ve
only 0.04, and a pound of potatoes 0.02 pound of protein. The
materials which have the most fats and carbohydrates have the highest
fuel value. The fuel value of a pound of fat pork may reach 2.995
calories, while that of a pound of salt codfish would be only .315
calories. On the other hand, the nutritive material of the codfish
would consist almost entirely of protein, while the pork contains very
little. Among the vegetable foods, peas and beans have a high
proportion of protein. Oatmeal contains a large proportion also.
Potatoes are low in fuel value as well as in protein, because they are
three-fourths water. For the same reason milk, which is seven-eights
water, ranks low in respect to both protein and fuel value, hence the
reason why it is not so valuable as food for an adult as many of the
other food materials.

These few illustrations will help to show the need of an intelligent
idea of food values before attempting to purchase the supplies for
family use. As one-half a laboring man's income goes towards
providing food, it must follow that such knowledge will help the
housewife very materially in securing the best results from the amount
expended.

The _average daily diet_ of an adult should contain (Church):--

-----------------------------------------------------------------------
NUTRIENTS. | IN 100 PARTS. | EACH 24 HOURS.
--------------------------------|-----------------|--------------------
| | lb. oz. gr.
Water | 81.5 | 5 8 .320
Albuminoids | 3.9 | 0 4 .178
Fat | 3.0 | 0 3 .337
Common salt | 3.7 | 0 0 .325
Phosphates, potash, salts, etc. | 0.3 | 0 0 0.170
-----------------------------------------------------------------------

Quantity of Food Required.

The quantity of food required to maintain the body in a vigorous
condition depends upon the following conditions:--(1) Climate and
season, (2) clothing, (3) occupation, (4) age and sex. In civilized
countries more food is eaten, as a rule, than is necessary to maintain
health and strength. Climate and seasons influence the quantity of
food eaten. A cold, bracing atmosphere stimulates the appetite, tempts
one to exercise, while a hot climate has th