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Rh diminution of an ordinary billiard ball, first to half its original size, secondly to one-quarter its original size, and finally to a very small ball, with which several amusing passes are made, and which afterward disappears entirely.

In this case a trick ball is used of a size equal to half that of the ordinary one, and hollowed out so as to contain a solid ball of a diameter equal to half that of itself, (Fig. 26). The hollow ball must be so constructed that the small one pinches slightly into it, but can be instantly released by simply passing the ball of the thumb over it. A duplicate of this small ball should be placed in the right hand waistcoat pocket for use in the latter part of the trick.

The trick ball is placed in the left pochette, whence it is obtained and used according to the instructions given in the "Color-changing Balls." To produce the smallest size, hold the trick ball in the left hand, having previously loosened the small one, and in the act of stroking it with the right hand, palm off the hollow ball, and dispose of it as soon as possible.