To the 323 pages comprising a reprint of the 4th edition of 1915 have been added 53 pages dealing with modern treatment of natural perfume materials; synthetics and specialties, their place in perfuming; discretion in fixatives; care and aging of perfumes; alcohol problems; toilet creams; soap perfuming; almond oil and its substitutes; distinctive perfume advertising; care in the presentation of perfumes and toilet preparations; the importance of correct packing.

Austin, William E. Principles and practice of fur dressing and fur dyeing. New York: D. Van Nostrand Company, 1922. vi, 191 p. illus. 8°. $4.00. VMG (121)

This, the first authoritative and complete work in English, is designed to serve as a textbook for students and as a practical handbook. Fundamental principles are discussed in the light of the most recent chemical and technical developments. Factory processes and methods are described, and working for. mulas given. Chapter 1 covers a list of furs and brief descriptions. A bibliography of books and articles is appended.

Ballard, William C. Elements of radio telephony. New York: McGraw-Hill Book Co., Inc., 1922. x, 132 p. illus. 12°. $1.50. TTF (121)

Well-illustrated, non-mathematical, and elementary account of what happens when messages are sent and received by radio, and of the apparatus required; as well as information for the experimenter who desires certain results but who does not know what apparatus is necessary. Author is Assistant Professor of Electrical Engineering in Cornell University.

Batson, R. G., and J. H. HYDE. Mechanical testing, a treatise in two volumes. Volume 1. Testing the materials of construction. London: Chapman & Hall, Ltd., 1922. xiii, 413 p. 8°. 21s. VEE (121)

Volume 1 deals with fundamental principles and describes various machines and test methods, with chapters on ordinary commercial testing, and the testing of such materials as hard drawn wire, cast iron, timber, stone, brick, concrete, road materials, limes and cements. There is also a chapter on autographic recording instruments. Reading references at the end of each chapter. Authors are associated with the British National Physical Laboratory.

"Its scope and usefulness are really rather greater than perhaps its title would indicate, because in addition to descriptions, theory, and uses of testing machines of every conceivable kind, there are excellent chapters on stress, strain, elastic constants of all kinds, their inter-relations, etc.. The book is first class throughout and to be highly recommended." Concrete and constructional engineering, April, 1922.

Bell, Louis. The telescope. New York: McGraw-Hill Book Company, Inc., 1922. ix, 287 p. illus. 8°. $3.00. ONL

Traces the evolution of the telescope, describes optical glass, the properties of objectives and mirrors, mountings, eye-pieces, hand telescopes and binocu lars, accessories, the testing and care of telescopes, setting up and housing the telescope, and seeing and magnification.

Beaumont, Roberts.

Wool substitutes. New York: Sir Isaac Pitman & Sons, Ltd., 1922. xiv, 190 p. illus. 8°. $3.00. VLMD (121)

Treats of the artificial wool problem; reclaimed or recovered wool; mungo and shoddy; extract wool; noils, pulled yarn materials, flocks; blending; yarn preparation; and manufacture of various kinds of cloths. Finely illustrated.

Bingham, Eugene C. Fluidity and plasticity. New York: McGraw-Hill Book Co., Inc., 1922. xi, 440 p. illus. 8°. $4.00. PCD (118)

Of special interest to chemists in plants manufac turing rubber, ceramics, artificial silk, artificial leather, lacquers, glue, paints, and lime; also to metallurgists and chemists dealing with lubricants. Has a bibliography of 83 pages.

"In producing an up-to-date book on these subjects the author is fully justified. The work fills a gap in scientific literature, in that it deals, in a very lucid manner, with a collection of hitherto widely diffused information... Many imperfectly understood and neglected phenomena concerning plastic and viscous flow, etc., are shown to be capable of correlation, and receive clear and extensive treatment; and the information set forth should prove of considerable value in the diagnosis and treatment of many more or less obscure industrial difficulties." Chemical age, London, June 17, 1922.