For example, the ox and the cow eat grass and furnish us beef and milk.

Chickens eat corn and other grains, and supply us with eggs.
~5.~ The principal animal foods are milk, cheese, eggs, and the different kinds of flesh--beef, mutton, pork, fish, fowl, and wild game.
We obtain a great many more kinds of food from plants than from animals.
Most plant foods are included in three classes--_fruits_, _grains_, and _vegetables_.
~6.~ _Fruits_ are the fleshy parts of plants which contain the seeds.
Our most common fruits are apples, pears, peaches, plums, cherries, and various kinds of nuts.

Perhaps you know of some other kinds of fruits besides those mentioned.

Your teacher will tell you that tomatoes, watermelons, and pumpkins are really fruits, though they are not generally so called.
~7.~ The seeds of grass-like plants are known as _grains_, of which we have wheat, rye, barley, corn, and rice.

There are a few seeds that grow in pods, such as pease and beans, which somewhat resemble grains.
~8.~ We eat the leaves, stems, or roots of some plants, as cabbages, celery, turnips, and potatoes.