JOURNKL OF CHEMICAL EDUCATION This reviewer feels that readen should utiliee Professor Timmermans' compilation on hydrocarbons more as a reference work than as a selection of best data, because data on hydrocarbons are given in a more complete and up-to-date manner in the tables of "S~lectedValues of Properties of Hydrocarbons," whieh are issued currently by the American Petroleum Institute Research Project 44 at the Carnegie Institute of Technology, Pittsburgh, Pennsylvania. I n this work t h i ~latter project has had the benefit of prompt first-hand contact with the new data obtained by the Am~ricanPetroleum Institute Research Project 6 on hydrocarbons of high purity, as well as the many new data obtained by the American Petroleum Institute Research Projects 42, 45, and 48. For the many nonbydroearhon organic compounds covered, readers will find this volume extremely helpful as a, guide to the better data reported in tho literature. I t is to be hoped that with this volume as a stepping stone, the data on the nonhydrocarbon organic compounds may some day approach in quality and quantity the corresponding data. now available on hydro-
In addition to the direct by-products, information is presented on beverages from by-products, such as various types of buttermilk, condensation products from whey, condensed products, dried products, cheese and cheese products, various bakery products, various miscellaneous foods such its frozen desserts, confections, meat and egg substitutes, and others. Various canned products are discussed and methods of mmufacture are given. Each of the eleven chapters has been written by either one or the other of the two authors, except the one on bakery products, and here one of the authors has collaborated with L. V. Rogers as senior author. EARL W. FLOSDORF
F. S. SrosEs M ~ c a r r ECOMPANY P a r ~ m s ~ PENNSYLVANIA ~~r*
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PHYSICAL ASPECTS OF ORGANIC CHEMISTRY
William A. Waters, University Lecturer and Demonstrator in Organic Chemistry. Odord University. Fourth edition. D. Van Nostrand Co., Inc., New York, 1950. xii 539 pp. 26 figs. 42 tables. 14 X 22 cm. $8.
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FREDERICK D. ROSSINI ~ Tncnaomar C n m ~ o mI w e ~ r r o rOF PITTBBUAGA. PENNBYlrYANIA
COLLOID SCIENCE
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James W. McBain, Diredor, National Chemical Laboratories, Poona, India. D. C. Heath and Co., Boston, 19%. 450 pp. 185 figs. 23 tables. 16 X 24 om. $6. TAIS well-known authority in the field of colloid science has prepared a book of 27 chapters which will be found most useful to physicists, chemists, and biologists who desire a well-rounded introduction to the subject of colloid science. The author is congratulated upon the service whieh he has rendered and the publishers are complimented for the beautiful manufacturing job. ARTHUR N. THOMAS COLUMB~ UAN W E ~ S I T Y NEW YORI,New Yonr
BYPRODUCTS FROM MILK
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Earle 0. Whittier and Byron H. Webb, Bureau of Dairy In. dustry, Agricultural Research Administration, U. S. Department ol Agriculture. Reinhold Publishing Corp., New York, 1950. viii 3l7pp. 2 3 figs. 40 tables. 16 X 24 em. $6.
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TEE stated purpose of the book is to bring together in one volume the various methods of utilizing by-products previously available in Federal and State bulletins, patents, and technical iournals. Promisine nrocedures. not vet commerciel. have been
well as to plant managem and engineers. The physical and chemical characteristics of milk, skim milk, whey, and buttermilk and their components are presented. Methods of converting these into foods as well as using in foods are given. Also, non-food products are included. Directions for manufacturing many of these are given with formulas and procedures. Different types of processing and equipment used are described along with analysis and testing. Theoretical discussions are included only to the extent necessary for the understanding of the principles on which the manufacturing procedures are based. At the end of each chapter, there are references, not all-inclusive, but selected for furnishing the mmt mactical and admuate information on the orinciples and procedures presented. -
UNLIKE B few "revised editions" being perpetrated upon the chemical buying public with no revision and little re-editing, the fourth edition (third for Van Nostrand) of Waters' popular text is in truth rewritten in large part. The organization of the book is essentially the same as the 1936 edition, having been changed by reversing the order of ohaptms in two czses, by new titles for some chapters, and by rearranging the order of presentation within several chapters. The most thoroughly rewritten chapters in which the bulk of new topics appear are the two on free radicals (in which Waters' own work is substantial), substitution reactions of organic halogen compounds (revised in terms of current theory of the English school of organic chemists), ester hydrolysis and esterification (rewritten in modern language), and the study of moleoular structure (almost entirely new since the &-st edition). References to the literature after 1940 are frequent in these chapters and scarce in the remainder of the hwk. Many improvements in clarity or simplification have been made, for example, by critical selection of terminology: the selfdescriptive words homolytic and heterolytio h m replaced what were in the 1936 edition called (misleadingly, I thought) nonionic and ionic reactions, respectively; the words basylous and acylous, never popular in this country, have been dropped; and tho word prototropy substituted for desmotropy. Waters has not abandoned the idea. of a localized oair of electroni in H c h ~ n i cbond ~ l Lut hr h ~ iin. n qualirotivr w1y piled t l w COnCQptr fro~urcsonuncc rlwor? and e3w ~ w r h r ~ r won . tup uf tht. oldrr rla.ory. T h e rwult i+ n c,,net:rvxri\.v pwlnn, in n o w mathematical terms presented in very clear exposition. LEALLYN R. CLAPP BROWNUNIVERSITY PROYIDBNCB, RHODBISLAIID
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THE BIOCHEMISTRY OF THE NUCLEIC ACIDS
I. N. Davidsob, Gardiner Professor of Physiological Chemistry, University of Glasgow. John Wiley and Sons, Inc., New York, 1950. ix 163 pp. 15 figs. 4 plates. 11 X 17 em. $1.75,
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IN VIEW of the interest that has developed during the Isst decade in nucl@onroteinsand their constituent nucleic acids. this well-written srtd readable summary of our knowledge of the chemistry and physiology of the nucleic acids is welcome. The broad approach to the subject is indicated by the titles to the fifteen chapters of the book. There artre chapters an the hydrolysis products of nucleic acids; the structure and properties of oo~vnucleotidesand nuoleoproteins; nucleic acid content of tissue: nuoleams and related ensymis; nucleic acids in cell
