It is this which makes the bones so hard and firm that they do not bend by the weight of the body.

When we are young, the bones have less of this bone-earth, and so they bend easily, and readily get out of shape.

When we get old, they contain so much bone-earth that they become more brittle, and often break very easily.
~20.~ A person's height depends upon the length of his bones.

The use of alcohol and tobacco by a growing boy has a tendency to stunt the growth of his bones, so that they do not develop as they should.
SUMMARY.
1.

There are about two hundred bones in the body.
2.