264 
SCOUTING FOR GIRLS 
frequent intervals. You will find that work goes better, 
and that you do not tire so easily if you make it a rule 
to open the windows and doors and move about the room 
for five minutes every hour or two. Sleep with win- 
dows open or out of doors. Camp and hike as often as 
possible. Work in the garden. Play out-of-door games. 
Heat— The proper temperature of the body is between 
98 and 99 degrees Fahrenheit. Human life depends upon 
the maintenance of this temperature at all times, and very 
slight changes either up or down interfere seriously with 
all the other life processes. The main source of heat is 
from food consumed, or really burned, in the body. 
Artificial heating in houses helps conserve the body heat, 
as does clothing. But clothes and shelter may make you 
overheated, which is nearly as bad as being cold ; they 
may also shut out fresh air. Clothes should not be too 
heavy nor too tight. Shoes should have soles straight 
on the inner side, and be broad enough to allow the toes 
full play, and have low heels. Shoes that are comfort- 
able to hike in are apt to be the best for all the time wear. 
At night the clothes worn during the day should be 
aired and dried thoroughly. This will help much in main- 
taining the right body temperature, because clothes be- 
come damp from wearing, and dampness uses up body 
heat. 
Sunlight — Sunlight is one of the best health bringers 
known. Little children— and grown people, too — suffer- 
ing from the most serious form of tuberculosis, that of 
the bones, get well if they are kept in the sunlight. In 
one of the finest hospitals for children in the world, in 
Switzerland, the main treatment is to have the children 
play outdoors without clothes in the sunlight, and they 
do this even when there is heavy winter snow on the 
ground. Human beings droop and die without the sun, 
just as plants do, though it takes longer to kill them. It 
