Haemoproteus beckeri n. sp. Trypanosoma laverani var. tox-ostomae n. var. from the Brown Thrasher (Toxostoma rufum). Robert L. Roudabush and G. Robert Coatney pages 1-6

An Electron Tube Nul-instrument for Use With the Glass Electrode and a Description of a Rugged Type of Glass Electrode. Lyle D. Goodhue pages 7-16

A Comparative Study of the Several Strains of the So-called Radiobacter. F.B. Smith and P.E. Brown pages 17-26

A Design for Testing Technique in Codling Moth Spray Experiments. T. Roy Hansberry and Charles H. Richardson pages 27-36

Observations on Yeasts Causing Gas in Sweetened Condensed Milk. H.C. Olson and B.W. Hammer pags 37-44

The Alkaline Mercerization of Wool. Mildred Barr and Rachel Edgar pages 45-48

Abstracts of Doctoral Theses. pages 49-114