1. Why do we need a system of nerves? 2. What do we mean by motor nerves? by sensory nerves? 3. How is the central system like a telephone office? 4. What does the word ganglion mean to you? 5. What are the ganglions (ganglia) for? 6. Is the brain a ganglion? 7. Give a rough idea of the structure of the brain, and name its parts or divisions. 8. What does each one of these divisions do? 9. What is the result of injury to any one of these parts? Give an instance. 10. Where do we find the gray matter in the nervous system? 11. What is the white matter and what does it do? 12. When the thumb is paralyzed, what do we know about the brain? 13. Where in the body do we really smell, hear, and see? 14. What do we know about the speech centre? 15. Draw a picture of the spinal cord and its branches. 16. Of what use are the ganglia (gray matter) in the spinal cord? Give an example. 17. Why is it that some children can't help wriggling when tickled? 18. Why is the medulla such an important part of the nervous system? 19. When you touch a hot lamp chimney, what happens in your nervous system? 20. Suppose you had seen some tempting fruit, what would have happened in your nervous system and in your digestive system? 21. What does the brain do with the messages from the eyes, ears, and nose? 22. How does the message-and-answer system protect the body? 23. How does it help us to gain knowledge? 24. Why is it that when two people look at the same thing at the same time they may have very different ideas of what it is? CHAPTER XXI 1. Describe the arches of the feet and tell what they are for. 2. Describe the kind of shoe you ought to wear. 3. Do you grow while asleep? 4. How much sleep do you need? 5. Are there many diseases of the muscles and bones? 6. How does nature repair a broken bone? 7. What causes most of the diseases of bones? 8. What is a slouching gait due to? 9. What is the cause of headache? 10. How should headache be regarded and treated? 11. What are the dangers of taking patent or unknown medicines? 12. What do most patent medicines contain? 13. Are the nerves resistant to disease, or specially subject to its attack? 14. What causes many of the diseases of the nerves? 15. Name some poisons that injure the nerves. 16. How may diphtheria affect the nerves? 17. What does alcohol do to the nervous system? 18. Does our modern method of life tend to cause or to cure nervous diseases and insanity? Why? CHAPTER XXII