What are the uses of the bones?
What is a joint?
What is cartilage?
By what are the bones held together?
Of what are the bones largely composed?
CHAPTER XIX.

HOW TO KEEP THE BONES HEALTHY .-- What sort of bread is best for the bones?
Why?
If a child tries to walk too early why are its legs likely to become crooked?
What are the effects of sitting or lying in bad positions?
Of wearing tight or poorly-fitting clothing?
Of tight or high-heeled shoes?
What injuries are likely to happen to the bones and joints by accident or rough play?
CHAPTER XX.

THE MUSCLES AND HOW WE USE THEM .-- How many muscles in the body?
Of what are the muscles composed?
How are many of the muscles connected to the bones?
To what are all bodily movements due?
How do the muscles act?
What causes the muscles to act?
Do all muscles act only when we will to have them act?
CHAPTER XXI.

HOW TO KEEP THE MUSCLES HEALTHY .-- What makes the right arm of the blacksmith stronger than the left one?
How should exercise be taken?
Mention some things in relation to the use of the muscles which we ought not to do, and state the reasons why.

What is the effect of alcohol upon the muscles?
of tobacco?
of tea and coffee?
CHAPTER XXII.