Air which goes this way is warmed, cleansed, and moistened, but
that which is breathed directly through the mouth is not so well prepared
for its work in the lungs.
Do not use your mouth as a box or a pin-cushion; the pin, or whatever yon
have put into it, may slip into your throat and cause your death.
* * * * *
QUESTIONS ON THE INTRODUCTORY LESSONS.
Of what is the body built?--"Of bones."
What covers the bones?--"Flesh."
What covers the flesh?--"Skin."
What flows through the body?--"Blood."
Where does the blood flow from?--"The heart."
When does the blood flow from the heart?--"Every time the heart beats."
Show with your hand how the heart beats.
When does the heart beat?--"All the time."
What happens when the heart stops beating?--"We die."
What do you see on the back of your hand, beneath the skin?--"Veins"
What is in the veins?--"Bad blood."
What are the veins?--"Pipes for the bad blood to pass through."
Where do the veins carry the bad blood?--"To the heart."
Where does the heart send the bad blood?--"To the lungs."
What happens to the bad blood when in the lungs?--"It is made pure."
What makes the bad blood pure?--"The air.
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