~4.~ Beef and mutton may be diseased also. Sheep and cattle are
sometimes sick of diseases very much like those which human beings
have. Meat which is pale, yellowish, or of a dark red color, is
unhealthful, and should not be eaten. Meat should never be eaten raw. It
should always be well cooked.

~5. Unripe Foods.~--Most vegetable foods are unfit to be eaten when
green or unripe, especially if uncooked. Sometimes persons are made very
sick indeed by eating such articles as green apples or unripe peaches.

~6. Stale or Decayed Foods.~--Food which has been allowed to stand until
it is spoiled, or has become _stale_, _musty_, or _mouldy_, such as
mouldy bread or fruit, or tainted meat, is unfit to be eaten, and is
often a cause of very severe sickness. Canned fish or other meats spoil
very quickly after the cans are opened, and should be eaten the same
day.

~7. Adulterated Foods.~--Many of our foods are sometimes spoiled or
injured by persons who put into them cheap substances which are harmful
to health. They do this so as to make more money in selling them. This
is called _adulteration_. The foods which are most likely to be injured
by adulteration are milk, sugar, and butter.

~8.~ Milk is most often adulterated by adding water, though sometimes
other things are added. Sometimes the water is not pure, and people are
made sick and die. The adulteration of milk or any other food is a very
wicked practice.

~9.~ Butter is sometimes made almost wholly from lard or tallow. This is