While sitting at the table turn up your right sleeve, and, taking a
half-crown or penny, rub it against your cheek, and then, as if by
accident, drop it on the table. Pick up the coin and repeat the process,
this time resting your elbow on the table, as you explain, to steady it.
Move your hand from your cheek, and the coin has disappeared, and with
your left hand produce it from your elbow. Then say, "I will reverse the
experiment and send the coin back." Place your empty hand against your
face and your left hand containing the coin under your elbow. After
rubbing your face and chin, show the coin again in your right hand and
your left hand empty. You require two coins for this trick, one palmed
in your left hand. When you rub the coin against your face the second
time, drop it inside your collar and produce the palmed coin from your
elbow. When you "reverse the experiment," take the coin from your collar
as you are rubbing your face and chin and drop the other coin from your
left hand into your handkerchief spread over your knees.