In a common pack of cards let the ace of hearts and nine of spades be something larger than the rest. With the juice of lemon draw over the ace of hearts a spade, large enough to cover it entirely, and on each side draw four other spades. Present the pack to two persons, so adroitly, that one of them shall draw the ace of hearts, and the other the nine of spades, and tell him who draws the latter, to burn it on a chafing-dish. You then take the ashes of that card, put them into a small metal box, and give it to him that has the ace of hearts, that he may himself put that card into the box and fasten it. Then put the box for a short time on the chafing-dish, and let the person who put the card in it take it off, and take out the card, which he will see is changed into the nine of spades. _The Convertible Cards._ To perform this amusement you must observe, that there are several letters which may be changed into others, without any appearance of the alteration, as the _a_ into _d_, the _c_ into _a_, _e_, _d_, _g_, _o_, or _q_; the _i_ into _b_, _d_, or _l_; the _l_ into _t_; the _o_ into _a_, _d_, _g_, or _q_; the _v_ into _y_, &c. Take a parcel of cards, suppose twenty, and on one of them write with juice of lemon or onion, or vitriol and water, the word law, (these letters should not be joined;) and on the other, with the same ink, the words _old woman_; then holding them to the fire, they both become visible. Now, you will observe, that by altering the _a_ in the word _law_ into _d_, and adding _o_ before the _l_, and _oman_ after the _w_, it becomes _old woman_. Therefore you make those alterations with the invisible ink, and let it remain so. On the rest of the cards you write any words you think fit. Present the cards in such manner to two persons, that one of them shall draw the word _law_, and the other the words _old woman_. You then tell the person who drew the word _law_, that it shall disappear, and the words on the other card shall be written in its place; and, that you may not change the cards, desire each of the parties to write his name on his card. Then putting the cards together, and holding them before the fire, as if to dry the names just written, the word _law_ will presently change into _old woman_. _The Enchanted Palace._