Aquatic Phycomycetes (exclusive of the Saprolegniaceae and Pythium). By Frederick K. Sparrow, Jr.

The Permeability of Natural Membranes. By H. Davson and J. F. Danielli.

Die Ostgrenze Fennoskandiens in pflanzengeographischer Beziehiwg. By Aarno Kalela.

A Hand-book of Plant-Tissues Culture. By P. R. White.

Ecological Crop Geography. By Karl H. W. Klages.

An Introduction to Plant Physiology. By W. O. James.