What harm does it do to the air-cells?--"It hardens the walls of the
air-cells of the lungs."

What harm is done by the hardening of these air-cells?--"1. The lungs
cannot take in enough of the gas called oxygen to purify the blood
perfectly. 2. The gases or vapors in the lungs cannot pass freely through
the hardened air-cells."

What happens from this?--"The lungs become diseased."

From what disease do some hard drinkers suffer?--"Alcoholic consumption,
for which there is no cure." See Appendices on Alcohol and Tobacco.

* * * * *

[Illustration: THE DIGESTIVE ORGANS.]

1. The upper jaw.
2. The lower jaw.
3. The tongue.
4. The roof of the mouth.
5. The food-pipe.
6. The windpipe.
7, 8. Where the saliva is made.
9. The stomach.
10. The liver.
11. Where the bile is made.
12. The duct through which the bile passes to the small intestine.
13. The upper part of the small intestine.