ound to flour. Flour is mixed with water, and yeast is added. The
yeast makes a gas, and the gas puffs up the wet flour and makes it
full of holes. The holes make the bread _light_. Then bread is baked.
Rye or corn meal makes good bread. Cake, biscuit, and pancakes are
much like bread. Sometimes in place of yeast, baking powder is used to
make the bread or cake light.

=33. Meal.=--Oatmeal, corn meal, and cracked wheat and rice are
sometimes boiled, and eaten with milk. Bread, biscuit, oatmeal, and
corn meal are made from grain. All are very much alike. The cooking
makes them look and taste different, but yet they are nearly the same.

=34. Why we need grain food.=--All kinds of grain have much albumin,
but only a little fat. But all have a great deal of starch. By
digestion the starch becomes sugar. Grain is a good food because it
has starch or sugar. Animal foods have no sugar, so we eat grain food
with them. The two together make the most nourishing food. Potatoes
have a great deal of starch and only a little albumin. They also are
good food with meat.

[Illustration: =A healthy man needs as much food as this every day.=]

A person cannot live well upon plant food alone, for it has too much
starch and sugar, and too little albumin and fat. We need nearly equal
parts of albumin, fat, and sugar. A mixture of bread, meat, eggs,
vegetables, and milk makes the best food.

=35. Fruit.=--Fruit, like apples, peaches, and plums all have sugar.
They taste good, and give us an appetite for other kinds of food.
They have little albumin or fat.

=36. Salt.=--There is enough mineral matter in all food, and we do not
have to eat iron or lime or soda. But we do need some more salt. Even
animals need salt. Salt makes food taste good, and helps its digestion.

[Illustration: =People are made sick by drinking water from such a
well.=]

=37. Water.=--Water is also a food, for it forms the most of our
bodies. All food has water. Even dry crackers contain it.

=38. Pure water.=--Water in a well runs through the dirty earth, and
yet is clear and pure. This is because sand holds back the dirt. But
sometimes slops from the house, and water from the barn yard, soak
through the soil until the sand is full. Then the well water will be
dirty and poisonous. People are often made sick by drinking such
water. In cities the dirt fills all the soil and spoils the water. So
the water must be brought from the country in large pipes.

Water