THE small handbook entitled “The Rationalization and Conservation of the Timber Resources of the World” (The Technical Press, Ltd., London. 2s. 6d. net), by Dr. A. Harold Unwin, is written mainly with reference to the amelioration of the 'Special Areas' and general improvement of woodlands. Dr. Unwin puts forward a series of proposals and suggestions of a somewhat varying nature. In the short period since the Great War, a number of organizations have come into being in connexion with forestry and timber utilization in Great Britain and the Empire. To mention but three, the Forestry Commission, the Forest Products Research Laboratory at Princes Risborough and the Imperial Forestry Institute at Oxford. The timber trade has also a considerable organization. Dr. Unwin wishes for a more rational care of trees and woodlands, especially in Great Britain, and for a better and organized utilization of the world's timber resources. Until recently, Dr. Unwin was conservator and head of the Forest Service in Cyprus, having previously served in Nigeria. Although there is much in the handbook of interest, the same cannot be said of the practicability of some of the proposals. The list of trees given at the end requires considerable revision, and would have been more serviceable had it included the botanical names.