TO RENDER THE VISIBLE INVISIBLE.

Make two ink-blots on a piece of white paper, in the same straight line, but about three inches apart. Now hold the paper exactly in front of the eyes at the ordinary reading distance, and close the right eye. Look at the right-hand spot with the left eye; by moving the paper slowly upwards and downwards a position will be readily obtained in which the left-hand spot will disappear.

THE MAGIC LANTERN.

A simple magic lantern may be without difficulty constructed by adopting the following plan. Get a box either of tin or wood and make a hole in the top, into which fit a chimney for the escape of the heated gases from the lamp; the bottom of the box should also have a few holes for the admission of air to supply the lamp. In the front of the box, make a hole about one and a half inches in diameter, and fit into it a "plano-convex lens (to be obtained from the optician). Make a tin tube an inch and a half in diameter and about four inches long, and fit into one end a double convex lens. Make a frame to receive this tube, and fasten it to the front of the lantern in such a way as to leave a space

between it and the plano-convex lens for the slides to be passed through. The tube should be rendered movable, so that the focus of the lantern may be adjusted. Behind the light, which may be any ordinary form of lamp or the lime-light, a concave mirror made of polished tin, should be placed. Slides for the lantern may be bought very cheaply, or they may be prepared by any one possessing a little artistic skill. The colours employed must be transparent.

MAGNETIC TOYS.

Magnetic toys, such as swans, fish, boats, &c., may be made of any light material, such as cork or elderpith. Much pleasant occupation for winter evenings may be found in shaping these light objects, and if a small piece of steel or iron be placed in some prominent part of the object, it will float about in the water in obedience to the movements of a magnet held near it. Broken pieces of needles, if carefully handled, do very well to fasten into the floating objects, and serve as points to be attracted by the magnet.

TO MAKE A MAGNET.

Borrow or buy an ordinary bar magnet or a horseshoe magnet, the first-named is the preferable shape.

Take a knitting needle or any piece of tolerably hard steel, and with one pole of the magnet rub it from end so end. Repeat this process several times, being careful to bring the magnet back without touching the needle to the end from which you started; in other words the rubbing must be in one direction only. If a horse-shoe magnet be employed, start from the middle of the knitting needle, pass the magnet along to either end, then bring it through the air to the other end, and stroke the needle several times, finishing in the middle.

t

THE END.

Printed by Gilbert and Rivington, Limited, St. John Square, E.C.

BOOKS FOR THE YOUNG,

OF ALL AGES,

SUITABLE FOR PRESENTS AND SCHOOL PRIZES.

ARRANGED ACCORDING TO PRICES,

FROM HALF-A-GUINEA TO FOURPENCE EACH.

GRIFFITH AND FARRAN,

(SUCCESSORS TO NEWBERY AND HARRIS),

WEST CORNER OF ST. PAUL'S CHURCHYARD, LONDON.

E. P. DUTTON AND CO., NEW YORK.

A

IOM. 10.81.

Cancelling all previous Editions of this Catalogue.