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This eBook from the Gutenberg Project consists of approximately 124 pages of information about First Book in Physiology and Hygiene.

19. Wise physicians will tell you that one reason why tobacco is bad for boys is that it hurts their brains so that they cannot learn well, and do not become as useful and successful men as they might be.

20. Students in the naval and military schools of this country are not allowed to use tobacco on account of its bad effects upon the mind.  In France the use of tobacco is forbidden to all students in the public schools.

21.  Tobacco Leads to Vice.—­Boys who use tobacco are more liable to get into company with boys who have other bad habits, and so are apt to become bad in many other ways.  The use of tobacco often makes men want strong drink, and thus leads to drunkenness.  If you wish to grow up with a steady hand, a strong heart, and a good character you will never touch tobacco.

22.  Effects of Tea and Coffee on the Nerves.—­People who use strong tea and coffee are often inclined to be nervous.  This shows that strong tea and coffee, like alcohol and tobacco, are very injurious to the nerves.

23.  Opium, Chloral, etc.—­There are several drugs which are given by physicians to relieve pain or to produce sleep.  They are sometimes helpful, but their use is very dangerous.  Opium and chloral belong to this class of medicines.  The danger is that, after a person has used the medicine a little while, he will continue to use it.  If a person takes a poisonous drug every time he has a little pain, he will soon form the habit of using it, and may never break it off.  There are many thousands of people who use opium all the time, and they are very much injured by it in mind and body.  The mind becomes dull and stupid and the body weak and feeble.  No medicine of this sort should ever be taken unless prescribed by a physician.

SUMMARY.

1.  In order to be well and useful we must keep the brain and nerves healthy.

2.  To keep the brain healthy we need plenty of pure air to breathe; proper exercise of the brain by study; sufficient exercise of the muscles in play and work; plenty of good food to make pure blood; a proper amount of rest and sleep.

3.  There are several things we ought not to do.  We should not read or study too much.  We should not allow ourselves to become excited or angry.  We should avoid learning bad habits.

4.  Alcohol paralyzes the brain and nerves.

5.  Alcohol deceives a person who takes it by making him feel strong when he is weak; warm when he is cold; rich when he is poor; well when he is sick.

6.  Alcohol makes men wicked.  Most men who commit crimes are men who use liquor.

7.  The effects of tobacco upon the brain and nerves are much the same as those of alcohol.  Tobacco is very injurious to the mind.

8.  Tobacco-using often leads boys to drunkenness and other vices.

9.  The use of opium and chloral produces even worse effects than the use of alcohol or tobacco.

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