Much smoking of tobacco may hurt the nerve of sight and in a few cases it has made men blind. Many boys have weakened their eyes by the use of cigarettes.
PRACTICAL QUESTIONS
1. Name the chief sense organs.
2. Of what use are the eyelids and tears?
3. Name four parts of the eyeball.
4. What is the iris?
5. Of what use is the lens?
6. What moves the eyeball?
7. When do children get weak eyes?
8. How are the eyes often hurt?
9. How may poor eyes be helped?
10. What makes the eyes sore?
11. How do germs get into the eyes?
12. Name the three parts of the ear.
13. What does the inner ear contain?
14. What may result from neglecting a sick ear?
15. Of what use is smell?
16. Why should food be well chewed?
17. In what part of the skin are most of the nerve endings?
18. What effect does tobacco have on the sense of taste?
CHAPTER XXIII
KEEPING AWAY SICKNESS
Too Much Sickness.—Many diseases are caused by our own carelessness and our bad habits of living. We have about one doctor for every one hundred families. There are enough people sick every day to make a city as large as New York or to equal the number of people living in the thirteen states of Idaho, Nevada, Wyoming, Arizona, New Mexico, Utah, Delaware, Montana, Vermont, New Hampshire, North Dakota and South Dakota, and Oklahoma.
A careful study of disease and its cause shows that at least one half of all the sickness in our land can be avoided by right living.
The Cause of Sickness.—Some people are so foolish as to make themselves sick. They weaken the body by using much beer or wine, by breathing bad air, by lack of exercise, or by fast eating. When the body becomes weak, it is likely to get sick at any time.