Note: Books received for editorial consideration will be intermittently listed. This acknowledgment must be regarded as an adequate expression of appreciation for the courtesy of the author or publisher. Selections will be made for review in the interest of our readers.

Rosenau's Preventive Medicine and Hygiene. By Kenneth F. Maxcy, Professor of Epidemiology, Johns Hopkins University School of Hygiene and Public Health, with 26 contributors. 7th edition. 1,462 pp., 131 illustrations, frontispiece in color. New York, Appleton-Century-Crofts, Inc., 1951. Price $14.00.

Tropical Nutrition and Dietetics. By Lucius Nicholls, M.D., Director, Division of Nutrition, Ceylon; Nutrition Adviser to Commissioner-General, South East Asia. 3d edition. 476 pp., illustrated. London, Ballière, Tindall & Cox; Baltimore, The Williams & Wilkins Co., 1951. Price $6.00, 42/.

Biological Antagonism. The Theory of Biological Relativity. By Gustav J. Martin, Sc.D., Research Director, The National Drug Co., Philadelphia. 516 pp., 64 figures. Philadelphia, The Blakiston Co., 1951. Price $8.50.

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