the young man is holding in his hand bore the least resemblance to a lion's head, but there is no mistaking the shadow on the wall.
The most wonderful public exhibitions of optical illusions have been those in which a real ghost or spectre apparently moves across the stage of a theatre. This has frequently been done in late years, both in this country and Europe. The audiences were perfectly amazed to see a spirit suddenly appear, walk about the stage, and act like a regular ghost, who did not seem to be in the least disturbed when an actor fired a pistol at him, or ran him through with a sword. The method of producing this illusion is well shown in the accompanying picture. A large plate of glass is placed in front of the stage so that the audience does not perceive it. The edges of it must be concealed by curtains, which are not shown in the picture. An actor, dressed as a ghost, walks in front of the stage below its level, where he is not seen by the audience, and a strong electric lig