5.  Plenty of Sleep Necessary.—­If we should take a drop of blood from the finger of a person who had not had as much sleep as he needed, and examine it with a microscope, we should find that there were too few of the little red-blood corpuscles.  This is one reason why a person who has not had sufficient sleep looks pale.

6.  Proper Clothing.—­We should be properly clothed, according to the weather.  In cold weather we need very warm clothing.  In warm weather we should wear lighter clothing.  Our clothing should be so arranged that it will keep all parts of the body equally warm, and thus allow the blood to circulate properly.  The feet are apt to be cold, being so far away from the heart, and we should take extra pains to keep them warm and dry.

7.  Effects of Excessive Heat.—­In very hot weather, many persons are injured by exposing themselves to the sun too long at a time.  Persons who drink intoxicating liquors are very often injured in this way, and sometimes die of sunstroke.

8.  Effects of Anger.—­When a person gets very angry, the heart sometimes almost stops beating.  Indeed, persons have died instantly in a fit of passion.  So you see it is dangerous for a person to allow himself to become very angry.

9.  Effects of Alcohol upon the Blood.—­If you should take a drop of blood upon your finger, and put it under the microscope, and then add a little alcohol to it, you would see that the corpuscles would be quickly destroyed.  In a few seconds they would be so shrivelled up that no one could tell that they had ever been the beautiful little corpuscles which are so necessary to health.  When alcohol is taken as a drink, it does not destroy the corpuscles so quickly, but it injures them so that they are not able to do their work of absorbing and carrying oxygen well.  This is one reason why the faces of men who use alcoholic drinks often look so blue.

10.  Alcohol Overworks the Heart.—­Dr. Parkes, a very learned English physician, took the pains to observe carefully the effects of alcohol upon the heart of a soldier who was addicted to the use of liquor.  He counted the beats of the soldier’s pulse when he was sober; and then counted them again when he was using alcohol, and found that when the soldier took a pint of gin a day his heart was obliged to do one fourth more work than it ought to do.

11.  Effects of Alcohol upon the Blood-Vessels.—­If you put your hands into warm water, they soon become red.  This is because the blood-vessels of the skin become enlarged by the heat, so that they hold more blood.  Alcohol causes the blood to come to the surface in the same way.  It is this that causes the flushed cheeks and the red eyes of the drunkard.  Sometimes, after a man has been using alcohol a long time, the blood-vessels of his face remain enlarged all the time.  This makes his nose grow too fast, and so in time it gets too large, and then he has a rum-blossom.