The Physical-Chemical Properties of Alcohol-Gasoline Blends. III. The A.S.T.M. Distillation Curves and Reid Vapor Pressure. Leo M. Christensen, R.M. Hixon, and Ellis I. Fulmer pages 237-244

The Physical-Chemical Properties of Ethyl Alcohol Gasoline Systems. IV. Influence of Alcohol Concentration Upon Specific Volume, Fluidity, Air-to-fuel Ratio, Calorific Value, Latent Heat, and Fall in Temperature on Evaporation. Leo M. Christensen, R.M. Hixon, and Ellis I. Fulmer pages 245-250

A Botanical Survey of Lee County, Iowa. Jess L. Fults pages 251-294

Linkage Data on the R-g1 Chromosomes of Maize. J.B. Wentz and S.N. Smith pages 295-302

Irregular Sporogenesis and Polyembryony in Some Leguninosaw. John N. Martin and John R. Watt pages 303-309

Notes on the Immigrant Flora of Iowa, I. R.I. Cratty pages 309-312

Phyllophaga of Iowa. Bernard V. Travis pages 313-366

Redescriptions of North American Smithuridae. J.W. Folsom pages 461-512

Observations on Hexamita mamotae, n.sp., a Protozoan Flagellate from the Woodchuck (Marmota monax Linn,). H.B. Crouch pages 513-518

An Entomotograph, an Instrument for Recording the Appendicular of Locomotor Activity of Insects. J. Franklin Yeager and Ralph B. Swain pages 519-526

Trypansoma iowensis n.sp. and Babesia citelii n.sp. from Citellus tridecemlineatus, and Trypansoma hixsoni n.sp. from Citellus franklini. Elery R. Becker and Robert L. Roudabush pages 527-532

The Development of Trypanosoma iowensis in the Blood of the Striped Ground Squirrel, Cittellus tridecemlineatus. Robert L. Roudabush and Elery R. Becker pages 533-536

Three New Trichomonads from Birds. Bernard V. Travis and F. N. Hamerstrom Jr. pages 537-543

The Concentration of Carbon Dioxide in the Soil Air Under Various Crops and in Fallow Soils. F.B. Smith and P.E. Brown pages 1-16

A Comparative Analysis of Three Hundred Fabrics. Rachel Edgar pages 17-74

On the Chi-Square Test for Homogeneity. George W. Snedecor and M.R. Irwin pages 75-82

A Catalog and Host-Index of the Species of the Coccidian genus Eimeria. Norman D. Levine and E.R. Becker pages 83-106

Report on the Food of Five of Our Most Important Game Ducks. W. F. Kubichek pages 107-126

Bobwhite Winter Survival in the Area Heavily Populated with Grey Foxes. Paul L. Errington pages 127-130

Pseudomonas rhizogenes (R.B.W.K, and S.); Its Host Relations and Characteristics. R.F. Suit pages 131-174

The Physical-Chemical Properties of Alcohol-Gasoline Blends II. The Influence of Anhydrous Ethyl Alcohol Concentration Upon Water Absorption. Leo M. Christensen, R.M. Hixon, and Ellis I. Fulmer pages 175-180

Abstracts of Doctoral Theses pages 181-236

Growth and Sexual Maturity in Brahma and Leghorn Fowl. Nelson F. Waters pages 367-384

Sweet Corn-Its Origin and Importance as an Indian Food Plant in the United States. A.T. Erwin pages 385-390

On the Rates of Contraction of the Isolated Heart and Malpighian Tube of the Insect, Periplaneta orientalis: Method. J. Franklin Yeager and Anna Hager pages 391-396

The Alkaline Hydrolysis of Cellulose Acetate Rayon. Marion Weston, Van Ess, and Rachel Edgas pages 397-408

The Decomposition of Straw in the Production of Artificial Manure, F.B. Smith and P.E. Brown pages 409-415

The Butyl-Acetone Fermentation in Sugar-Media. Hoard Reynolds, H.D. Coile and C. H. Werkman pages 415-426

The Effect of Dry-Cleaning and Mechanic Cleaning Upon Furs. Katherine Cranor, Velma Fisher, Alice Sundt, Louise Perin, Alwine Meyer, and Verna Clark pages 427-448

The Plasmodesms in the Leaves and Stems of Some Angiosperms. John N. Martin pages 449-460