that get into the body. That is why sometimes, when you have had a
chance to take mumps or grippe or some other "catching" disease, you
don't take it. Your liver kills the germs, or seeds. See how carefully
Mother Nature has planned that we may be clean inside as well as
outside.

[Illustration: THE POSITION OF THE LIVER

Compare this with the diagram on page 26, and see how the liver
partly overlaps the stomach.]

But you must not over-work your liver. If you do, it may become too
tired to do anything at all. Then all these poisons will spread
through the body; the skin and the whites of the eyes will grow
yellow, and you will be what is called "bilious." When this happens,
the poisons go to your brain, too, and make you feel sad; your tongue
looks white instead of pink, and you have a disagreeable taste in your
mouth. Your happiness depends very much on your liver.

"How shall I keep my liver rested and in good working order?" By
eating only sound, wholesome, pure food, and avoiding dirty milk; by
going to the toilet regularly every morning after breakfast; by
keeping your windows open and avoiding the poisons and disease germs
in foul air. Then, if you run and play and work out of doors, so that
the muscles move a great deal and you breathe in plenty of oxygen to
keep the body fires burning briskly, that will help a great deal.

Last summer up in the mountains I saw a big log close by the path. It
had been sawed across so that the end was smooth. It was brown and
weather-stained, so of course I knew that it had lain there a long