k all
the time, moving your chest.

If we had to think about it every time we breathed, we should have no
time to think of any thing else.

There is one part of the brain that takes care of such work for us. It
sends the messages about breathing, and keeps the breathing muscles and
many other muscles faithfully at work. It does all this without our
needing to know or think about it at all.

Do you begin to see that your body is a busy work-shop, where many kinds
of work are being done all day and all night?

Although we lie still and sleep in the night, the breathing must go on,
and so must the work of those other organs that never stop until we
die.

OTHER WORK OF THE NERVES.

The little white nerve-threads lie smoothly side by side, making small
white cords. Each kind of message goes on its own thread, so that the
messages need never get mixed or confused.

These nerves are very delicate little messengers. They do all the
feeling for the whole body, and by means of them we have many pains and
many pleasures.

If there was no nerve in your tooth it could not ache. But if there were
no nerves in your mouth and tongue, you could not taste your food.

If there were no nerves in your hands, you might cut them and feel no
pain. But you could not feel your mother's soft, warm hand, as she laid
it on yours.

One of your first duties is the care of yourselves.

Children may say: "My father and mother take care of me." But even while
you are young, there are some ways in which no one can take care of you
but yourselves. The older you grow, the more this care will belong to
you, and to no one else.

Think of the work all the parts of the body do for us, and how they help
us to be well and happy. Certainly the least we can do is to take care
of them and keep them in good order.

CARE OF THE BRAIN AND NERVES.

As one part of the brain has to take care of all the rest of the body,
and keep every organ at work, of course it can never go to sleep itself.
If it did, the heart would stop pumping, the lungs would leave off
breathing, all other work would stop, and the body would be dead.

But there is another part of the brain which does the thinking, and this
part needs rest.

When you are asleep, you are not thinking, but you are breathing and
other work of the body is going on.

If the thinking part of the brain does not have good quiet sleep, it
will soon wear out. A worn-out brain is not easy to repair.