free Irom misprints. The following changes are suggested for future editions of the book. The table of specific gravities and normalities, page 72, would he more adaptable to American practice if the data were given for 2 5 T . instead of 15'C. The latest international table of atomic weights should be used to avoid confusion. I t would be better in several instances if the amounts of substances used in reactions were stated more definitely, i. e., the directions "add a little water" or "add an excess" might be interpreted differently by different analysts. On page vi, line 22, threc should read there. The second paragraph on page 46 is a hit ambiguous and would be clearer if not translated quite so literally. L. C. CADV
illustrated with practical, familiar, and homely examples of the applications of magnetic and electrical principles t o everyday experience and to commerce. Each chapter deals either with a general topic, such as magnetic induction, electric heating, radio reception, or with commercial appliances, a q electromagnet, dynamo, vacuum tube. Statements of underlying principles are given as facts, with an absolute minimum of theoretical discussion, accompanied by historical data and numerous interesting examples of practical application. The text is written in a style that should appeal to the students for which i t is intended, very informal, clear, readable. In order to develop and maintain interest the bouk is interspersed with anecdotes, newspaper clippings, and stories from the UNIVBRSLTY 0. IDAAL) MOSCOW, IDAAO lives of eminent scientists. This text should serve admirably for the Magnetism and Electricity. MORRIS purpose of giving young students an eleMlsTEx. New York Training School mentary introduction t o the phenomena of for Teachers, College of the City of magnetism and electricity, and t o create New York, and Editor, The Science an interest in their further study. The Classroom. Charles Scribner's Sons, text belongs in that category of books 210 pp. New York City, 1929. xiv which tend to popularize science. 149 illustrations. 13 X 19 cm. $1.00. CHAS.G. EICHLIN U N l V B R S l T Y OP M A R Y L A N D This book is the third of a series of four COLLECBPARX, MD. texts, "Living in a World of Science," which endeavors to "humanize the scientific facts, principles, and conceptions of the world in which we live." It ic intended t o present some of the principles of magnetism and electricit" in a form understandable for pupils of the seventh and eighth grades. The subject matter is divided into sisteen chapters on "a chapter a week" plan. Each is concluded with a "truefalse," or similar test, "How Much Do I Remember?" and a list of "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 discussion on "How to Organize and Conduct a Science Club." The text is profusely
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