Volume 18, Bulletins 202-209. (202) Inbreeding in the White Leghorn Fowl; (203) Chemical Analyses of Iowa Soils for Phosphorus, Nitrogen and Carbon: a Statistical Study; (204) Genetic Aspects of the Danish System of Progeny--Testing Swine; (205) Oxidation of Acetylmethylcarbinol to Diacetyl in Butter Cultures; (206) Classification of the Organisms Important in Dairy Products; (207) Masonry Barn Design and Construction; (208) Relation of Reserves to Cold Resistance in Alfalfa; (209) Economics of Agricultural Land Use Adjustments: I. Methodology in Soil Conservation and Agricultural Adjustment Research