/ | \
/ | \
/ | \
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.

A
/|
/1|
/__|B
/|\ 3|
/3|3\ |
/__|__\|C
/|\ 5|\ 5|
/5|5\ |5\ |