6. These teeth are growing all the while; and if he does not gnaw something hard nearly every day, so as to wear them off, they will soon become so long that he can not use them.
LESSON XXV.
STORIES ABOUT MICE.
When the cat's away
The mice will play.
1. Mice increase so fast that, if we did not have some way to destroy them, they would soon overrun the house, so that we could not live in it.
2. They have their homes in the hollow walls, and can go about from one part of the house to the other without being seen; and when they smell food they gnaw a hole through the wall to get at it.
3. They are playful little animals, and may easily be tamed. When a mouse comes into the room where people live, it is ready to run away at once if anything moves.