One of the best puzzles hitherto made is represented in the annexed cut. A is a piece of card; b b a narrow slip divided from its bottom edge, the whole breadth of the card, except just sufficient to hold it on at each side; c c is another small slip of card with two large square ends, e e; d is a bit of tobacco-pipe, through which c c is passed, and which is kept on by the two ends e e. The puzzle consists in getting the pipe off without breaking it or injuring any other part of the puzzle. This, which appears to be impossible, is done in the most simple manner. On a moment's consideration it will appear plainly that there must be as much difficulty in getting the pipe in its present situation, as there can be in taking it away. The way to put the puzzle together is as follows: The slip c c e e is cut out of a piece of card in the shape delineated in Fig. 3. The card in the first figure must then be gently bent at A, so as to allow of the slip at the bottom of it being also bent sufficiently to pass double through the pipe, as in Fig. 2. The detached slip with the square ends (Fig. 3) is then to be passed half way through the loop f at the bottom of the pipe; it is next to be doubled in the center at a, and pulled through the pipe, double; by means of the loop of the slip to the card. Upon unbending the card the puzzle will be complete, and appear as represented in Fig. 1.
20. THREE SQUARE PUZZLE.
Cut seventeen slips of cardboard of equal lengths, and place them on a table to form six squares, as in the diagram. It is now required to take away five of the pieces, yet to leave but three perfect squares.
21. THE CYLINDER PUZZLE.
Cut a piece of cardboard about four inches long, of the shape of the diagram, and make three holes in it, as represented. The puzzle is, to make one piece of wood to pass through, and also exactly to fill, each of the three holes.
22. PUZZLE OF THE FOUR TENANTS.
