From verso of card: "You need a tumbler half-full of water, a silk handkerchief, a coin, and (concealed from the audience) a circular glass disc the same size as the coin. Cover the coin with the handkerchief and let your audience feel it through the fold--you contrive that they feel the glass disc, and not the coin, which remains concealed under your hand. Under cover of the handkerchief drop the glass disc into the water. Your audience will think the coin dropped, but the glass disc inside will be invisible. The coin has vanished!"