in lead pipes takes up some of the lead. Lead is a poison. You
should let the water run off from a pipe a little while before you use
it. Good water is clear and has no smell or taste. Dirty or yellow
water, or water with a taste or smell, is not fit for use.

=39. Tea and coffee.=--Tea and coffee are steeped in water and used as a
drink. The drink is the water. The tea and coffee are neither food nor
drink. They cause the cells of the body to do more work, and at the same
time they take away the feeling of being tired. They do not give
strength to the body, but are like a whip and make the body work harder.

=40. The appetite.=--When we have so many kinds of food, what kind is
best for us? The taste of food tells us the kind of food to eat. Bread
and meat, and such plain foods, always taste good, and we never get
tired of them. Sugar tastes good until we get enough. Any more makes us
sick. More than enough sugar or starch is found in bread and potatoes.

[Illustration: =One kind of intemperance.=]

If we can eat food day after day, without getting tired of it, the
food is good for us. If we get tired of its taste, either the food is
not good for us or we are eating too much. Bad tasting or bad smelling
food is always dangerous.

We can tell how much food to eat by our _hunger_ or _appetite_. We can
always feel when we have enough. Then is the time to stop.

Sometimes we eat plain bread and meat until we have enough, and then
sweet cake or pie is brought in. Then we have a false appetite for
sweet things. If the sweet things had not made a false hunger, we
should have had enough to eat. But the false appetite makes us want
more, and so we eat too much, and sometimes get sick from it.

=41. Intemperance.=--Eating for the sake of a false appetite is
_intemperance_. Drinking strong drink for the sake of its taste is a
common form of intemperance. But eating too much preserves, pie, and
candy is intemperance too, and can do a great deal of harm. A little
pie, or pudding, or candy, is good, because we can eat our sugar as
well that way as in bread. But we should eat only a little.

=42. Food and Diseases.=--If our food is dirty or is handled with
dirty hands, or is put into dirty dishes, there may be disease germs
in it. Our food should always be clean, and we should have our hands
clean when we handle it or eat it.

Storekeepers sometimes keep fruit and vegetables out of doors where
street dust may blow upon it. Th