Alkyl-Aryl Lead Compounds. Anti-Knock Studies. Henry Gilman, O.R. Sweeney, and J.E. Kerby pages 1-4

Thermal Conductivity of Glasses Transmitting Ultra-Violet Light. Wm. Kunerth and Wm. Berkey pages 5-6

Studies in Home Cleaning. III. Heat Penetration in Meats and Vegetables Processed in Glass Containers. Gail M. Redfield, P. Mabel Nelson and Gertrude Sunderlin pages 7-28

Catalase and Oxidase of the Tomato as Influenced by the Soil Reaction. E.S. Haber pages 29-40

New and Little Known Neotropical Tingitide. Carl J. Drake pages 41-56

The Fermentation of Cornstalks and Their Constituents. I. Studies on the Pectin-Fermenting Bacteria. Lloyd Allen Burkey pages 57-100

Suctoria of the Large Intestine of the Horse. Ta-Shih Hsiung pages 101-104