The enlarged heat drop tables, H. P. Gauge Pressures, L. P. Absolute Pressures: Calculated by Herbert Moss, D.Sc., A.R.C.S., D.I.C., Imperial College of Science and Technology, from the formulae and enlarged steam tables of Prof. H. L. Callendar, M.A., LL.D., F.R.S. 88 pages, 8vo, cloth. London, Edward Arnold and Company, and New York, Longmans, Green and Company, 1925. Price, $3.75