12. When a man uses alcohol and tobacco, their effects upon the bones are not so apparent as are the effects upon the blood, the nerves, and other organs; but when the poisonous drugs are used by a growing boy, their damaging influence is very plainly seen. A boy who smokes cigars or cigarettes, or who uses strong alcoholic liquors, is likely to be so stunted that even his bones will not grow of a proper length and he will become dwarfed or deformed.
SUMMARY.
1. To keep the bones healthy they must have plenty of healthful food.
2. The whole-grain preparations furnish the best food for the bones.
3. Walking at too early an age often makes the legs crooked.
4. Hard work at too early an age stunts the growth.
5. Bad positions and tight or poorly-fitting clothing are common causes of flat chests, round shoulders, and other deformities.
6. Tight or high-heeled shoes deform the feet and make the gait awkward.
7. The bones may be easily broken or put out of joint, or the ligaments may be torn by rough play.
8. Alcohol prevents healthy growth.