THE present number of this important bibliography (13, No. 11, January to June, 1942), published at the Dominion Observatory at Ottawa by Ernest A. Hodgson with the assistance of four collaborators, maintains its previous high standard. There are seventy-seven items culled from world-wide sources covering topics from the strength of rock materials to world structure. Many items concern patents for geophysical prospecting such as item 5326, Williams, P. S., “ Seismic Exploration Method”, U.S. Patent 2,253,358, Aug. 19, 1941, and Beers, R. F., “ Means for Analysing and Determining Geologic Strata”, U.S. Patent 2,249,108, July 15, 1941. Items from NATURE and Science News Letter are included. There has been some discussion recently concerning the geology of the beds of the oceans especially near shore-lines. This enhanced interest is mirrored in item 5313, Jones, O. T., “Continental Slopes and Shelves”, Geographical Journal, 97, No. 2, 80-99 (London, Feb., 1941) ; and in item 5341, Shepard, Francis P., and Emery, K. O., “Submarine Topography off the California Coast”, Geological Society of America Special Publications, No. 31, 171 pp., 4 charts, 18 pi., 42 fig. (New York, 1941). Reginald A. Daly made a contribution to NATURE concerning “Glaciation and Submarine Valleys” on Feb. 7, 1942 (pp. 156-60), item 5291.