APPLIED SEDIMENTATION A Symposium Edited by Parker D. Trask. A valuable new tool for geologists and engineers faced with the practical problems of sedimentation. The book contains 35 original articles, each a comprehensive subject summarized by a specialist. The articles are grouped under these seven topics: basic principles of sedimentation; engineering problems involving strength of sediments; applications of processes of sedimentation; applications involving nature of constituents; economic mineral deposits; petroleum geology problems; and military applications. Ready in March Approx. 674 pages Illus. Prob. $5.00 AN INTRODUCTION TO LUMINESCENCE OF SOLIDS By Humboldt W. Leverenz. A new book in the WILEY STRUCTURE OF MATTER SERIES, Maria Goeppert Mayer, Advisory Editor. The author describes phosphors in terms of preparation, compositions, structures, and physical characteristics, using specific examples to illustrate each general feature. The best present phosphors and their methods of application for use in "fluorescent lamps," cathode-ray tubes, electron microscopes, "radium dials," nuclear particle counters, and x-ray fluoroscope screens are covered. Ready in January 569 pages Illus.

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