number as the excess of protons over electrons in the nucleus derivatives. These changes in the order certainly produce a (29, 72), the explanation of hydrolysis (150). The formula for mare logical sequence of topics which will undoubtedly appeal strongly to teachers of the science. On the other hand some bleaching powder appears to be ~C~(OCI)C~.C~(OH)Z.~H~O, not simply Ca(OC1)Cl (166). Turnbull's Blue (380) has the same students may find it rather tedious to hegin by mastering 64 pages chemical composition as Prussian Blue. Pentavalent arsenic cat- of theory, some of it rather abstract, before encountering the &st ions (237) probably do not exist. The term "acid salt" (201) is descriptive chapter on oxygen. The grouping of all phases of organic chemistry in succeeding chapters is an undoubted advantanomalous according to the new acid-base theory. The book is too short for a one-year college course. For ex- age. In spite of these attempts to gmup some of the subject matter ample, only two pages are devoted to the chemistry of chromium and most other subjects are treated correspondingly briefly. into a logical sequence, the book adheres to the traditional Smith Its use will require much supplementary material but it will method of "progressive repetition" for the more extended topics provide a very good outline. On the whole, however, the author such as ionization which is touched upon or treated in detail in is to be congratulated for having taken a distinctive step in the no less than 14 different chapters. The classical theory of Arright direction. E. A. WILDMAN rhenius is used in treating the question of weak electrolytes. In a separate chapter, to avoid confusion, greater emphasis is placed EAaLHnx C o ~ w c e upon the theory of complete ionization. In the previous edition a Rlcnuono, INDIAN* single chapter was devoted to Radium, Atomic Energy and Ams TO THE ANALYSIS OP FOODAND DRUGS. C. G. MOOT, M.A.. Atomic Structure; in the third edition this material has been expanded into three chapters. This expansion has become F.I.C., Public Analyst for the County of Dorset, and William Partridge, F.I.C., lately Joint Public Analyst for the County necessary by reason of the interesting discoveries which have been of Dorset. Fifth edition. Revised and partly rewritten by made in the borderland of physics and chemistry. The new topics ,~~ ~.. John Ralph Nicholls. BSc., F.I.C., Chemist a t the Government discussed in this field include oositrons. neutrons., the oackinr Laboratory. London. William Wood & Company, Balti- fraction, isotopes of oiygrn and hydrogen, hrdvy watcr, artifictsl rrsnrmutations hy atomic bombardment, srrni-pular or romore, 1934. viii 322 pp. 16 X 10 cm. $1.50. ordinate valence, the atom and wave mechanics and ortha- and The first edition of this comprehensive little volume appeared para-hydrogen. in 1895. During forty years its subsequent editions have served I n addition to these major additions there are "innumerable as a trustworthy guide to food and drug analysts of the British minor alterations" used to "bring the text into agreement with Empire and elsewhere. current theory or practice." The plan of treatment of the subject mdtter follows this There are 53 chapters in the present book, spaced as the author general order: First, a discussion of the composition, sources, and believes so that "each of the chapters.. .constitutes a practiccommercial varieties of the f w d or drug product. Second, a able (and not tw strenuous) lecture assignment." One chapter statement of the commonly oceming adulterations. Third, is devoted to a "Practical Review of the Non-metallic Elements" methods of analysis for the active ingredients and methods for and another to a "Practical Review of the Metallic Elements." the detection of the common adulterants. For a discussion of theory and the presentation of the nonThe work embraces dairy products, cereals and starches. metallic elements including silicon and boron 450 pages are used. beverages and condiments, food preservatives and coloring mat- Carbon and its compounds fill 86 pages while the presentation t e n , drugs and medicines, and commercial disinfectants. The of the metallic elements occupies 188 pages. The exercises a t appendix includes some legal information very useful to the the close of the chapters are not all in the nature of mathematical analyst, a table of atomic weights, and methods of calibrating problems, but are stimulating and suggestive. The book as a volumetric apparatus. A complete index accompanies the whole will prove to he somewhat mare difficult than the previous volume. editions, and it is quite certain t h a t t h e author expects the stuThe style of the authors is clear and concise; ideal for the pur- dents of his book to have had some previous introduction t o pose, setting forth in an unmistakable manner the many aria- "hemi.+", lvtical orocedures included. Thc appendix contains six tables of useful information The Thc work admirably fulfils the purpose of the authors, namely, index i, complete and w l l arranged. although it docs not contain to present in a concise and compact form the information needed such terms as "buRerWand "pH" which some renders might . exdaily by the analyst in laboratories of food-and drug control. pect in a text of like proportions. Another new feature is the inclusion a t the' end of many of the chapters of a limited number of references for additional reading. These references have not been chosen for the purpose of providing "more meat, but in the form of appetizers.'' They are SMITE'S COLLEGECEEMISTRY.J a m s Kcndall, Professor of Chemistry, University of Edinburgh, formerly a t Columbia mostly articles in semi-popular style taken from the "fertile EDUCATION, and less freUniversity and a t New York University. Third Revised pages" of the JOURNAL OP CHEMICAL Edition. D. Appleton-Century Co., New York City, 1935. quently from the Alembic Club Reprintsas well as the author's own xiv 753 pp. 18 halftones. 183 figs. 14 X 21.5 cm. popular book A t Home Among thc Atoms. These references should be popular with the teachers and with those students $3.75. who really want to know the modern science of chemistry. The third edition of this well-known textbook will be welcomed The half-tones are nearly all new and well selected for their by those teachers who are looking for a thoroughly modern and interest and educational value. The former plan of giving scientific presentation of the chemistry of today. It is a worthy rather extended captions in the form of human interest stories member of the excellent group of the Smith series of textbooks for these illustrations is continued. Many of the old figures in the which have been so long and so favorably known. previous edition are retained, but they have all been made more The new book contains considerably more material than its useful by a brief descriptive caption under each drawing. The predecessors. The page is larger; there are fewer blank spaces paper and binding will give good service and the print is well and the number of pages is greater. The order of presentation is selected for ease of reading. quite similar to that used in the preceding edition. The two The third revised edition of Smith's College Chemistry is an most notable changes in the order of chapters are as follows: excellent product and worthy of sustaining the high regard won (1) the chapters on Combining Proportions by Weight; Atomic by its predecessors. Professor Kendall is to be congratulated Theory, Atomic Weights and Crystal Structure; and Symbols. upon his marked success in reaching the high ideals which Formulae and Equations are placed very early, just before have actuated him in bringing this standard text up to date. oxygen. (2) The chapters on Plant Life: Plant Growth; Plant B. S. H o ~ g ~ s Products; Animal Life; and Synthetic Organic Products follow U N I V B ~ ~om I TILL~NOIS Y immediately after the discussion of the hydrocarbons and their UPB."., ILL~N~IS ~
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