Studies on the Insect Fauna of Iowa Prairies. George O. Hendrickson pages 49-180

Clarification of Milk for American Cheddar Cheese. G. Wilster pages 181-214

Experiments on the Physiological Relationships Between the Stomach Infusoria of Ruminants and Their Hosts, With a Bibliography. Elery R. Becker, J. A. Schulz, and M. A. Emmerson pages 215-252

The Pigeon Fly and Pigeon Malaria in Iowa. C.J. Drake and R. M. Jones pages 253-262

Studies of Crowngall, Overgrowths, and Hairyroot on Apple Nursery Stock. J. H. Muncie and Ross F. Suit pages 263-314