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Puritanos 80.90 .85 Electricity from Magnetism; the Influence of a Spiral Conductor in Increasing the Intensity of Electricity from a Galvanic Arrangement of a Single Pair, etc.; Electro-dynamic Induction; Induction from Ordinary Electricity; and Oscillatory Discharge. In Volume 2 are sketches on Induction of Electric Currents; the Evolution of Electricity from Magnetism; a New Electrical Condition of Matter: Arago's Magnetic Phenomena; Terrestrial Magneto-Electric Induction; Force and Direction of Magneto-Electric Induction Generally; the Induction of an Electric Current on Itself; Inductive Action of Currents in General; and the Relation of the Electric and Magnetic Forces, ending with a biographical sketch of Faraday. These books are very interesting and instructive from the historical standpoint, as they recount the efforts of those great experimenters, Henry and Faraday, whose untiring zeal finally led to the most important discovery ever made in the electrical field-namely, that of Electro-magnetic Induction. The Fundamental Laws of Electrolytic Conduction. Memoirs by Faraday, Hittorf, and F. Kohlrausch. Translated and edited by H. M. Goodwin, Ph. D. Pages 98. Harper's Scientific Memoirs Series. New York and London: Harper & Bros. Price, 75 cents. This little volume contains sketches on Relation by Measure of Common and Voltaic Electricity and on Electro-Chemical Decomposition; a Biographical Sketch of Faraday; The Migration of Ions during Electrolysis; a Biographical Sketch of Hittorf: the Conductivity of Electrolytes Dissolved in Water in Relation to the Migration of their Components; and a Biographical Sketch of Kohlrausch. The contents will be found of much interest, as the book presents the papers on Electro-Chemistry which contain the original statement of the fundamental laws and experiments on which the modern theory of Electrolytic Conduction is based. Diseases of a Gasoline Automobile, and How to Cure Them. By A. L. Dyke and G. P. Dorrise. Pages 232; 12mo. St. Louis, Mo.: Dyke Automobile Supply Company. Price, $1.50. Perhaps there is no more interesting as well as valuable book published dealing with the different phases of a gasoline automobile, than this work issued by the Dyke Automobile Supply Company. From every point of view it is practical, and every page contains information of a nature that is sure to prove of service to the man who owns an automobile. A careful reading of this work will make a man to a large extent independent of repair shops. It should be carried in the tool-box of every automobile on every trip as an essential part of the equipment. All the different parts of the automobile are brought up for consideration-batteries, tires, gears, all receive attention. The drawings are good, the language is simple and well expressed. We prophesy for this work a large sale. Machine Shop Arithmetic. By Fred H. Colvin and Walter Lee Cheney. Pages 131. New York: The Derry-Collard Company. "Machine Shop Arithmetic " is the title of a small "Pocket Book containing some of the problems of every-day shop happenings.' " This book is written in a very clear and concise manner. It is adapted to the busy machinist who has not time to read an elaborate treatise. It is practical, dealing with problems constantly occurring in the machine shop— such, for example, as those involving screw-cutting, gears, threads, bolts and nuts, speeds of milling cutters, drills, taps, etc. The part devoted to arithmetic is very practical and easily understood. The theory of square and cube root is explained. better than in most regular textbooks. The numerous tables, such as those for cutting speed, bolt tables, metric tables, etc., add to the value of the book, as they are used constantly. Air-Brake Catechism. By R. H. Blackall, Air-Brake Instructor and Inspector with Westinghouse Air-Brake Co. Pages 300. New York: Norman W. Henley Co. Price, $2.00. The eighteenth edition of this book has been received from the press. It is in the usual catechism form of questions and answers, so well adapted for those desiring brief, explicit information. The first chapters deal with the Plain Triple, Quick-Action Triple, Troubles of the Triple, Freight Equipment, Slack Adjuster, Retaining Valve, Train-Line Governor, and other devices. Additional features are chapters on the Water Brake, Whistle, Signal, High-Speed Brake, and Recording Gauges. The practical infor Michigan Central The Niagara Falls Route To all Eastern and Northern points. Send three red stamps for Summer Vacation Tours. 