e too much trouble for the large brain to stop to think
every time we step, and the little brain has work enough to do in taking
care of the heart and lungs and other organs, without keeping watch of
the feet when we are asleep, so as to pull them up if some mischievous
person tickles them. So Nature puts a few nerve cells in the spinal cord
which can do a certain easy kind of thinking. When we do things over and
over a great many times, these cells, after a time, learn to do them
without the help of the large brain. This is the way a piano-player
becomes so expert. He does not have to think all the time where each
finger is to go. After the tunes have been played a great many times,
the spinal cord knows them so well that it makes the hands play them
almost without any effort of the large brain.

SUMMARY.

1. The part of the body with which we think is the brain.

2. The brain is found filling the hollow place in the skull.

3. There are two brains, the large brain and the small brain.

4. Each brain is divided into two equal and complete halves, thus making
two pairs of brains.

5. The brain is largely made up of very small objects called nerve or
brain cells.

6. The nerve cells send out very fine branches which form the nerves.

7. The nerve branches or fibres run to every part of the body. They pass
out from the brain to the rest of the body through a number of openings
in the skull.

8. Most of the nerve branches pass out through a large opening at the
back of the skull, in one large bundle called the spinal cord.

9. The spinal cord runs down through a canal in the backbone, and all
along gives off branches to the various parts of the body.

10. It gives us pain to prick or hurt the flesh in any way, because when
we do so we injure some of the little nerve branches of the brain cells.

11. When we suffer, we really feel a pain in the brain. We know this
because if a nerve is cut in two, we may hurt the part to which it goes
without giving any pain.

12. We have different kinds of nerves of feeling.

13. There are other nerves besides those of feeling. These are nerves of
work.

14. The nerves of work have charge of the heart, the lungs, the muscles,
the liver, the stomach, and every part of the body which can work or
act.

15. The brain and nerves control the body and make all the different
parts work together in harmony, just as a general controls an army.

16. The brain uses the nerves ve