Three-Square Puzzle.—Cut seventeen slips of cardboard of equal lengths, and put them on a table to form six squares, as in the figure. Now take away five of the pieces, leaving only three perfect squares.
Six and Five Make Nine.—Draw six vertical lines, and, by adding five more lines let the whole make nine.
Six and Five Make Nine.
Cylinder Puzzle.—Cut a piece of cardboard about four inches long, of the oblong shape of the figure, and make three holes in it as shown. Make one piece of wood pass through, and also exactly fill, each of the three holes.
Cylinder Puzzle.
A Button Puzzle.—In the middle of a piece of leather make two parallel cuts, and below a small hole of the width of the distance between the cuts, pass a piece of string under the slit and through the hole, as in the diagram, and tie two buttons much larger than the hole to the ends of the string. The problem is to draw the string out without taking off the buttons.
