Student: I want you here, Jem.
Voice: I am coming directly.
Student: Which way, Jem?
Voice: Over the roof and down the trap. (Voice is supposed to be moving as the student turns and points with his finger.)
Student: Which way?
Voice (nearer): Through the trap and down the stairs.
Student: How long shall you be?
Voice: Only a few minutes. I am coming as fast as I can.
The voice now approaches the door, and is taken up by the same tone, but produced as in the first voice. As another illustration, we will introduce the reader to
The Invisible Sweep.—This is a striking example of the second voice. Let the student pretend to look up the chimney, and rehearse the following or some similar colloquy:—