CHAPTER XXIII.
HOW TO KEEP THE BRAIN AND NERVES HEALTHY.
~1.

Uses of the Brain.~--What do you think a boy or girl would be good for without any brain or nerves?
Such a boy or girl could not see, hear, feel, talk, run about, or play, and would not know any more than a cabbage or a potato knows.

If the brain or nerves are sick, they cannot work well, and so are not worth as much as when they are healthy.
~2.

The Brain Sympathizes with Other Organs.~--Did you ever have a headache?
Did you feel happy and good-natured when your head ached hard, and could you study and play as well as when you are well?
It is very important that we should keep our brain and nerves healthy, and to do this we must take good care of the stomach and all other organs, because the brain sympathizes with them when they are sick.
~3.

We must have Pure Air.~--How do you feel when the school-room is too warm and close?
Do you not feel dull and sleepy and so stupid that you can hardly study?
This is because the brain needs good, pure blood to enable it to work well.