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JOURNAL O F CHEMICAL EDUCATION
umes, as temperature conrept, methods for measuring temperature, precision requirements, and conditions affecting temperature measurement. The next eight chrtpters deal directly with the messurement of temperatures in solids using thermocouples. All aspects of thermocouple technique are discussed explicitly, as thermocouple preparation, circuits, instruments, design calculation techniques, installation, drilling holes for mounting, special protective materials, cemented installations and temperature gradient designs. Basic theory is given wherever necessary and this is followed by practical and precise instructions for accomplishing the desired measuremenb. Ample illustrations are used to show the technique to be used, whether it be forming the thermocouple junction, or removing a broken drill from a hole. Ample references are given so that the reader can seek either more theory or articles describing qecifie applications of the technique desoribed. All chemists and chemical engineers concerned with temperature measurement should consult this hook to check the method they are using qainst the variety of methods desoribed. New techniques and "tricks" will be found here that will make this book worth while. KENNETH A. KOBE UNXVERBLTI OW TEXAS AnmnT. Tsx*s
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INTRODUCTION TO ANALYSIS
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CLAY MINERALOGY
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SEMIMICRO QUALITATIVE
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$3.50. THIS book is intended primarily far a one-semester course in qualitative analysis for students with only a onesemester course in general chemistry. It seems that this book would also be a n ideal laboratory manual for the third quarter of a comprehensive course in general chemistry to supplement a. textbook which digcusses the cations in the latter part of the hook. The second edition of this book is now out and it has beeuextensivelyrevised. The formulas of the amphoteric Group I11 ions have been changed to make them more consistent with what is known about the coordination numbers of these elements. For example, the aluminate ion is written A1(OHIr- instead of AM-'. The enlargement of chap& 11, and especidly the short section on the periodic table, are welcome additions to the book, since students with only a part of a year of general chemistry are often deficient in inorganic chemistry, especially of the metallic elements. Other improvements include provisions for the use of thioacetamide an an alternate source of sulfide ion and the separation of copper and cadmium with NazS?OI. The recently approved name for Na,S,O, - - is.. however, sodium dithionite and not sodium hyposulfite. Cobalt is identified by formation of the blue Ca(CNS),-ion, and zinc is confirmed by precipitation as the ferrooyanide. Many other minor changes have been made, improving the book and making it more teachable RAY WOODHIFF
PHOTOCONDUCTIVITYIN THE ELEMENTS
Trevor Simpson Moss. Academic Press, Inc., New York, 1952. x 263 pp. 56 figs. I7 tables. 15 X 22 cm. $7.
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A. B. F. DUNCAN
Ralph E. Grim, Research Professor of Geology, University of Illinois. McGraw-Hill Book Co., Ino., New York, 1953. xii 384 pp. 121 figs. 46 tables. 16 X 24 cm. $9.
C. H. Sorum, Professor of Chemistry, University of Wisconsin, Madieon, Wisconsin. Second edition. Prentice-Hall, he., New 198 pp. 6 figs. 3 tables. 14.5 X 21.5 cm. York, 1953. ix
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general theory of energy levels in solids in relation to optical and electrical properties of conductors, scmieonductors, and insulators is discussed in a rather condensed form in Part I. This part includes mathematical deductions of equ%tiousnecessary for the quantitative treatment of the subject, and gives some general a p plications of the theories. Most of the detailed applications are treated in Part I1 ("Erperimentd methods and results"), which constitutes the major part of the hook. Detailed results me presented for twelve elements (each in a separate chapter) which show photoconductivity. There is s, final chapter in which the results are summarized in tables and generalizations rtre drawn. An author and a subject index are included. This book is recommended as a concise account of modwn theoretied and experimental results relating to electrical and optical properties of solids
THISvolume, written by one of the pioneers in the field of clay mineralogy, is, as far as this reviewer knows, the first comprehensive text on clays published since the early 'thirties. Considering the rapid development in the mineralogy of clays during the last twenty years, the elem presentation of the subjects, and the critical discussion of the voluminous literature, Dr. Grim's monograph will certainly be greeted with enthusiasm by both teachers and research workers. Summaries covering parts of the field in question have fairly recently been published, e. g., the monograph of the Mineralogical Society of Great Britain on X-ray identification and structure of the clay minerals (1951). The present text, however, covers a wider range, including structure, composition, properties, occurrence, mode of origin, distribution in space and time, stability conditions, eta., of clay minerals. The historical development of related concepts has been treated in detail, and the divergence in present opinions as well as the remaining uncertainty on many points is clearly indicated. I t is of course very difficult to obtain complete freedom from formal errors, especially in a work of such a eize as this one. One of the more disturbing ones is the consistent misspelling of Kuonen's name (page 350). In the chapter on nomenclature of rlav minerals the reader is told that the name vermiculite is
great scientific and technical importance
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QUALITATIVE ANALYSIS AND ANALYTICAL CHEMICAL SEPARATIONS
Philip W. West, Professor of Chemistry, Maun'ce M. Vick, Associate Professor of Chemistry, and Arthur L. LeRosen, Late Associate Professor of Chemistry, Louisiana State University. The Maemillan Co., New York. 1953. xii 223 pp. 12 figs. 14.5 X 21.5Em. $3.75.
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T H Ih ~m k prewnts n novcl srhcrnr of systemntir cation amlg&iswhich nvuida tltc uac of wlfidrs, xnd group3 thr d~nltlrrtsquitr. Jillwcrrtlg from the trndirion:ll irhemr. While h y d r d h r i v acid is used to separate silver and mercurous ibns, a concentration
