t
both the bottom and the top, or if there are two windows in the room,
both may be opened at the bottom. In moderate weather the openings
should be twice as large. A cap may be worn to keep the head warm, and
the bed should be out of the draft.

=Fresh Air gives Health.=--Four hundred people die of tuberculosis in
our country every day. A few years ago it was thought that no one
could get well of this disease. Now three fourths of those in the
first stages of the disease get well. The chief part of the cure is
fresh air. Medicine is seldom used because no medicine will cure
tuberculosis. Good food and rest are great helps.

Many of those with tuberculosis stay out of doors all day and at night
sleep in tents or with all of the windows wide open, even in the
coldest weather. Snow may blow in and the water in the room may turn
to solid ice, but fresh air, the good angel of health, will give the
body new strength and make it well and strong again.

[Illustration: FIG. 66.--This man is curing himself of tuberculosis by
sleeping at night, and sitting by day, on this porch.]

Many years ago when the Indians lived in tents and often slept
outdoors none of them had this dirty air disease of tuberculosis.
Since they have formed the habit of living in houses nearly one half
of some tribes have become sick with this catching disease.

=Making the Lungs Strong.=--It requires over three quarts of air to
fill your lungs. When you breathe quietly, less than one pint of air
passes in and out of your lungs. This shows that a large part of the
lungs is not used. The air sacs at the top and in the bottom part of
the lungs are seldom filled completely. It is in these places that
disease begins.

Several minutes should be spent two or three times each day in
exercising the lungs. Fill them completely with air many times. _Learn
to breathe deeply while you are walking in the fresh air._ Hold the
head up and the shoulders back so that every part of the lungs can be
filled. _Sit straight. Your life depends upon your lungs._ Give them a
chance to do their work and teach them to do it well.

[Illustration: FIG. 67.--Unhealthful position which squeezes the lungs
so that they cannot work freely.]

=Tobacco and Pure Air.=--There is poison in the smoke of tobacco. This
is shown by its effect on insects. Owners of greenhouses often buy the
stems and other waste parts of tobacco. They pile it in a pan and after
closing the doors and windows