ould make them weak and tottering,
instead of strong and steady?

It would he had enough if you should repair your house with poor
materials; but surely it must be built in the first place with the best
you can get.

You will soon learn that boys and girls are building their bodies, day
after day, until at last they reach full size.

Afterward, they must be repaired as fast as they wear out.

It would be foolish to build any part in a way to make it weaker than
need be.

Wise doctors have said that the boy who uses tobacco while he is
growing, makes every part of his body less strong than it otherwise
would be. Even his bones will not grow so well.

Boys who smoke can not become such large, fine-looking men as they would
if they did not smoke.

Cigarettes are small, but they are very poisonous. Chewing tobacco is a
worse and more filthy habit even than smoking. The frequent spitting it
causes is disgusting to others and hurts the health of the chewer.
Tobacco in any form is a great enemy to youth. It stunts the growth,
hurts the mind, and cripples in every way the boy or girl who uses it.

Not that it does all this to every youth who smokes, but it is always
true that no boy of seven to fourteen can begin to smoke or chew and
have so fine a body and mind when he is twenty-one years old as he would
have had if he had never used tobacco. If you want to be strong and well
men and women, do not use tobacco in any form.

REVIEW QUESTIONS.

1. What two kinds of joints have you?

2. Describe each kind.

3. Find as many of each kind as you can.

4. How are the joints kept moist?

5. How many bones are there in your whole body?

6. Count the bones in your hand.

7. Of how many bones is your spine made?

8. Why could you not use it so well if it were all
in one piece?

9. What is the use of the little cushions between
the bones of the spine?

10. How many ribs have you?

11. Where are they?

12. Where are the shoulder-blades?

13. Where are the collar-bones?

14. What are bones made of?

15. How can we show this?

16. What is the difference between the bones of
children and the bones of old people?

17. Why do children's bones bend easily?

18. Tell the story of the lame lady.