If a young person bends the body forward, he will, after a time, become round-shouldered and his chest will become so flattened that the lungs cannot be well expanded.
[Illustration: DESK TOO HIGH.] ~6.~ Standing on one foot, sitting bent forward when reading or at work, sleeping with the head raised high upon a thick pillow or bolster, are ways in which young persons often grow out of shape.
[Illustration: SEAT TOO HIGH.] ~7.

The Clothing.~--Wearing the clothing tight about the waist often produces serious deformities of the bones of the trunk, and makes the chest so small that the lungs have not room to act properly.

Tight or high-heeled shoes also often deform and injure the feet and make the gait stiff and awkward.
~8.

Broken Bones.~--By rough play or by accident the bones may be broken in two just as you might break a stick.

If the broken parts are placed right, Nature will cement them together and make the bone strong again; but sometimes the bones do not unite, and sometimes they grow together out of proper shape, so that permanent injury is done.
~9.