REQUISITES.--An ordinary pack of cards and two extra cards stuck
securely together.
Place the double card below a previously noted card. Hold the pack in
the left hand so that the thumb can pass readily down the cards at the
upper corner. Now pass the thumb of the right hand down the cards so as
to ruffle them. You will find that the thumb is automatically stopped at
the double card. By requesting a spectator to take the card immediately
above the break in the pack, you can then proceed with any trick in
which a forced card is necessary. Numerous other uses for the double
card will readily occur to my readers from the hint given.