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Symposium on pH Measurement. 104
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pages. American Society for Testing Materials, 1916 Race St., Philadel phia 3, Pa., 1957. $2.50. To keep pace with advances in pH instrumentation and technology, ASTM held its second symposium on the sub ject. Proceedings published in this volume include such topics as : Meaning and Standardization of pH Measure ments, R. G. Bates; Performance Studies of Reference Electrodes and Their Components at High Tempera tures and Pressures, J. E. Leonard; Modern Developments in pH Instru mentation, W. R. Clark and G. A. Perley; Problems in Measurement of pH of Blood and Other Biological Fluids, Julius Sendroy, Jr.; Quantita tive Applications of pH Measurements in Analytical Chemistry, Henry Freiser; Theoretical and Practical Problems in the Measurement of Acidity in Non aqueous Media, Martin Kilpatrick; and Indicator Acidity Functions for Nonaqueous and Mixed Solvents, M. A. Paul and F. A. Long.
1 4 3 9 FOURTH STREET ( S i n c e 1 9 0 9 ) BERKELEY 1 0 , C A L I F O R N I A
For further information, circle numbers 50A-1, 50 A-2 on Readers' Service Card, page 99 A
Bausch & Lomb Speclronic 20 Colorim eter Industrial Methods Manual. Aluminum Alloys Section. 25 pages. Bausch & Lomb Optical Co., 635 St. Paul St., Rochester, Ν . Υ . 1957. $5.00.
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A set of industrial methods for the colorimetric analysis of various metals in aluminum alloys is contained in this ring binder manual. Methods are spe cifically adaptable to the Bausch & Lomb Spectronic 20 colorimeter. Procedures are given for manganese by the persulfate method, copper by diethyldithiocarbamate, nickel by dimethylglyoxime, chromium by the chromate method, and iron by o-phenanthroline.
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Microphotography. G. W. W. Stevens. xvi + 326 pages. John Wiley & Sons, Inc., 440 Fourth Ave., NewYork 16, Ν. Υ. 1957. $8.50. The potentialities of the highly specialized field of microphotography have not been heretofore recognized in a unified text, according to the author. Accordingly, he has attempted to fill the need for such a text with this de scription of the principles underlying sound microphotographie practice. The 13-chapter book, with 84 illustra tions, nine tables, and extensive refer ences, is essentially an introductory
