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of material and orderly arrangement, makes the book very readable. The section on natural products is well done, and the reviewer is glad to see at last a text book of organic chemistry in which stereochemistry is treated so well. The printing and binding are splendidly done, and there are very few typographical errors. Altogether a fine piece of writing and Look making. LEE IRVINSMITH.
Gmelins Handbuch. der anorganischen Chemie. 8 Auflage. Herausgegeben von der Deutschen Chemischen Gesellschaft. 25 x 17 cm. (a) System Nummer 8 : Jod, Lieferung 2. xxiii 245-660 pp. Price: 68.50 M (subscription price: 60 M); (b) System Nummer 59: Eisen, Teil A, Lieferung 5. xiv 847-1166 pp. Price: 50 M (subscription price: 43.50 M). Berlin: Verlag Chemie G.m.b.H., 1933. (a) The volume on iodine deals with hydriodic acid, the iodides of nonmetals and metals, polyhalogenides, the oxides and oxyacids of iodine, iodine fluorides, chlorides, and bromides, nitrogen iodides, and an appendix to the first part of the volume on iodine which has already appeared. In all cases the treatment is exhaustive, accurate, and critical, full numerical data, curves, and discussions of physicochemical topics being included. The literature has been very completely covered and very modern work finds its place in the treatment. (b) The volume on iron deals with the physicochemical foundations of the technical production of malleable iron. The systems Fe-0-C, Fe-Si-0, Fe-Mn-0, Fe-P-0, Fe-S-Mn, etc., are considered. Deoxidation with manganese, carbon, silicon, aluminum, titanium and combinations of these is next dealt with. The casting of iron and steel is considered in relation to melting in crucibles, cupolas, reverberatory furnaces, Siemens-Martin furnaces, converters, and electric furnaces, The treatment of ferrous alloys includes those with manganese, chromium, molybdenum, tungsten, nickel, titanium, and vanadium. The treatment throughout is linked with technical processes and abundaqt references to literature are given. The two volumes considered fully maintain the high standard of Gmelin and are unexcelled in completeness and accuracy in their field. They are very valuable contributions to the literature of chemistry. J. R. PARTINQTON.
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