THE DAGGER OF MACBETH.
A table is shown on which is a looking-glass. The room is darkened, when a white arm and a hand brandishing a dagger is seen suddenly to appear and menace the spectator.
Explanation.—The glass of the mirror slides out of the frame at a signal. Behind it is a concave mirror set on the floor at an angle in an opening in the wall. Within the other room an arm and hand of wax, holding a dagger, are mounted so as to descend, while brilliantly illumined, towards the concave mirror.
A person can show his or her face instead of his arm or the false limb, and something rather laughable than terrifying is recommended for such experiments to a juvenile auditory.