Lectures on the Inorganic Nutrition of Plants. By D. R. Hoagland.

Uredineana, Recueil d'Études Systématiques et Biologiques sur les Urédinées du Globe. Edited by A. L. Guyot.

Postglacial Forest Succession, Climate, and Chronology in the Pacific Northwest. By Henry P. Hansen.

Der Lindenmischwald (Tilieto-Asperuletum taurinae) des schweizerischen voralpinen Föhnund Seenbezirkes, seine pflanzensoziologische und forstliche Bedeutung. By Dr Walter Trepp.

The Grasslands of Latin America. By G. M. Roseveare.

The Diseases of the Flax Plant (Linum usitatissimum Linn.). By Arthur E. Muskett and John Colhoun, with a Foreword by Rev. The Right Hon. Robert Moore

Biology of Pathogenic Fungi. Edited by Walter J. Nickerson, with a Foreword by J. G. Hopkins.