A Monograph of the Protozoa of the Large Intestine of the Horse. Ta-Shih Hsiung pages 359-424

Studies on the Nitrogen Fixation in Some Iowa Soils. R. H. Walker and P.E. Brown pages 425-430

The Variation of Hydrogen Ion Concentration with Carbon Dioxide Pressure Above One Atmosphere. I. Colorimetric Measurement. Marjorie B. Moore with J.H. Buchanan pages 431-440

The Properties of Starch with Relation of Time of Formation of Starch Gels. O.W. Chapman with J.H. Buchanan pages 441-450

The Biological Estimation of Glucose. II. The Relation Between Glucose Concentration and the pH Change in Media. Amy Le Vesconte with J.H. Buchanan and Max Levine pages 451-458

Determination of Organic Acids. II. Determination of Mixtures of Two Fatty Acids by Partition Between Ethyl Ether and Water. C.H. Werkman pages 459-464

The Esterase and Protease of Penicillium roqueforti. N.M. Naylor, L. Weisbrodt Smith, and Helen Jo Collins pages 464-471