=CONTENTS:= _Chapter_ I. About Frictional Electricity.--II. About Magnets and Magnetism.--III. How Electricity is Generated by the Voltaic Cell.--IV. Various Voltaic Cells.--V. About Push-Buttons, Switches and Binding-Posts.--VI. Units and Apparatus for Electrical Measurements.--VII. Chemical Effects of the Electric Current.--VIII. How Electroplating and Electrotyping are Done.--IX. The Storage Battery and How it Works.--X. How Electricity is Generated by Heat.--XI. Magnetic Effects of the Electric Current.--XII. How Electricity is Generated by Induction.--XIII. How the Induction Coil Works.--XIV. The Electric Telegraph, and How it Sends Messages.--XV. The Electric Bell and Some of its Uses.--XVI. The Telephone, and How it Transmits Speech.--XVII. How Electricity is Generated by Dynamos.--XVIII. How the Electric Current is Transformed.--XIX. How Electric Currents are Distributed for Use.--XX. How Heat is Produced by the Electric Current.--XXI. How Light is Produced by the Incandescent Lamp.--XXII. How Light is Produced by the Arc Lamp.--XXIII. X-Rays, and How the Bones of the Human Body are Photographed.--XXIV. The Electric Motor and How it Does Work.--XXV. Electric Cars, Boats and Automobiles.--XXVI. A Word About Central Stations.--XXVII. Miscellaneous Uses of Electricity. This book explains, in simple, straightforward language, many things about electricity; things in which the American boy is intensely interested; things he wants to know; things he should know. It is free from technical language and rhetorical frills, but it tells how things work, and why they work. It is brimful of illustrations--the best that can be had--illustrations that are taken directly from apparatus and machinery, and that show what they are intended to show. This book does not contain experiments, or tell how to make apparatus; our other books do that. After explaining the simple principles of electricity, it shows how these principles are used and combined to make electricity do every-day work. _Everyone Should Know About Electricity._ A VERY APPROPRIATE PRESENT THIRD EDITION How Two Boys Made Their Own Electrical Apparatus. Containing complete directions for making all kinds of simple electrical apparatus for the study of elementary electricity. By PROFESSOR THOMAS M. ST. JOHN, New York City. The book measures 5 × 7½ in., and is beautifully bound in cloth. It contains 141 pages and 125 illustrations. Complete directions are given for making 152 different pieces of Apparatus for the practical use of students, teachers, and others who wish to experiment. PRICE, POST-PAID, $1.00.