[Volume 25, Bulletins 281-303. (281) Analysis of Lattice and Triple Lattice Experiments in Corn Varietal Tests: I. Construction and Numerical Analysis, II. Mathematical Theory; (282) Performance of Electric Roasters; (283) Bacteriology of Cheese: V. Defects of Blue (Roquefort-Type) Cheese; (284) Quality of Butter Made from Vacuum-Pasteurized and Vat-Pasteurized Lots of the Same Creams; (285) Classification of the Organisms Important in Dairy Products: III. Pseudomonas putrefaciens; (286) Precast Tile Beam Floor; (287) Pythium GraminicolaSubr. on Barley; (288) Farm Taxes and the Cost of Public Services in Relation to Land Resources in Ringgold County, Iowa; (289) Examination of the Accuracy of Lattice and Lattice Square Experiments on Corn; (290) Flavor Development in Salted Butter by Pure Cultures of Bacteria, Preliminary Results; (291) Bacteriology fo Cheese: VI. Relationship of Fat Hydrolysis to the Ripening of Cheddar Cheese; (292) Transmission Tests of Maize Mutants Induced by Ultra-Violet Radiation; (293) Incoming and Outgoing Payments of Iowa Farm Families; (294) Viability and Germination of Seeds of Convolvulus Arvensis L. and Other Perennial Weeds; (295) Strawberry Production in Southeastern Iowa as Influenced by Varieties, Fertilizers and Cultural Practices; (296) Influence of Cultural Factors on Alfalfa Seeding Infection by Pythium debaryanum Hesse; (297) Tables of Orthogonal Polynominal Values Extended to N=104; (298) Effects of Crop Acreage Control Features of AAA on Feed Production in 11 Midwest States; (299) Poultry Products Research: A Guide for Research Workers, Including a List of Some Problems in Project Form; (300) Estimation of Income Tax Revenue and Incidence; (301) Diacetyl and Acetylmethylcarbinol Production in the Manufacture of Unsalted Butter; (302) Methods of Computing a Regression of Yield on Weather; (303) Prices of Farm Products in Iowa, 1851-1940