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.
THE DEMON CORD.
Fig. 24.
Saw a tube in half lengthwise, and at one end mount a grooved wheel, over which passes the bight of a cord, with its two ends passing out of the hollow cylinder at the sides of the other end. Tint one half of the cord a different colour from the other, close it in; varnish well to hide the crack, and your trick is complete.
The cord seems to have the chameleon property of changing its hue.
TO TIE A KNOT ON ONE WRIST WITHOUT THE TOUCH OF THE OTHER HAND.
Fig. 25.
Take a yard of whipcord, or stout fishing-line, one end in each hand, and with the right throw a loop over upon the left hand. Instantly draw back the right hand to tighten the loop, and let go both ends the moment the knot has been made.