[Illustration: "HOW TWO BOYS MADE THEIR OWN ELECTRICAL APPARATUS" Gives Proper Designs--Designs for over 150 Things.] JUST PUBLISHED. 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 × 7-1/2 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. The shocking coils, telegraph instruments, batteries, electromagnets, motors, etc., etc., are so simple in construction that any boy of average ability can make them; in fact, the illustrations have been made directly from apparatus constructed by young boys. The author has been working along this line for several years, and he has been able, _with the help of boys_, to devise a complete line of simple electrical apparatus. _THE APPARATUS IS SIMPLE because the designs and methods of construction have been worked out practically in the school-room, absolutely no machine-work being required._ _THE APPARATUS IS PRACTICAL because it has been designed for real use in the experimental study of elementary electricity._ _THE APPARATUS IS CHEAP because most of the parts can be made of old tin cans and cracker boxes, bolts, screws, wires and wood._ Address, THOMAS M. ST. JOHN, 407 West 51st Street, New York. Fun With Magnetism. BOOK AND COMPLETE OUTFIT FOR SIXTY-ONE EXPERIMENTS IN MAGNETISM.... [Illustration] Children like to do experiments; and in this way, better than in any other, _a practical knowledge of the elements of magnetism_ may be obtained. These experiments, although arranged to amuse boys and girls, have been found to be very _useful in the class-room_ to supplement the ordinary exercises given in text-books of science. To secure the best _possible quality of apparatus_, the horseshoe magnets were made at Sheffield, England, especially for these sets. They are new and strong. Other parts of the apparatus have also been selected and made with great care, to adapt them particularly to these experiments.--_From the author's preface._ =CONTENTS.=--Experiments With Horseshoe Magnet.--Experiments With Magnetized Needles.--Experiments With Needles, Corks, Wires, Nails, etc.--Experiments With Bar Magnets.--Experiments With Floating Magnets.--Miscellaneous Experiments.--Miscellaneous Illustrations showing what very small children can do with the Apparatus.--Diagrams showing how Magnetized Needles may be used by little children to make hundreds of pretty designs upon paper.