Vor. 3. No. 11
RECENT
The baok is excellent for college students in organic preparations and should also be of S e ~ c eto graduate students. The compounds chosen cover a wide range of classes and of methods. The directions are accurate and clear and represent modern methods.
E. EDIKET Rm Physics. M. H. KESSLER,B.S. Globe Book Company, New Ymk. 1921. v 103 xvii pp., 83 figures, 15 X 22.5 cm. $0.67.
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The author bas compiled a manual to be used in preparation for examinations. Seven points have been emphasized: First, laws, principles, and definitions; second, typical problems; third, important diagrams; fourth, college examination questions; fifth, outlines of important experiments; sixth, an appendix containing important formulas with more college questions and answers; seventh, metric equivalents and important physical constants. The baok is prepared for "two distinct purposes." First. "as a companion book to a standard text." second, "as a review before examinations." There are eighteen chapters in the outline: Introduction; molecular motion; mechanics of liquids; mechanics of gases; motion and acceleration; force and equilibrium; gravitation and gravity-pendulum; work and energy; machines; heat; sound; light; magnetism; static electricity; current electricity; Ohm's law and its applications; effectof electric current; induced currents and their applications. Each topic in the Review is in bold type, followed by a brief explanation. A series of related problems are added a t the end of each chapter. Each type of problem is dearly explained and a t least one example of each type is solved in detail. Answers to all numerical problems appear in the back of the book. The text fulfils satisfactorily the two purposes for which it is written. It is a type of hook which should be in great demand by tutoring schools and in college
preparatory murses. It is in no measure a text-book. LESLIE0. JOHNSON Globe Laboratory Sheets. WILLARDB. NELSON. Globe Book Company, New 44 pp.. reference York, 1926. vi tables, 10figures. 19 X 26.5 cm. $0.67.
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Mr. Nelson has combined a set of laboratory report sheets in a bound manual. It is prefaced by a title page to be fded in by the pupil and a certificate to be completed by the instructor. The student is given a short set of concise directions on the use of the book. Excellent sample diagrams for each laboratory science fallow the preface. The actual working sheets are preceded by two pages for indexing 40 experiments. The book is arranged so that two pages are available for each enperiment. Lines are rnled as an aid to neatness. The lefthand page contains four topics in addition to the heading: Object of Experiment; Apparatus and Materials; Procedure; Ohservations. The last two items are arranged so that the observations may he made opposite the points in the procedure. The top third of the right-hand page is blank for diagrams. the middle third is for computations, and the lower third is lined for conclusions and observations. A series of tables is given including formulas; conversion tables; physical constants; chemical elements with their symbols, valences, and atomic weights; and a solubility table. Four pages of graph paper complete the manual. The book is valuable for teachers who demand a "form" repart. The paper is of fair quality, taking the ink easily. LESLIE0. JOHNSON Chemistry in the World's Work. HARRISON E. Horn. D. Van Nostrand Co.. New York, 1926. vii 244 pp. 14.5 X 21 cm. $3.00, net.
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As stated in the preface, "the object of this work is to emphasize in language easily understood by those not technically trained, the part which chemistry has
The 6rst edition of Professor Bancmft's played in assisting in the attainment of our present level of civilization." It is useful hook appeared in 1921 and promptly the opinion of the reviewer that the author made a place for itself. The new edition has admirably succeeded not only in is still better although there are no radical showing how chemistry has developed so changes in treatment. The original 345 that it touches every phase of our life pages have increased to 489 of the same but also in telling the story in non- kind. It must be admitted that this is not a technical language and in a very interesting msnner. The book is divided into text for beginners but rather a stimulating sixteen chapters headed as follows: Soli- reference hook for people who already tude; Mental Isolation; AUies of the Sun; know a good deal of colloid chemistry. Food and Famine; Contributions of The author is gifted in his ability to quote Chemistry to Cloth and Clothing; Deco- the vital statements from research papers ration-Escape from Monotony; Metals, and to offer keen comments on the same. The chemist who is looking for a rethe Master; Materials of Canstruction; Permanency of Possessions; Health and search problem or for additional light on Sanitation; Power; Abolition of Drudgery; a problem finds this hook a gold mine. Chemistry in National Defence; Chem- One may not agree with all the sparkling istly, a Tool; Analysis and Synthesis; The ideas tossed off so easily by Professor Trend and Purpose of Modern Research. Bancroft but an hour with the hook is In the first three chapters the reader is certain to stimulate the flow of one's own told bow isolation, both mental and physi- ideas. We need such books. The author himself regrets that his cal, has been banished and of the part chemistry has had in its accomplishment. chapter on Nan-aqueous Colloidal SoluChapters four to thirteen, inclusive, show tions is so short. There has been t w how chemistry has touched the various little resemch in that field. The treatphases of our lives to give us the security ment of the Electrical Properties of Coland leisure we now possess, while the last loids has been considerably expanded and three chapters give an indication of how there is more about Stability and other topics. the chemist works. On page 18 a. reference to Williams' While the evident aim of the book has not been to discuss the chemistry of the paper, J. Soc. Ckem. Id., 43,97T (1924), difIerent procMses hut to show the Part would have been helpful. Williams played by chemistry, the descriptions, studied the separation of vapors by silica however, are dear and give a good general gel. On page 18 again it might he stated idea of the chemistry involved. Many that Holmes and Anderson removed iron subjects are touched upon and many de- oxide after 6rst drying the iron oxidescriptions are included though very little silica gel to a more or less rigid condition. detail is given concerning methods. A This precaution prevents wllapse of considerable number of full-page illustxa- capillary walls. On pages 18 and 45 tions showing modern chemical processes Reyerson's clever method of metallizing silica gels might be mentioned. J. Am. is interspersed through the text. Chem. Soc., 47,610 (1925). On page 196 GEO.W. SEARS "aluminumUm' should he "alundum." The discussion, an page 164,of Penin's colloid Applied Colloid Chemistry. WILDERD. atmosphere is admirably sane. BANCROFT. McGraw-Hill Company, In short this is a book that every wlloid New York, 1926. Second edition. ix chemist must have. 489 pages. 13 figures. 14 X 19 HARRYN. H o ~ m s cm. $4.00.
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