over the coin. Command the penny to disappear, and on removing the cone it will seem to have done so, as the paper over the mouth of the glass, being the same color as that on the tray, effectually conceals the coin. To cause it to reappear you replace the cone and carry away the glass under it. This can be repeated as often as desired.
To make the experiment more effective, use colored paper, which shows up against the coin more than white.
Coins, Hat, and Plate.—In this experiment a number of borrowed and marked coins are passed invisibly into a hat covered with a plate.
Obtain a small metal box large enough to contain half a dozen coins of the kind you intend to use. This box should be enamelled white and have an opening in one side large enough for the coins to pass through. A common pill-box would answer the purpose, but a metal one is preferable. Place a little wax on the top of the box and leave it, with the plate, on a table at the rear of the stage. Borrow a silk hat, which leave on your table. Then obtain the loan of six marked coins, which you change for six of your own, as you go back to the stage. Drop
