, Recent Books A Laboratory Covrre in Chemistry. A Laboratory Course in Chemistry, 2nd edit. written by GOY CLIWTON,EUZAB&I.A I. GAT== AND Wrmua. A. S a n r ~ , Central High School. Washington. D. C. Copyrighted Section I, 1922-24, Section 11, 1923. Preface 1%'PP., introduction I1 pages 139 pp. 35 ilius t t i Size of pages 12% cm. X 20% cm. price not stated. This course, published in two sectionri, is a printed form of mimeognrph copies of lessons used for several years in the Central High School. Washington, D. C. The authors a r e emphasizing the es.enti.4 step "experience" in the experiments, not being content with one illustration of a principle but rather fallowing the McFarland -heme of teaching chemical principles nnd r c n m ~ i n l : by scvcrvl illurlrxriolu of each. Thc usuni a r r . 8 ~of preliminary dirkcrioos xppcar. i t is e h n ~ t e z t dbut ernertmrnf numbaa are consecutive as many as five or six t o n chapter. The is large for an o r d i d i y high-sehool student carrying chemistry only one year. However this allows the principle of selction t o be applied by the individual teacher. Sections I and I1 offer an abridged text of non-metallic ehemistry. Metallic experiments are lacking. Chapter. X and XI11 offer break. from the traditional laboratory manual, being devoted t o problems and study of valences. The authors have appropriated the term "miuocrith" with a slight change of meaning. An index of experiments would aid materially in finding desired experiments as no special order of material appears to have been followed. The authors fail t o use the G. M. V. in problems involving weight and volume. Directions are copious which whhld fend t o divert student's attention from the point of experiment. LB~LIB0. JOHNSON
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Physical Chemistry for Students of Medicine. A~XINOHRFINDLILY. 227pages. Longmans, Green & Co. 1924. As stated by the author in the preface, the treatment in this book "is based on the course of medical phyrieal chemistry pursued by medical students in the University of Aberdeen." I t s general scope is indicated by the statement that "those parts of physical chemistry which have found important applications in the medieal in an elementary manner:' sciences are di-nred Previous books by this author would lead a reader t o expect substantial subject matter in all his works, and the present volume is not an exception, in spite of the fact that he refers to his dioeussion as "elementary." In thoroughness of treatment of the topicsineluded, the bwkcompares well with books with more pretentious tities snd prefaces. The work is unique on account of the subject matter omitted ar well as that included. Such topics as the solvent action of water, surface tension, viocority, osmotic pressure, the ionic theory, chemical equilibrium, catalysis, and the eollaidal state are discueed in a very satisfactory way. On the other hand, the book is notable as a modern textbook on physical chemistry in that no mrnfiun ~ + m a d c osuchruUccrsuoaton~ie l rrrurturc. gol'r and uon-polar nnslcruler, fhcr~uodynomtcs, rsdioacri\its, and so forth Eui. dently, Professor Sindlay considers these later topics impractical-at icaot as far ns medicine is concerned. Use of the calcdvr has been avoided. Only one diEerential expression has been noted by the reviewer, and that occurs in a footnote. On the other hand, the t m t m e n t is by no means mathematiu-free, for the book contains a large number of calculations and ~ m b l e m tso illustrate theorien discussed. The distinctive feature of the work is the abun-
