hould be trimmed

If you are quite strong, five times a day is often enough: when you
first get up, at recess, at noon, at four o'clock, and at bedtime. Many
children do it much oftener than this; but as they grow older and
the muscles grow stronger, they slowly outgrow
this trouble, if they try to form the right habits. There are many
diseases of the kidneys; for, like the liver, they are sometimes
over-worked
and do not carry the poisons from the body. You are helping your kidneys
when you drink plenty of fresh clean water
every day, and also when you play or work
hard enough to get into a good perspiration; for, as perspiring carries
out some of the poisons, it leaves less for the kidneys to pour out. You
ought
to get
into a good perspiration at least once every day, or better, three or
four times, if you wish to keep healthy. The Bible says, "In the sweat
of thy brow shalt thou eat bread"; and you must earn health and
happiness at the same price.
II. SOME FOES TO FIGHT You have seen that sitting or sleeping in rooms
where

the air is bad, or eating the wrong kind of food, or working after you
are badly tired, will poison your blood and hinder the proper working of
that beautiful
machine, your body. These poisons are made inside your body, and you can
prevent them by living healthfully
and wholesomely. But there are other
poisons, which may get into the blood from outside the body; and while
it is best for you not to think too much about these, or to worry over
dangers that
may never come, yet it is well to know just enough about some of them to
be able to keep out of their way, as far as possible. The most dangerous
form of poisons from outside the body are those made by the germs of
some rather common d