~4. We should Exercise the Brain.~--What do we do when we want to strengthen our muscles? We make them work hard every day, do we not? The exercise makes them grow large and strong. It is just the same with our brains. If we study hard and learn our lessons well, then our brains grow strong, and study becomes easy. But if we only half study, and do not learn our lessons perfectly, then the study does not do our brains very much good. ~5. We should Take Muscular Exercise.~--When you get tired of study, an hour's play, or exercise of some sort, rests you and makes you feel brighter, so that you can learn more easily. This is because exercise is necessary to make the blood circulate well. It will then carry out the worn-out particles and supply the brain and nerves with fresh, pure blood. So the same exercise which makes our muscles strong makes our brains healthier also. ~6. We should be Careful of our Diet.~--We ought to eat plenty of good, simple food, such as milk, fruits, grains, and vegetables. It is not well for children to eat freely of meat, as it is very stimulating and likely to excite the brain and make the nerves irritable. Mustard, pepper, and all hot sauces and spices have a tendency to injure the brain and nerves. ~7. We should Allow the Brain to Rest at the Proper Time.~--When we are tired and sleepy we cannot think well, and cannot remember what we learn if we try to study. If we have plenty of sleep, free from bad or exciting dreams, we awake in the morning rested and refreshed, because while we have been asleep Nature has put the brain and nerves in good repair for us. We ought not to stay up late at night. We should not eat late or hearty suppers, as this will prevent our sleeping well. ~8. We Ought Not to Allow Ourselves to Become Angry.~--When a person flies into a passion he does his brain and nerves great harm. It is really dangerous to get angry. Persons have dropped dead instantly in a fit of anger. ~9. We should Shun Bad Habits.~--Bad habits are very hard to give up, and hence we should be careful to avoid them. When a child learns to swear, or to use slang phrases, the brain after a while will make him swear or use bad words before he thinks. In a similar manner other bad habits are acquired. SUMMARY. 1. A person without a brain or nerves would be of no more account than a vegetable. 2. When the brain or nerves are sick they cannot perform their duties properly. 3. To keep the brain and nerves in good health, we must take good care of the stomach and all other important organs of the body. 4. There are many things which we may do to keep the brain and nerves strong and well. 5. The brain needs pure blood, and so we must be careful to breathe pure air. 6. The brain gets strength by exercise, just as the muscles do. Hence, study is healthful, and makes the brain strong. 7. A good memory is very necessary, but we should not try to remember everything.