Cut a block from a board about 3 in. wide and 10 in. long. Sandpaper all the surfaces and round the edges slightly. Mark out seven 1-in. squares on the surface to be used for the top and color the squares alternately white and black. Make six men by sawing a curtain roller into pieces about 3/8 in. thick. Number the pieces 1, 2, 3, 5, 6 and 7, and place them as shown in Fig. 1. The puzzle is to make the first three change places with the last three and move only one at a time. This may be done as follows:

Ill: Position of the Men

Move 1-Move No. 3 to the center. Move 2-Jump No. 5 over No. 3. Move 3-Move No. 6 to No. 5's place. Move 4-Jump No, 3 over No. 6. Move 5-Jump No. 2 over No. 5. Move 6-Move No. 1 to No. 2's place. Move 7-Jump No. 5 over No. 1. Move 8-Jump No. 6 over No. 2. Move 9-Jump No. 7 over No. 3. Move 10-Move No. 3 into No. 7's place. Move ll-Jump No. 2 over No. 7. Move 12-Jump No, l over No. 6. Move 13-Move No. 6 into No. 2's place. Move 14-Jump No. 7 over No. 1. Move 15-Move No. 1 into No, 5's place.

After the 15 moves are made the men will have changed places. This can be done on a checker board, as shown in Fig. 2, using checkers for men, but be sure you so situate the men that they will occupy a row containing only 7 spaces.-Contributed by W. L. Woolson, Cape May Point, N.J.