Notes on Cucurbita moschata, Duch. A.T. Erwin pages 213-222

Four New Thysanoptera, With a Preliminary List of the Species Occurring in Iowa. Dudley Moulton and Floyd Andre pages 223-234

Relative Toxicity of Certain Stomach Poisons to Phyllophaga lanceolata (Say) (Coleoptera-Scarabaeidae). Bernard V. Travis pages 235-242

The Toxicity of Certain Stomach Poisons to the June Beetle, Pyllophaga implicita (Horn). Floyd Andre and Phillip E. Pratt pages 243-248

The Penetration of Gaseous Pyridine, Piperidine and Nicotine Into the Body of the American Cockroach, Periplaneta americana L. Louise H. Glover and Charles H. Richardson pages 249-260

Studies on Alcaligenes viscosus. H.F. Long and B. W. Hammer pages 261-266

Eect of Treatment of Oats on the Development of Saccharogenic and Dextrinogenic Amylases During Germination. Nellie M. Naylor and Vera L. Dawson pages 267-274

Some Specific Taxonomic Characters of Common Lucilia Larvae-Calliphorinae-Diptera. Edward F. Knipling pages 275-294

A Macro-respirometer for the Study of Aerobic Bacterial Dissimilation. H.G. Wood, Carl Erb, and C.H. Werkman pages 295-302

Methylene Blue Reduction and Oxidation-reduction Potential Studies on Members of the Colon-aerogenes Group of Bacteria. Samuel S. Epstein pages 303-316

Laboratory Report on Tests to Determine Causes of Stretch and Slippage of Yarns in Certain Wool and Silk Fabrics. Katherine Cranor, Eleanor McFadden, and Lutie Fryer pages 317-340

Role of Phophoglyceric Acid in the Dissimilation of Glucose by the Propionic Acid Bacteria. R.W. Stone and C.H. Werkman pages 341-344