It puts his nerves to sleep very much as alcohol does, and helps him to be contented with what ought not to content him. A boy who smokes or chews tobacco, is not so good a scholar as if he did not use the poison. He can not remember his lessons so well. Usually, too, he is not so polite, nor so good a boy as he otherwise would be. REVIEW QUESTIONS. 1. How do the muscles know when to move? 2. What part of you is it that thinks? 3. What are the nerves? 4. Where is the spinal cord? 5. What message goes to the brain when you put your finger on a hot stove? 6. What message comes back from the brain to the finger? 7. What is meant by "As quick as thought"? 8. Name some of the muscles which work without needing our thought. 9. What keeps them at work? 10. Why do not the nerve messages get mixed and confused? 11. Why could you not feel, if you had no nerves? 12. State some ways in which the nerves give us pain. 13. State some ways in which they give us pleasure. 14. What part of us has the most work to do? 15. How must we keep the brain strong and well? 16. What does alcohol do to the nerves and brain? 17. Why does not a drunken man know what he is about? 18. What causes most of the accidents we read of? 19. Why could not the man who had been drinking tell the difference between a railroad track and a place of safety? 20. How does the frequent drinking of a little liquor affect the body? 21. How does sickness affect people who often drink these liquors? 22. When a man is taken to the hospital, what questions does the doctor ask? 23. What depends upon his answers? 24. Why do many men use tobacco? 25. How does it make them feel better? 26. Does it really help a person who uses it? 27. Does tobacco help a boy to be a good scholar? 28. How does it affect his manners? [Illustration: _Bones of the human body._] CHAPTER IV. WHAT IS ALCOHOL? [Illustration: R]IPE grapes are full of juice. This juice is mostly water, sweetened with a sugar of its own. It is flavored with something which makes us know, the moment we taste it, that it is grape-juice, and not cherry-juice or plum-juice. Apples also contain water, sugar, and apple flavor; and cherries contain water, sugar, and cherry flavor. The same is true of other fruits. They all, when ripe, have the water and the sugar; and each has a flavor of its own. Ripe grapes are sometimes gathered and put into great tubs called vats. In these the juice is squeezed out.