continued until the coin has slipped through the slot into his palm.  The can is then placed on the table with his left hand.  Then apparently he looks for something to cover the can.  This is found to be a handkerchief which was previously prepared on another table concealing the nest of boxes.  The coin in the right hand is quickly slipped into the guide of the nest of boxes, which was placed in an upright position, and the guide withdrawn, and dropped on the table.  The performer, while doing this, is explaining that he is looking for a suitable cover for the can, but as he cannot find one he takes the handkerchief instead.  The handkerchief is spread over the can and then he brings the nest of boxes.  He explains how he will transfer the coin and passes his wand from the can to the boxes.  The can is then shown to be empty and the boxes given to one in the audience to be opened.  They will be greatly surprised to find the marked coin within the innermost box.

** How to Keep Film Negatives [194]

There are many devices for taking care of film negatives to keep them from curling and in a place easily accessible.  Herewith is illustrated a method by which anyone can make a place for the negatives produced by his or her special film camera.  The device is made up similar to a post card album with places cut through each leaf to admit each corner of the negatives.  The leaves are made from white paper and when the negatives are in place the pictures made on them can

[Illustration:  Negatives on White Paper Background]

easily be seen through to the white paper background.  These leaves can be made up in regular book form, or tied together similar to a loose-leaf book, thus adding only such pages as the negatives on hand will require.  —­Contributed by H. D. Harkins, St. Louis, Mo.

** Home-Made Match Safe [194]

[Illustration:  Details of the Match Safe]

Cut a piece of tin in the shape and with the dimensions shown in Fig. 1.  Bend the saw-toothed edges at right angles to the piece on the dotted lines.  Bend the part that is marked 5-1/2 in. in a half circle.  Make a circle 3-1/2 in. in diameter on another piece of tin, cut out the circle and cut the disk in two as shown in Fig. 2.  These half circle pieces are soldered to the sides of the teeth of the half circle made in the long piece of tin.  Remove one end from the inside box containing matches and slip the back of the match safe through between the bottom of the inside box and the open end box that forms the cover.  The matches will fall into the half circle tray at the lower end of the box which will be kept full of matches until they are all used from the box.  —­Contributed by C. F. White, Denver, Colo.

** An Electric Post Card Projector [195]

A post card projector is an instrument for projecting on a screen in a darkened room picture post cards or any other pictures of a similar size.  The lantern differs from the ordinary magic lantern in two features; first, it requires no expensive condensing lens, and second, the objects to be projected have no need of being transparent.