With regard to playing Lag Out so as to win, you must further understand the principle of reflected motion. If you throw your marble in a straight line against the wall, you find that it comes back to you nearly in a straight line again. If you throw it ever so slightly on one side, or obliquely, it will fly off obliquely on the opposite side. If you throw the marble from the point C to the point B, it will fly off in the direction of the point A, and if a marble lay there it would hit it; but if you threw it from the point D, you would stand no chance. WALL _________________ B /|\ / | \ / | \ / | \ / | \ / | \ / | \ / | \ C D A In science, the angle C, B, D, is called the angle of incidence, and D, B, A, is called the angle of reflection. THREE HOLES. [Illustration] Three Holes is not a bad game. To play it, you must make three small holes about four feet apart: then the first shot tries to shoot a marble into the first hole. If he gets in, he goes from that to the second, and then to the third hole, after which he returns, and having passed up and down three times, he thus wins the game. If he cannot get in the first hole, the second player tries; and when he stops short at a hole, the third, and so on. After any player has shot his marble into a hole, he may fire at any adversary's marble to drive him away, and, if he hits him, he has a right to shoot again, either for the hole or any other player. The game is won by the player who gets first into the last hole and works his way back again to the first, when he takes all his adversaries' marbles. ARCHES. [Illustration] To play arches, the players must be provided with a board of the following shape, with arches cut therein; each arch being a little more than the diameter of a marble, and each space between the arches the same. +-----------------------------------------------+ | | | 8 6 5 3 1 2 4 7 9 | | +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ | | | | | | | | | | | | | | | | | | | | | +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ +--+ The boy to whom the bridge belongs receives a marble from each boy who shoots, and gives to each the number of marbles over the arches should they pass through them. BONCE-EYE. Bonce-Eye is played by each player putting down a marble within a small ring, and dropping from the eye another marble upon them so as to drive them out, those driven out being the property of the Boncer. The law of falling bodies may be well illustrated by this game. It is one of the laws of motion, that the velocities of _falling bodies_ are in proportion to the space passed over; and the space passed over in each instant increases in _arithmetical progression_, or as the numbers 1, 3, 5, 7, 9.