5. To keep the ear healthy we must avoid meddling with it or putting
things into it.

6. The eye is the organ of sight. The chief parts of the eye are the
eyeball, the socket, and the eyelids.

7. In the eyeball are the pupil, the lens, and the nerve of sight.

8. The eyeball is moved in various directions by six small muscles.

9. The eye is moistened by tears from the tear-gland.

10. When we look at an object the lens of the eye makes a picture on the
nerve of sight, at the back part of the eyeball.

11. To keep the eyes healthy we should be careful not to tax them long
at a time with fine work, or to use them in a poor light.

12. The nerves of smell are placed in the upper part of the inside of
the nose.

13. "Colds" often destroy the sense of smell.

14. The nerves of taste are placed in the tongue and palate.

15. Many things which we think we taste we really do not taste, but
smell or feel.

16. Objects which have a pleasant taste are usually healthful, while