THE subject matter of the book written by J. Messrs. Jeffries and Archer falls under the general heading of metallography. The authors inform us that about half of it has already been published in Chemical and Metallurgical Engineering, and that an effort has been made to make each chapter, to some extent, self-contained. One consequence of this is that there is a considerable amount of repetition. The authors are aware of this, but state that they do not consider this an objectionable feature, “since in general the material repeated is of such importance that it will stand repetition.” As to this, opinions will perhaps vary, but it may be pointed out that the deformation of metals is treated in no less than six out of the twelve chapters of the book. The repetition, moreover, is not merely of the subject matter, but of the actual language used. Pages 149–50 are identical, word for word, with pages 403–5. Since the book is written by two Ameri cans, there is a certain satisfaction in pointing out the work referred to in the above pages is English. (1) The Science of Metals. Zay Jeffries Robert S. Archer. Pp. xvii + 460. (New York: McGraw-Hill Book Co., Inc.; London: McGraw-Hill Publishing Co., Ltd., 1924.) 25s. net. (2) The Corrosion of Metals. Ulick R. Evans. Pp.xi + 212. (London: E. Arnold and Co., 1924.) 14s. net. (3) Cadmium: its Metallurgy, Properties and Uses. Dr. Norman F. Budgen. (Griffin's Scientific Text-Books.) Pp. xv + 239. (London: C. Griffin and Co., Ltd., 1924.) 21s. net.