st, and make the most heat and do the most work.

Let us see how this wood or coal we call fuel makes the engine work.
First, we must burn the fuel. Second, when the fuel burns, it heats the
water in the boiler. Third, the water changes into steam, and this steam
gives the engine the power to work.

Now we see how an engine is made to move and do work, such as hauling
great trains of cars, and pulling great ships across the wide ocean. But
we must remember that the engine will not do this work unless there is a
man near-by to put the fuel into the engine.

I want to tell you of another engine that is very like the steam engine.
It too must have fuel before it can run or work. It is unlike the steam
engine in as much as it grows all the time, and it does not need to have
an extra man to put the fuel into it. You must think of your body as an
engine and remember that it needs fuel to run it. The fuel that makes
the body-engine move and work is the food you eat.

You have learned that you must put into the steam engine the fuel that
will burn best and make the most heat and work. The same thing is true
of your body-engine. You must put in the fuel that will best make heat
and the power to work. Have you sometimes eaten something which made you
sick? It must have been that that was the wrong kind of fuel for the
little body-engine. This is the reason our mothers are so very careful
in preparing our food. They want the little engines to have the right
kind of fuel so that they will not run off the track.

Now what fuel must you use in your body-engine? In the first place you
must put in fuel that will make the engine grow so that it can do a
great deal of work. This fuel you get when you eat lean meat, eggs,
milk, and many other things.

If you want your engine to keep warm, you must use fuel that will make
heat. You get this fuel by eating plenty of fats, such as nice butter
and some sweet things. Potatoes, rice and syrup help to run your engine.

You need some fuel that will make you plump and round and healthy
looking, so you must put into your engine fruits, nuts, a little candy,
and a lot of vegetables. You need to eat things that have color, such
as: tomatoes, lettuce, greens, and beets,--not because they look pretty,
but because they have iron in them and help to make your engine strong.

You must remember that you eat food for three reasons: to make you grow,
keep warm, and able to work. You must be careful th