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moderate price of lo/-; but it is in itself far from being a disadvantage. l I r s . Lonsdale’s beautifully neat manuscript and mathematical formulae are a pleasure to read, and give a personal touch to this work that is lacking in most scientific treatises. R. IT. JAMES. Aluminium-Legierungen Patentsammlung geordnet nach Legierungssystemen. 2 Teil (Zugleich Anhang zu Aluminium Teil A in Gmelins Handbuch der anorganischen . ~ N DG. APEL. S e b s t einem Markenz~erChemie, 8 Auflage). By A. GRL-TZKER zeichnis bekannter Aluminium-Legierungen. By A. VON ZEERLEDER.25 x 17 cm.; 344-868 pp. Berlin: T’erlag Chemie, 1936. Price: 40.50 RlI. The second part of this nork deals nith alloys of aluminum with titanium to zirconium, the first part having dealt with silver to thorium. The arrangement is in three columns, the first giving the composition, the second the properties and uses, and the third the author and literature (patent numbers). The supplement on trade designations gives the name of the alloy, the manufacturer or inventor, and the percentage composition. The preface states that the work is now complete. In view of the increasing importance of aluminum alloys the collection of information in these two volumes cannot fail to be of considerable service. J. R. PARTINGTON.
Das Ausbluhen der Salze. By KARLSCHULTZE, Hygien. Staatsinstitut Hamburg. Sonderausgabe aus den Kolloid-Beiheften Bd. 44. 23.5 x 15.5 cm.; 99 p p , ; 36 fig. Leipzig: T h . Steinkopff, 1936. Price: 4 RlI. Although “ Ausbluhen” is usually translated as “efflorescence” the author interprets this term very liberally and includes in his very interesting book a range of phenomena which normally nould not be classified under this heading. One naturally expects to find an account of the loss of water from salt hydrates and the effects obtained in the evaporation of solutions, e.g., the creeping of salts and the formation of crusts. There are, hon-ever, interesting accounts of the formation of alkalis, ‘nitrates, gypsum and other substances on the surface of soil and desert land, and valuable comments on the causes of bloom of sulfur on vulcanized rubber, patina formation, the rise of sap in plants, and the appearance of efflorescent substances on building materials. Many will also read n i t h advantage the references t o those curious thread-like growths such as hair silver, copper hair, and alumina threads. Careful consideration is given to the theories which have been advanced to explain these various phenomena; the author expresses his preference for the capillary theory, a s it can be usefully applied in very diverse fields. There is much within the scope of this book to interest the chemist, the physicist, and the biologist, including those directly engaged with soil problems. 177. WARDLAW.
P. ~ I A T H E W Andrew Y S , Carnegie Professor of Principles of Biochemistry. By ALBERT Biochemistry, University of Cincinnati. x 512 pp.; 4 fig. Baltimore, Maryland: William Wood and Company, 1936. Price: $4.50. This is not a revision of the well-known Testbook of Physiological Chemistry by the same author, but rather a n entirely new book designed for use in colleges and medical schools where the course offerings preclude the use of the larger and more detailed text. The text is written in a flon-ing and very readable style and there are interspersed between the discussions of facts and scientific findings those thoroughly enjoyable and a p t philosophical comments of the author m-hich characterize most of his publica-
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