They don't go out into the clean fresh air for fear they'll be too
cold! It seems a pity we can't just live out of doors all the time.
Perhaps we shall some day; for doctors are finding out that fresh
outdoor air and good food are the very best medicines known, and the
only "Sure Cures." They are pleasant to take, too. Many cities are
providing outdoor schools for children who have weak lungs or are not
strong in other ways. Perhaps some day all school children will be
allowed to study in the open air at least part of every school day.


II. HEARING AND LISTENING

Now you are all ready to go to work. What are you going to work with?
Books? pencils? paper? Yes, but you have something better than those
and all ready for use. It is that little kit of tools that are
sometimes called our "Five Senses." You remember that we have already
talked about one of them, the sense of touch in the skin. Now which
one are you going to use first this morning? If your teacher talks to
you, I hope it will be the one we call the sense of hearing. Suppose
we try to find out something about this sense of hearing, and begin
with a little experiment.

Take a piece of cork in your hand and lift it up high and then let it
drop into a large basin or tub of water. What happens? The cork
strikes and then goes bob-bob-bobbing up and down on its own waves.
Now watch the little waves all around the cork. Where do they stop?
They don't stop until they touch the edge of the pan; and no matter
how big the pan is, the waves go on and on until they reach the edge.

We can see these waves of water, and so we easily believe that they