THE sinkage of logs during the river journey to the pulp-wood mills is a matter of considerable importance owing to the loss thereby incurred. The question has formed the subject of research by Prof. G. W. Scarth, Botanical Department, McGill University, and Mr. E. C. Jahn, associate professor of chemistry, School of Forestry, University of Idaho, the work being assisted by funds contributed by the Canadian Pulp and Paper Association. A paper on “Sinkage Studies—I.” has now been published (Can. Jour. Research, vol. 2, June 1930). Experiments were made with logs of jack pine, spruce, poplar, balsam, and birch.