The Distribution of Symmetric Quadratic Forms in Normal and Independent Variables. Gerhard Tinter pages 231-234

The Effect of the Ingestion of Irradiated yeast, Molds, and Ergosterol on the Antirachitic Potency of Ewe's Milk. William Gordon Kirk pages 235-238

Noteworthy Additions to the Collection of Mammals from Iowa in 1938. Thos. G. Scott pages 239-242

Biological Assay of Feeding Stuffs in a Basal Ration for Coccidium-growth-promoting Substance. III. Dried Fish Meal, Alfalfa Meal, White Wheat Flour. Elery R. Becker and Phillip C. Waters pages 243-248

Factors Affecting the Milk Production of Simmenthaler Grade Cows Under the Penkeeping System. Geraldo O. Carneiro pages 249-268

A Gas-Type X-Ray Tube. L.E. Pinney pages 269-274

Occurrence of Acrolein as an Intermediate During the Fermentation of Glycerol by the Coli-aerogenes Bacteria. Howard Reynolds, W.M. Hoehn, and C.H. Werkman pages 275-278

The Effect of the Concentration of Mannitol upon the Production of Levulose by the Action of Aerobacter suboxydans. E.I. Fulmer, J.W. Dunning, and L.A. Underkolfer pages 279-282

Equipment for Radiography with Soft X-Rays. F.M. Bailey and G.W. Fox pages 283-292

Some Experiments with Fertilizers for Evergreen Seedlings. J.A. Larsen and W.G. Stump pages 293-312