free from misprints. The following changes are suggested for future editions of the hook. The table of specific gravities and normalities, page i 2 , would be more adaptable to American practice if the data were given for 2 5 T . instead of 15°C. The latest international tablc 01 atomic weights should be used to avoid confusion. I t would he better in several instances if the amounts of substances wed in reactions were stated morc dpfinitely, i. e., the directions "adds little water" or "add an excess" z might he interpreted differently by different analysts. On page \+, line 22, three should read there. The second paragraph on page 46 is a bit ambiguous and would be clearer if not translated quite so literally. L. C. CADS UNLVERSITY Or( I D A ~ O MOSCOW. IDABO
Magnetism and Electricity. Monnrs AME~STDR.New York Training School for Teachers, College of the City of New York, and Editor, The Scieme Clnssronm. Charles Scrihncr's Sons, 210 pp. New I'ork City, 1929. r i v 149 illustrations. 13 X 19 cm. $1.00.
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This hook is the third of a series of four texts, "Living in n World of Science." which endeavors to "humani e the scientific facts, principles, and conceptions of thc world in which we live." I t i.; intended to present some of thc principles of magnetism and electiicity in a form understandable for pupils of the seventh and eighth gradcs. The subject matter is divided into sirteen chapters on "a chapter a week" plan. Each is concluded with a "truefalse," or similar test, "How Much Do I Ilemcmber?" and a list 01 "Things to Think About and Find Out About." Wherever suitable, suggestions have been inserted of "Things to Make and Do." The appendix contains an extensive bibliography suitable for reference and corollary reading, and an extended disct~ssionon "How to Organize and Conduct a Science Club." The text is profusely
illustrated with practical. familiar, and homely examples of the applications of mametic and electrical principles to evewday experience and to commerce. Each chapter deals either with a general topic, such as magnetic indudion, elett r r heating, radio reception, or with commercial appliances, as electromagnet. dynamo, vacuum tuhe. Statements ol underlying principles arc given as facts, with an absolute minimum of theoretical discussion, accompanied by historical data and numerous interesting examples of practical application. The tent is written in a style that should aooeal to the students for which i t is . Intended, very informal, clear, readable. In order to develop and maintain interest the hook is interspersed with anecdotes, newspaper clippings, and stories from the lives of eminent scientists. This text should serve admirably for the purpose of giving young students an elfmcntary introduction to the phenomena ol magnetism and electricity, and to create an interest in their further study. Thr tcnt belongs in that category of books which tend to popularize science. CHAS.G. EICWLIN ~
UNlYllllSlTY OF M*.YL.*NII Cr,,.,.r
