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of hydrogen-ion concentrations in industry: amongst these are references to fermentation, baking, sugar, paper, leather, organotherapy, agriculture, milk, confectionery, textiles, and dyeing. A ten-page appendix on the subject of pH in acid-alkali titrations then follows, and it is here that the newer concept of acids and bases is particularly useful. The book is completed by a list of over two hundred and forty references, arranged in alphabetical order according to the names of the authors, and there is also a good subject index. It is not surprising to find a relatively large number of references t o Danish and Scandinavian literature, since the author is working in Copenhagen, but English, American, and German journals are well represented in the list. The book can be recommended as giving an excellent survey of the subject of hydrogen-ion concentrations; its viewpoint is up to date and i t is written in a clear and simple style. S. GLASSTONEL
Journal of the Institute of Metals. Volume LVI (Proceedings), No. 1, 1935. 306 pp.; 31 plates. Cloth. Edited by G. Shaw Scott, M.Sc., F.C.I.S. London: The Institute of Metals, 36 Victoria Street, Westminster, S.W.1. Price: $1. 11s. 6d. The latest volume of the Journal of the Institute of Metals, Volume LVI, No. 1, 1935, constitutes a complete record of the two most recent meetings of the scientific society that is responsible for the publication of this useful book. The respective gatherings were the Spring Meeting and the May Meeting, both held in London. At the latter Professor W. L. Bragg, F.R.S., delivered the twenty-fifth annual May Lecture, his subject being “Atomic Arrangement in Metals and Alloys.” This discourse-in which a n account of the theory of atomic arrangement in the crystalline structure of an alloy is given-is reproduced in full, and constitutes a valuable addition to scientific knowledge. It brings up-to-date the work that has been done on this subject since Professor Bragg’s father, Sir William Bragg, F.R.S., delivered a previous May Lecture-in 1916-on “X-rays and Crystalline Structure, with Special Reference to Certain Metals.” A dozen papers dealing with many aspects of metallurgical work make up the bulk of the present volume, these papers having been presented at the March Meeting of the Institute of Metals. , Two specially interesting groups are those dealing with fatigue in metals due either to atmospheric action or t o corrosion. Another group is devoted to the constitution or properties of tin alloys. “Unsoundness in Aluminium Sand Castings” and “The Mechanical Properties of Some Wrought Magnesium Alloys” are the titles of two other papers of considerable industrial importance. All these and other papers, which are very fully illustrated-for the most part by photomicrographs-are reproduced i n ertenso, together with a record of the discussions which took place when they were presented and written communications upon them that have been subsequently made. As the March Meeting was also the Annual General Meeting it is appropriate that in the present volume there should appear the Report of Council on the work of the Institute for the past year, the report showing that the work of the Institute has been fully maintained.
Metallurgical Pbstracts (General and Non-ferrous). Volume I (New Series) 1934. 780 pp, Cloth. Edited by G. Shaw Scott., M.Sc., F.C.I.S. London: The Institute of Metals, 36 Victoria Street, Westminster, S.W.l.
Subscription price:
$4, inclusive of two “Proceedings” volumes. Metallurgical Abstracts, published under this title since January 1931 and issued atl a supplement to The Monthly Journal of the Institute of Metals, has appeared hitherto 8 s part of the Journal series. The present issue of Metallurgical Abstracts
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is the first volume of a new series;it appears in a distinctive bindingandis complete with its own index containing many thousands of entries. The extent of the publication can be gauged from the fact that the abstracts are gleaned from over one thousand of the world’s scientific and technical publications by a staff of fifty-eight abstractors and reviewers whose names form an impressive list on the opening page of the new volume. The subjects dealt with are grouped under twenty-four main headings and range from “Properties of Metals” to “Industrial Uses and Applications.” I t is difficult to overrate the value of these abstracts to the busy man who desires to keep in close and regular touch with important technical developments in various parts of the world. Gmelins Handbuch der anorganischen Chemie. 8 Auflage. Herausgegeben von der Deutschen Chemischen Gesellschaft. System Nummer 4 : Stickstoff. Lieferung 2. 26 x 18 em.; pp. x 283-506. Berlin: Verlag Chemie, 1935. Price: (abroad) 26.25 marks. The second issue of the volume on nitrogen deals entirely with its compounds with hydrogen and the greater part is devoted to ammonia, including its manufacture. The discussion of synthetic ammonia includes the Haber, Claude, Casale, Fauser, and other processes. The text has been submitted in some cases to the technical interests, who are not likely to have disclosed much of value. The physical and chemical properties of ammonia are very fully dealt with and there are numerous tables and diagrams in the text. The literature references are brought to May, 1935, and in the section dealing with the manufacture of ammonia are less satisfactory than usual, reference to English publications being surprisingly incomplete. J. R. PARTINGTON.
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Eisen- und Stahllegierunyen. Patentsammlung. 1 Eryanzunysheft. By A. G R ~ ~ T Z N E R . Zugleich Anhang zur Metallurgie des Eisens in Gmelins Handbuch der anorganischen Chemie. 8 Auflage. Herausgegeben van der Deutschen Chemischen Gesellschaft. 26 x 18 em.; 425 pp. Berlin: Verlag Chemie, 1935. Price: unbound, 44 marks; bound, 48 marks. This volume is a supplement to that published by the same author and in the same series in 1932, and forms a n independent supplement to Gmelin’s Handbuch. I t includes patents in Austria, England, France, Germany, Switzerland and the United States of America for the period from March 1932 to the end of 1934. It gives in three columns the composition, the properties and applications, and the patent references. The alloys are classified according to composition. Although the first part included patents from 1880 to 1932, i t was a hundred pages smaller than this supplement, so that some idea may be gained of progress in recent years in this field of metallurgy. The work is likely t o prove very useful in technical libraries. J. R. PARTIKGTON.
