REVIEWS 335 



illustrate the methods employed. Both by his practical work and by text- 

 books the author has brought credit to the study of crystallography, and these 

 volumes will assuredly be handed down to future generations as a standard 

 work. Edgar D. Mountain. 



METALLOGHAFHY 



Metallography. By C. H. Desch, D.Sc, Ph.D. Third Edition. [Pp. xi 

 -1- 440, with 14 plates and 105 diagrams.] (London : Longmans, 

 Green & Co., 1922. Price 165. net.) 



A BOOK by Prof. Desch and the fact that it is a third edition are sufficient 

 assurances of reliability and excellence. His textbook on Metallography is 

 widely known and has been used by many who have studied the subject. 

 In the present edition the general plan and arrangement of the original are 

 retained, but the text has been revised throughout and brought up to date. 

 Important changes have been made in the chapter on the Physical Properties 

 of Alloys. In the section on Hardness the Brinell test and the Ludwik modifi- 

 cation are given, and also the recently devised method by Moore for thin 

 sheets of metal. In the section on Electrical Conductivity there are brief 

 accounts of recent work, including the experiments of Kamerlingh Onnes on 

 metals at very low temperatures — about 2° above the absolute zero. The 

 chapter on Electromotive Force and Corrosion has to a great extent been 

 rewritten in order to cover the results of recent investigations. There are 

 several changes in the chapter on the Metallography of Iron and Steel, the 

 modern views on the allotropic condition of iron being included. The whole 

 chapter gives a very concise account of our present knowledge. The Appendix, 

 which gives a comprehensive and valuable list of systems, has been much 

 enlarged ; while throughout the book the references are complete and useful. 



The Analysis of Non-Ferrous Alloys. By F. Ibbotson, D.Met., B.Sc, F.I.C.. 

 and L. Aitchison, D.Met., B.Sc, A.I.C. Second Edition. [Pp. ix 

 + 246, with 20 diagrams.] (London : Longmans, Green & Co., 1922. 

 Price 125. 6d. net.) 

 It is satisfactory to know that this book has proved so successful as to demand 

 another edition. The aim of the authors was to collect those methods of 

 analysis of the non-ferrous metals which were not only accurate but at the 

 same time convenient and rapid. In recent years, owing to our increased know- 

 ledge of non-ferrous alloys and their heat treatment, they have been more and 

 more widely adopted, so that a book of this kind serves a most useful purpose. 

 The greatly extended use of the light alloys of aluminium has made it 

 necessary for methods of analysis of these alloys to be included in the new 

 edition. The methods given are reliable and convenient. In the analysis of 

 these alloys the chief difficulty is the accurate determination of the zinc 

 content, and to meet this the authors have considered the separation of 

 aluminium from zinc somewhat fully, a chapter being devoted to the subject. 

 Among the additions are methods for the analysis of alloys of nickel with 

 copper and with chromium and iron, and methods for the determination of 

 iron and manganese in brasses and bronzes. 



The methods have aU been carefully selected and are clearly described. 

 The new edition should prove useful to the works' chemist and for students 

 taking a more advanced course of analysis. 



An Introduction to the Study of Metallography and Macrography. By Leon 

 GuiLLET, D. es Sc, and Albert Portevin. Translated by L. 

 Taverner, with an Introduction by H. C. H. Carpenter. [Pp. xvi 

 -f- 289, with 562 illustrations.] (London : G. Bell & Sons, 1922. 

 Price 30S. net.) 

 This book is a distinct addition to our literature, particularly on account of 

 the excellent way in which the subject is presented. The authors state that 



