This is an ordinary tumbler, with a horizontal slit at the side, on a level with the interior bottom, large enough to allow of the passage of a half-crown. If the tumbler be held in such a manner that a finger closes the slit, liquid may be poured into it. This should be done casually, and not professedly for the purpose of showing that there is nothing peculiar about the tumbler, such a suggestion being unnecessary and dangerous. The company would naturally say, "If there be really nothing wrong with it, why does he not place it in our hands for examination?" A coin placed in the tumbler may be got into the hand at any moment viâ the slit, the top being covered with cards, &c., to prevent the exit of the coin that way: as if coins were in the habit of leaping out of tumblers into which they have been placed, and deceiving audiences! Nevertheless, an audience is invariably satisfied when inanimate articles are covered up, and so supererogatorily prevented from performing acts which are not possible to them.