WRITING ON THE WALL.
A hand appears on the wall, and writes, and then rubs out what it has written. Light the gas in a dark room. Next procure a mirror, stand at the door of the room, and hold the mirror so that it will throw the light of the gas on the wall or a white sheet outside of the room. Now observe that, by holding your hand over the face of the mirror, the same hand appears on the white wall or sheet. Next procure a small paint-brush, about the size of a pen, and dip it in black paint, and then make any figure or character the reverse way on the mirror, and of course the same will appear on the wall on which the mirror reflects. Now lay the brush aside, and rub out the figures or characters off the mirror, and of course they will disappear off the wall also.