The Thiele theory of partial valences is equipment of the laboratory, and denot mentioned, nor is the C m - B r o w n scription, care, and use of instruments rule t o be found in the index as such. are excellent, and the illustrations well As described in page 475, the student chosen. The descriptions of methods is required t o memorize two lists of radi- of analysis are concise, dear, and devoid cals. The general and equally reliable of unnecessary verbiage. If followed Vorlander modification of Crum-Brawn's rigorously, and with the necessary skill, dependable results will ensue. Certain rule has been also omitted. I n view of the present wide use of the quinhydrone modifications in technic which have met electrode and the Clarke and Lnbs series favor are omitted, but that is a matter of substituted sulfone phthaleins as of author's judgment and user's choice. indicators, the reviewer would like t o The careful inclusion of calculation have seen these substances included in a formulas will be very welcome to those bwk as comprehensive as this one, not sufficiently accustomed t o the arithrather than some of the less important metical manipulation of analytical data. In a book so replete with data and tables, compounds mentioned. The book is well printed on good paper. i t is excusable that some errors should The author and publishers are t o be appear and even statements that the congratulated an the excellence of the author on further consideration would proofreading as the book is remarkably modify. free from typographical errors. From a chemical standpoint, the Despite the faults found the reviewer theoretical chapters do not assume on enioved reading the book and he has no the part of the reader much mastery of . hesitation in recommending it as a fundamental science, without which any teachable text sure t o be of value t o both discussion of physiological and pathologistudents and teachers of organic chem- cal processes must be incomplete. Many istry. of his readers, not thus equipped, will L. C. MACTAVI~K rejoice at this, and will be satisfied with the general theories and facts presented. Where opinions in interpretation differ, the presentation is fair and reference t o Blood and Urine Chemistry. R. B. H. literature generous. Inspiration t o furGRAOWOHL, M.D., Director of the ther reading and deeper study should Gradwohl Laboratories, St. Louis, Mo. result. and I. E. Gradwohl, A.B., Instructor in the Gradwohl School of Laboratory Technic, St. Louis, Mo. C. V. Moshy Company, 3523-25 Pine Blvd., St. Louis. m e A B C of Hydrogen Ion Control. Mo., 1928. 542 pp. 117 illustrations W. A. TAYWR, Ph.D., Chemical Director. The LaMotte Chemical Products and 4 mlor plates. 17 X 25'14 cm. Co., Baltimore, Md. Fifth Edition, $10.00. 1929. 132 pp. 18.5 X 26.5 cm. IllusThe first sentence of the preface, t o trated. Free. the effect that the work is a textboak for ~
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laboratory workers and practitioners of medicine, invites the statement of opinion that a physician with only the usual training in chemistry should not assume the duties and responsibilities of a biological chemist, even with the help of a technician. The chapters on the installation and
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The fifth and enlarged edition of this booklet is in line with the steadily increasing numbers of practical applications of hydragen-ion measurements t o the various types of research and industrial work. The material presented is divided into five main portions: The Meaning of Hydrogen-Ion Concentration, including
