24 BULLETIN 540, U. S. DEPARTMENT OF AGRICULTURE. 
Correlation.—Chemistry: Compare the composition of the body — 
with that of some typical foods. 
Supplementary topic—What books on food should a housewife 
have? Plan the entire library of an ideal farmer’s family. What 
general subjects would be included in such a library ? 
LESSON 49. 
Problem.—To bake apples and to cook cranberries. 
Points to be brought out-—Apples cook more quickly with the skins 
on and the coresremoved, Water is unnecessary in most cases. The 
skin keeps in the steam and the volatile flavors. Apples which have 
been pared and cooked without any water in the fireless cooker 
approximate baked apples in flavor. In cooking cranberries we add 
the sugar at the beginning of the operation if we wish the berries to 
hold their shape, at the end if we wish to make a sauce of them. 
Fruits are very valuable in the daily dietary, because they furnish 
mineral matters and mild acids, and should appear in some form other 
than rich preserves at least once daily. | 
Reference —U. S. Dept. Agr., Farmers’ Bul. 293. 
Correlation.—Chemistry: Make a list of some of the chemical 
elements which are important constituents of fruits and list the 
fruits in which they are present in the largest amounts. English: 
List and discuss varieties of apples available in your community. 
What kinds would you like on your farm ? 
LESSON 50. 
Problem.—To study the relation of fresh air and exercise to health. 
Points to be brought out.—Stress the value of fresh air and exercise. 
Night air is not harmful. It has been proved that outdoor sleeping 
even in cold climates increases the resistance to disease and renders 
one less susceptible to colds. 
Reference-—Book on personal hygiene. 
Correlation.—Physical training: Make out a weekly schedule which 
will furnish exercise of the proper type in the required amount; men- 
tion outdoor fun which a neighborhood group or a family group can 
occasionally enjoy together. 
LESSON 51. 
Problem.—To study the relation of personal cleanliness to health; 
toilet soaps. | 
Points to be brought owt.—Personal cleanliness is necessary for the 
best health. It includes daily bath to remove perspiration, oil, etc., 
from the skin; care of teeth; care of hair; sufficient changing of cloth- 
ing; and keeping the digestive tract clean. Constipation is the root of 
many ils. The purpose of the daily bath is to keep clean, not to get 
clean. The bath furnishes exercises to the skin. If one can stand the 