0. W. RUGGLES, G. P. & T. A., CHICAGO Timber Crib Foundations By GEORGE B. FRANCIS Boston Society of Civil Engineers Geological Place of the By HERBERT W. PEARSON JOHN C. TRAUTWINE, Jr. Secretary, 257 South 4th Street, :: PHILADELPHIA THE WORLD TO-DAY POCKET ATLAS is a marvel. It contains 574 pages (size 32x54 in.); 105 full and double page maps in colors; population of over 40,000 places, according to latest census. An Atlas is indispensable yet the large volumes are seldom used because they are cumbersome and not readily accessible. This Atlas is suitable for the desk,schoolroom, or can be easily carried when traveling and it answers every purpose of the larger volumes. It is handsomely bound in cloth, stamped in colors and retails at $1.00. We offer this famous Pocket Atlas free with a four months' trial subscription to THE WORLD TO DAY The World To-Day is one of the largest and handsomest monthly magazines published. It gives monthly a complete record of the progress of the world in every department, and a large number of leading articles on subjects of current interest. It has a regular staff of over 50 Editors and Contributors, and is founded on a new idea that has proven exceedingly popular. It is forceful, aggressive and reliable. No progressive person can afford to do without it. 144 pages and over 125 beautiful illustrations every month. $3.00 PER YEAR. 25cts. A COPY. For the purpose of introducing THE WORLD TO-DAY to new readers we make the following mation on train inspection and handling should be of great value to those who handle the air brake and who must remedy various troubles. Leverage problems are well explained with numerous diagrams and examples. In addition to the several folded plates in the book, the publishers furnish two large colored plates, one of which shows the standard equipment for freight engines, and the other the equipment for passenger engines and cars, including the signal equipment. Elements of Chemistry. A short elementary treatise for beginners. By Rufus P. Williams, author of "Introduction to Chemical Science,'' "Laboratory Manual of Inorganic Chemistry." etc. Pages 400; 12mo. Boston: Ginn & Company. Price, $1.10. The aim of this book is to make the science of Chemistry so simple that the beginner will not become discouraged before mastering the underlying principles. Although elementary, it is free from the "popular style" and is in reality a school textbook. The chapter on Valence is exceptionally good, the elements being represented by cubes and the valence by hooks. Carefully selected exercises enable the student to test his knowledge from time to time. The book gives directions for about 350 graded experiments. General Data on Thomson Recording Wattmeters. Schenectady, N. Y.: General Electric Company. This book of 217 pages treats, as its name indicates, of the Thomson recording wattmeter. It is well arranged, and contains much valuable information upon this much used apparatus. Cuts are given of the different forms of recording wattmeter; and this is followed by a discussion of the instruments themselves, containing full instruction in regard to their construction and operation, explaining how they should be installed, the proper care to be given, methods of testing, reading, etc. Then follow tables of the constants and ratio of gears, comparative speeds of meters, armature data, etc. Next comes a section on dimensions consisting of tables and detail sketches. A very valuable section of the book is that devoted, with the very clear diagrams, to the connections of all the different types of meters upon the market. CATALOGUES RECEIVED American School of Household Economics. 3311 Armour Ave., Chicago, Ill. The very attractive announcement of the American School of Household Economics is at hand. This outlines a distinctively new branch of correspondence education. Apparently the aim is to accomplish for women in the home something of the same good that correspondence study accomplishes for the engineer, the electrician, and the mechanic in the workshop. The "General Statement" brings out the fact that while the conditions in the home are vastly different from what they were two generations ago, yet housekeeping is governed by traditions. that have come down from that time, and science has not thus far had the profound effect in modifying practices in the home that it has had in the workshop and the factory. Attention is called to the regrettable fact that most women have had no special training for their life work-"that of home-making." "To all home-makers-present or prospective-who have not had the advantage of careful home training, study of household economics is imperative; and even for such fortunate ones, further study is necessary to acquire modern ideas of sanitation, of the care and training of children, of the laws of hygiene and the treatment of sickness." The subjects in which instruction is offered are the following: "Household Chemistry;" "Household Bacteriology;" "House Sanitation;" "Food and Dietetics" "Scientific Principles of Cookery;" "The House-Its Plan, Decoration, and Care;" "Household Management Accounts;" "Hygiene;" "Home Care of the Sick" "Study of Child Life;" "Care of Children;" "Textiles and Clothing." and The list of the teachers and authorities who have prepared the lesson papers for the courses gives assurance of a high standard of work. Among these are: Mrs. Alice P. Norton, Associate Professor Home Economics, College of Education, University of Chicago; Miss S. Maria Elliott, Instructor in Household Economics, Simmons College, Boston; Dr. Alfred C. Cotton, Associate Professor Diseases of Children, Rush Medical College; Miss Isabel Bevier, Professor of Household Science, University of Illi |