The Colon-Typhoid Group of Bacteria and Related Forms. Relationships and Classification. John C. Weldin pages 121-198

Fungicidal Activity of Furfural. Harold H. Flor pages 199-224

Effect of Concentration and Temperature on Germicidal Efficiency of Sodium Hydroxide. Max Levine, J.H. Buchanan, and Grace Lease pages 379-394

The Nitrogen Metabolism of Nitrogen-Fixing Bacteria. W.V. Halversen pages 395-410

The Production of a Yeast Growth Stimulant by Heating Media Under Pressure. Ellis I. Fulmer and Bernice Huesselmann pages 411-418

The Isomeric Form of Lactic Acid Produced by Lactobacillus Acidophilus. L.S. Hyde and B.W. Hammer pages 419-428

A Summary of the Soil Fungi. J.C. Gilman and E.V. Abbott pages 225-344

The Protozoan Fauna of the Rumen and Reticulum of American Cattle. Elery R. Becker and Mary Talbott pages 345-372

Chemical Testing of Nicotine Dusts. R.M. Hixon and C.J. Drake pages 373-378

Linked Inheritance in Tomatoes. E.W. Lindstrom. Page 3

Taxonomic Studies on Soil Fungi. E.V. Abbott. Page 15

The Relation Between pH and the Reaction of Aqueous Solutions at Various Temperatures. Ellis I. Fulmer. Page 37

Nomogram for Determination of Generation Time and Velocity Coefficients for Rates of Growth and Death. R.E. Buchanan. Page 63

A Study of Crown Gall Caused by Pseudomonas tumefaciens on Rosaceous Hosts. J.H. Muncie. Page 67