[Illustration: Fig. 23.]
Tie the ends of two feet of string together. Put it through a
button-hole of your coat (or the ring of a key in the door); stick one
thumb in each end, and each little finger in the upper string of the
other hand. Draw out the hands, and present the figure traced in the
illustration.
Let go with the right thumb and left little finger, and thrust your
hands quickly apart, when you will seem to have pulled the string
through the braid of the button-hole, and yet there will be no trace of
the passage. It is best, when you let go with the right thumb, to change
the string from the right little finger to it.