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.