NEW BOOK8
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coatings, the methods of testing coatings, and the quality of coatings produced by various procedures. The book is unusually well written and is remarkably free from error. The book is profusely illustrated with tables, data, curves, and micrographs. Literature references given in the form of footnotes, while not exhaustive, are well chosen and are adequate, so that the reader may inform himself in greater detail on any portion of the subject matter by reading these well-selected references. The reaction of this reviewer is well expressed by a portion of the foreword written by H. 5. Rawdon, which reads as follows: “The investigator of the abstruse problems of corrosion, as well as the materials engineer seeking practical help in combating this problem by preventing corrosion by protecting the surface, will find this volume a veritable mine of information on all phases of the subject.” EDWINM. BAKER.
Gmelins Handbuch der amrganischen Chemie. 8 Auflage. Herausgegeben von der Deutschen Chemischen Gesellschaft. System-Nummer 27: Magnesium. Teil B, Lieferung 4. 26 x 18 om.; pp. 423-549. Ber1in:Verlag Chemie, 1939. Price: 18.75 FLM. This section contains the conclusion of the description of the compounds of magnesium, mostly double salts with salts of alkali metals and including such analytically important substances as magnesium ammonium phosphate. This part contains a large number of phase rule diagrams. The section a t the end deals with the technical preparation of magnesium compounds from various raw materials. The present part completes the B section on magnesium. The abundant numerical data make this a very useful section of the Handbuch. J. R. PARTINOTON. Gmelins Handbuch der anorganischen Chemie. 8 Auflage. Herausgegeben von der Deutschen Chemischen Gesellschaft. System-Nummer 35. Aluminium. Teil A, Lieferung 6. 26 x 18 cm.; pp. 887-1110. Berlin: Verlag Chemie, 1939. Price: 27.75 RM. This section deals with the alloys of aluminum with the metals from manganese to rhenium, inclusive, in the schematic order of Gmelin. The physical and chemical properties of the alloys and their analysis are dealt with, and the information is remarkably complete, the mechanical properties, for example, being fully dealt with. The text is very well illustrated with curves and diagrams, and there are many detailed tables of properties. The section will be of special interest to metallurgists as well as to chemists. J. R. PARTINOTON. Gmelins Handbuch der anorganischm Chemie. 8 Auflage. Herausgegeben von der Deutschen Chemischen Gesellschaft. System-Nummer 68: Platin. Teil B, Lieferung 1. 26 x 18 cm.; pp. 1-72. Berlin: Verlag Chemie, 1939. Price: 8.25 RM. This section deals with the physical properties of platinum under the following headings : nucleus, atom, crystallographic properties, mechanical properties, and thermal properties. Further sections continuing this description will follow. The literature is exhaustively covered, and some valuable pieces of information have been added from private unpublished sources. There is a section on the atomic weight of platinum, and one on the passage of gases through platinum. Since the physical properties of platinum are of importance in many branches of investigation, this section of Gmelin will be of very general interest. J. R. PARTINGTON.
