over from previous editions in lieu of the more acceptable spelling "yne." The third division of the hook, in particular, will appeal t o sludents of chemistry. The book represents, in the opinion of the reviewer, an improvement over the previous edition which is in keeping with the progress of the science involved. ED. F. DEGERINO PUSDUB UNWBPS~TY LlFruarra,
INDIAN*
A TEXTBOOK 011 QUALITATIVE CHEMICAL ANALYSIS.Arthur I. ragel. D.Sc. (Lond.), D.I.C., F.I.C.. Head of Chemistry Department, Woolwich Polytechnic: lately Beit Scientific Research Fellow of the Imperial College. Longmans, Green and Co., London, New York, Toronto, 1937. xi 383 pp. 14 figs. 14 X 22 cm. $3.00.
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This volume was written to provide a textbook a t moderate cost which could be used by the student in English schools throughout the whole study of the subject, from Schwl Certificate to Final Bachelor of Science Examinations of the Universities, as well as for independent laboratory guidance. The material of the hook is organized as follows: Chapter I . Theoretical Basis of Qualitative Analysis, ninetyeight pages. Chapter 11. Analytical Operations, fourteen pages. Chapter 111. Reactions of the Metal Ions (includina .tables for analysis of the analytical groups), seventy-four pages. Chapter IV. Reactions of the Acid Radicals (with special procedures suggested for common interferences in the tests for acid radicals), seventy-five pages. Chapter V. Systematic Qualitative Analysis of Inorganic Substances, fifty-seven pages. Chapter VI. Modification of the Systematic Analysis when Organic Acids, Silicates, Borates, Fluorides, and Phosphates are present, thirteen pages. Chapter VII. Reactions of Some of the Rarer Elements, nineteen pages. Appendix. Atomic Weights, Preparation of Reagents and of Test Solutions, Detailed Suggestions on the Course of Instruction, and Table of Logarithms, twenty-four pages. The discussion of ionization, chemical equilibrium, balancing equations, and oxidation potential, with the usual sub-topics, is reasonably complete, combining the classic and modern points of view. I n the sections covering reactions of metals the usual inorganic reactions are supplemented by inclusion of the more important organic reagents. A fairly large number of acid radicals are covered in Chapter IV, including, for example. cyanide, cyanate, thiocyanate, ferrocyanide, ferricyanide, and the following organic acids: formic, acetic, oxalic, tartaric, citric. salicylic, benzoic, and succinic. I n the section on systematic qualitative analysis, considerable stress is laid on preliminary tests by both dry and wet methods before attempting the usual dissolving of solids and analysis of the solutions. The analytical procedures are described with distinctly less detail than we are accustomed t o in the United States. This may well be due t o the difference in method of teaching the subject in England and in this country. Apparently in England there is less of formal class work than here, the student being thrown on his own in the laboratory after a few introductory lectures. To prevent the laboratory work from becoming a mere routine following of directions, the procedures are purposely left more or less in outline form, thus requiring individual initiative in devis. ing the proper conditions far carrying out particular operations. The book seems fairly free of errors though one may note an uncertainty as t o the reaction of ShlSs with HCI. On page 140 the equation is given correctly showing the formation of ShCls,S, and H a ; on page 145 the main product is given as "SbCII (or ShCla)". and on oaae 290 the ~ r o d u c t sare given as "SbClr (and/ or H ~ [ S ~ C)". I ~- ]Also, on pa& 146, the lasiequationshowing the formation of Fe(NO& and NnO by the reaction of HN03 on Fe is not in accord with the statement in the previous paragraph
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that a ferric salt is produced. Further, if As& is bailed for ten minutes with 10 cc. of concentrated HCI, as recommended on page 145 in the analysis of the arsenic group, an appreciable amount of As2Sawill dissolve. The author's practice of enclosing certainof thecomplex radicals in brackets-K [Ag(CN)nl, page 34--of setting off the organic acid radicals from the replaceable hydrogen or metallic radical by a dot-HGHsO*, page lfr-and of enclosing the ammonium radical in parentheses in certain c o m p o u n d ~ M g ( N H ~ ) P O ~ . page Zsrepresents an individual point of view which is not always adhered t o in all parts of the book. The selection of simpler topics for an introductory course is well done, while ample material is left to make a later course much more than a re~etitionof the earlier one. On the whole the author seems to have accomplished his purpose of writing a book that shall serve thestudent effectivelyover a period of years.
LEHRBUCH DER CHEMIE. Zweiter Teil. Organische Chemie. (Textbook of Chemistry. Part 11, Organic Chemistry.) Walter Hiickel, Professor, University and Technical High School. Breslau. Akademische Verlagsgesellschaft m. b. H., Leipsig, Germany, 1937. xvi 602 pp. 32 figs. 23 X 15.5 cm.
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This text, the companion of an earlier one by the same author entitled "Part I , Inorganic Chemistry" is a thorough, interesting treatment of the field of organic chemistry. The book begins with a concise yet adequate discussion of the early development of the science and a brief description of various Laboratory methods. The text was written for students beginning the study of organic chemistry, and is an excellent comprehensive survey of the field of such students. The author possesses the happy faculty of presenting his subject matter in a most interesting manner, and the reader's interest is increased in no small measure by the short biographical sketches which appear as footnotes throughout the book whenever the name of an important personage is mentioned. A few of the references are to notes in Part I, so that for the most efficient use of the book Part I should he available. The number of such references is not large, however, and Part I1 could be used even without Part I. The last chapter (thirty-two pages) dealing with carotinoids, vitamins, and hormones is exceptionally well done and should prove very useful to'medical students. As a further aid t o such students, the sections of particular interest to them are marked in the table of contents with an asterisk. After arather careful reading of the text, we are quiteconvinced that it is one of the best in its field that we have had the oppartunity to examine. The hook is interestingly written, it is authoritative, comprehensive, with no undue emphasis on any particular field, and remarkably free from typographical errors in structural formulas. I n one detail, however, the structural formulas might be improved. No distinction is made in such structural formulas as that of azoxybenzene between the symbol for a coordinate covalence and that of an ordinary covalent double bond. NATHAN L. DRAKE UNZVBRS~TT OP MARYLAND COLLEDB PIRX, M*.YL*ND
PRINCIPLES OP CHEMICAL ENGINEERING.William H. Walker, Warren K . M s , WJZiamH . McAdnms, and Edmin R. Gilliland, Massachusetts Institute of Technology. Third edition. McGraw-Hill Book Co., Inc., New York City and London, 1937. ix 749 pp. 15 X 23 cm. $5.50. The Chemical Engineering "Bible" has appeared in its third edition. Col. William H. Walker, who was originally responsible for this hook has died since the issue of the last edition, but his influence is still apparent in this new edition. The name of a new author, Edwin R. Gilliland, appears on the cover. The present
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