Coccidium-growth-promoting Substance II. Barley, Rye, Wheat Bran, Wheat Flour Middlings, ZSoy Bean Meal. Elery R. Becker and Russel C. Derbyshire pages 211-216

The Development of Vascular Tissues and the Initiation of the Inflorescence in Holcus sorghum. Chao-Hsi Chen pages 217-226

Notes on North American Spiders of the Families Gnaphosidea, Anypaenidae, and Clubionidae. Irving Fox pages 227-244

Behavior of Butyric Acid-butyl Alcohol Bactria Toward Acetylmethylcarbinol and Asparagin. R.W. Brown, G.L. Stahly, and C.H. Werkman pages 245-252

An Interesting texas Cucurbit, Cucurbita pepo, L. var. ovifera Alef. (C. texana, Gray). A.T. Erwin pages 253-262

Zeros of the Legendre Polynomials. E.R. Smith pages 263-274

Dissimilation of Intermediary Compounds in the Butyl-isopropyl Alcohol Fermentation. O.L. osburn, R.W. Brown and C.H. Werkman pages 275-284