To Discover Card by Weight.
Desire any person in company to draw a card from the pack, and when he has looked at it, to return it to you with its face downward; then, pretending to weigh it nicely, take notice of any particular mark on the back of the card, which, having done, put it among the rest of the cards, and desire the person to shuffle them as much as he pleases; then, receiving the pack from his hands, you pretend to weigh each card as before, and proceed in this way until you discover, from the back of it, the particular card he selected.