=Secret Writing.= Among the many things that "F. W. P." contains, is the key to _secret writing_. It shows you a very simple way to write letters to your friends, and it is simply impossible for others to read what you have written, unless they know the secret. This, alone is a valuable thing for any boy or girl who wants to have some fun. _The Book, Key, and Complete Outfit will be sent, postpaid, upon receipt of 35 cents, by_ THOMAS M. ST. JOHN, 407 West 51st St., New York City. Fun With Soap-Bubbles. BOOK AND COMPLETE OUTFIT FOR FANCY BUBBLES AND FILMS.... [Illustration] =THE OUTFIT= contains everything necessary for thousands of beautiful bubbles and films. All highly colored articles have been carefully avoided, as cheap paints and dyes are positively dangerous in children's mouths. The outfit contains the following articles: One Book of Instructions, called "Fun With Soap-Bubbles," 1 Metal Base for Bubble Stand, 1 Wooden Rod for Bubble Stand, 8 Large Wire Rings for Bubble Stand, 1 Small Wire Ring, 3 Straws, 1 Package of Prepared Soap, 1 Bubble Pipe, 1 Water-proof Bubble Horn. The complete outfit is placed in a neat box with the book. (Extra Horns, Soap, etc., furnished at slight cost.) =CONTENTS OF BOOK.=--Twenty-one Illustrations.--Introduction.--The Colors of Soap-bubbles.--The Outfit.--Soap Mixture.--Useful Hints.--Bubbles Blown With Pipes.--Bubbles Blown With Straws.--Bubbles Blown With the Horn.--Floating Bubbles.--Baby Bubbles.--Smoke Bubbles.--Bombshell Bubbles.--Dancing Bubbles.--Bubble Games.--Supported Bubbles.--Bubble Cluster.--Suspended Bubbles.--Bubble Lamp Chimney.--Bubble Lenses.--Bubble Basket.--Bubble Bellows.--To Draw a Bubble Through a Ring.--Bubble Acorn.--Bubble Bottle.--A Bubble Within a Bubble.--Another Way.--Bubble Shade.--Bubble Hammock.--Wrestling Bubbles.--A Smoking Bubble.--Soap Films.--The Tennis Racket Film.--Fish-net Film.--Pan-shaped Film.--Bow and Arrow Film.--Bubble Dome.--Double Bubble Dome.--Pyramid Bubbles.--Turtle-back Bubbles.--Soap-bubbles and Frictional Electricity. "There is nothing more beautiful than the airy-fairy soap-bubble with its everchanging colors." _=THE BEST POSSIBLE AMUSEMENT FOR OLD AND YOUNG.=_ _The Book and Complete Outfit will be sent, POST-PAID, upon receipt of 35 cents, by_ THOMAS M. ST. JOHN, 407 West 51st St., New York City. Things A Boy Should Know About Electricity. (In Preparation.) 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.