THE Alloys of Iron Monographs, arranged by the Engineering Foundation of the United States, constitute a valuable series. The alloys of iron and chromium have taken up two volumes; volume 1, by Kinzel and Crafts, dealt with those alloys containing less than 10 per cent of chromium, and now volume 2, by Kinzel and Franks, deals with those alloys containing more than 10 per cent of chromium. The volumes are claimed to be a review and summary of published information and available unpublished data. A careful study of both volumes shows that the work has been well done, and a service of the first order rendered to ferrous metallurgy. The scientific and technical literature covering this field is so extensive now that for those who have not grown up with the subject the systematic study and analysis of available data which the authors have achieved is most valuable. The Alloys of Iron and Chromium Vol. 2: High-Chromium Alloys. By A. B. Kinzel and Russell Franks. (Alloys of Iron Research: Monograph Series.) Pp. xv + 559. (New York and London: McGraw-Hill Book Co., Inc., 1940.) 40s.