Apgar, A. G., Trees of the Northern United States. N. Y.: American Book Co., 224 pp. A small book dealing with the botany of trees, giving descriptions of their essential organs, and particularly valuable for the leaf key to the trees. It should be supplemented by Keeler or Hough's Handbook.

Baterden, J. R., Timber. N. Y.: D. Van Nostrand Co., 1908, 351 pp. A description of the timbers of various countries, discussion of timber defects, timber tests, etc.

Bitting, K. G., The Structure of Wood. Wood Craft, 5: 76, 106, 144, 172, June-Sept., '06. A very scholarly and valuable series of articles on wood structure and growth. Excellent microphotographs.

Britton, Nathaniel Lord, North American Trees. N. Y.: Henry Holt & Co., 1908, 894 pp. A description of all the kinds of trees growing independently of cultivation in North America, north of Mexico, and the West Indies. The standard Botany of trees.

Boulger, G. S., Wood. London: Edward Arnold, 369 pp. A thoro discussion of wood structure, with chapters on the recognition and classification of woods, defects, preservation, uses, tests, supplies, and sources of wood. Good illustrations.

Bruce, E. S., Frost Checks and Wind Shakes. Forestry and Irrigation, 8: 159, April, '02. An original study of the splitting of trees by sudden frost and thaw.

Bruncken, Ernest, North American Forests and Forestry. N. Y.: G. P. Putnam's Sons. 265 pp. A comprehensive survey of American Forestry conditions including the forest industries, fires, taxation, and management. No illustrations.

Busbridge, Harold, The Shrinkage and Warping of Timber. Sci. Amer. Suppl., No. 1500, Oct. 1, 1904. Good photographic illustrations.

Comstock, J. H. and A. B., A Manual for the Study of Insects. Ithaca, N. Y.: Comstock Publishing Co., 701 pp. Valuable for reference in classifying insects injurious to wood.

Curtis, Carleton