i t as complete and accurate as possible. Furthermore, it is practically a pioneer treatise in the field. One cannot glance through it without being amazed a t the progress made in this branch of analysis. Volume I is divided into six parts. Part I deals with general principles, apparatus, errors, directions for using colorimeters, etc. Part I1 covers inorganic analyses. Forty-two elements, radicals, and compounds are discussed in detail. part I11 covers organic analyses. Here one finds described the analyses of seventeen or more compounds by colorimetric methods. Part IV covers the big sub: jects of blood and urine analysis. Part V is a very comprehensive bibliography. Part VI contains several useful tables and both subject and author indices. Very full working directions, precautions to be observed, errors of the method, precision of the method where known, etc., are included in the discussion of each analysis. The book contains also a foreword by Philip Adolph Kober, well known for his work in photometric analysis and for the instruments bearing his name. The reviewer wisheSto congratulate Dr. Yoe on his splendid effort. +He has performed a service, not only labor-saving but decidedly inspirational, for all cbpmists. No one working along the lines mentioned can afford to he without this book. MALCOLM M. HARING
Physical and Chemical Constants and Some Mathematical Functions. G. W. C. KAY@ AND T. H. LABY. Sixth edition. Longmans, Green and Co. Ltd., London and New York, 1928. 163 pp. 16.5 X 24.5 cm. $4.75. This well-known publication needs no introduction t o the chemical public. I t is an exceedinglply compact and well-chosen set of t3bles for uic right in the lnboratnry. Physical rlwmistr crpeciallg find it r e v helpful. In this edition, any persistent errors have been suppressed as far as they have been observed. the tables ha* been brought fairly well up to date, and a new table on "Thermal Conductivities of Gases" has been added. The reviewer would suggest including in the seventh edition a full-fledged five-place logarithm table, instead of the very brief .. table of five-figure logarithms found .
