If the pack is placed between the finger and thumb of one of the
company, holding it by one corner, and you strike them abruptly upwards
with your wand while the grasp is tight, the cards will fly away, except
the uppermost one. This will be caught between the fingers, on their
coming naturally together on closing the pack between them.
_Variation._—If the blow is given downwards the bottom card will be
similarly retained.
It follows that if you have placed a selected card in either of the
above positions described, it must be the one which is thus left in the
person’s hold.