mouth, into the
atmosphere."

What do you mean by contracts?--"Becomes smaller."

What do you mean by atmosphere?--"The air."

Of what use is the air when it is in the lungs?--"It makes the blood pure."

Why can you not live without breathing?--"Because, if I do not breathe,
pure air cannot get into the lungs to make the bad blood pure, and I cannot
live if the dark, impure blood is sent back again through my body."

Why must you live in the sunlight?--"Because the sunlight helps to purify
the blood and strengthen the body."

Why must you wear loose clothing?--"Because tight clothing stops the
circulation of the blood."

Why must you avoid tight-lacing?--"Because tight-lacing crowds the ribs
against the lungs, so that the lungs cannot move freely."

Why should you wear clean clothing?--"That nothing impure may pass into the
body through the pores of the skin."

Why should you keep the body clean?--"That the pores of the skin may not be
closed, but remain open to let the perspiration pass through."

What has the cleanliness of the body to do with the health of the
lungs?--"If the body is not kept clean, the perspiratory pores become
clogged."

What happens when the perspiratory pores are clogged?--"The impure
particles which should pass through them stay in the body, and cause
disease in the lungs or other parts."

Why should you sit and stand erect?--"Because, if I am in the habit of
stooping, my lungs will be crowded, and will not have enough room to move
freely."

Why should you keep all parts of the body warm?--"Because chilling any part
of the body causes the blood to chill in that part, and thus hinders its
circulation."

Why should you not change your winter clothing too early in the spring of
the year?--"I may take cold if not warmly clothed during the cool days of
early spring."

Why should you avoid draughts of cool air?--"Because the cool air blows
upon some parts of the body and closes the pores of the skin, checking the
perspiration, and hindering the circulation of the blood."

Why should you not rush suddenly from a warm to a cool place?--"Because
when warm the pores of the skin are open; if I rush suddenly into the cool
air, these pores are closed too quickly."

Why does stopping the perspiration hurt the lungs more or less?--"The
impurities it ought to carry away remain in the body, make the blood
impure, and produce disease in some part; very often that part is the
lungs."

What