and pulpy before it can burn in your muscles. Now you can guess what your teeth are for. They chop, crush, and grind the food; and the tongue rolls it over and over and mixes it with the moisture in your mouth, until it is almost like very thick soup. Then you make a little motion with your tongue and throat, and down it goes.

THE FOOD TUBE

Note the arrows. This is the trip made by every mouthful of food.

Where does it go? It is passed down a tube that we call the food tube. While I tell you about it, you can look at the picture and then try to draw it yourself.

The food goes quickly down the first part of the tube until it comes to a part much larger than the rest, which we call the stomach. Here it is churned about for a long time, and the meat you have eaten is melted, or dissolved. Then the food goes on into the next part of the tube, which has become narrow again. This lower part, which is about twenty-five feet long, is coiled up just below the waist, between the large bones that you can feel on each side of your body. These coils of the food tube, we call the bowels.

Winding all around the stomach and bowels are tiny branching pipes full of blood. They look somewhat like the creepers on ivy, or the tendrils on grapevines. These suck out the melted food from the bowels. They take what the body can use, and carry it away in the blood to all parts of the body. This is the fuel that keeps the “body fires” going. The tougher parts of the food, which the body cannot use, are carried down to the lower end of the bowels and pushed out by strong muscles.

This waste should be passed out from the body once every day and at the same time each day. In the morning after breakfast is perhaps the best time. If you do not get rid of it every day, it makes poisons, which go into your blood and soon make you very sick indeed. You must keep clean inside as well as outside.

GOING TO SCHOOL

I. GETTING READY

As soon as you have finished breakfast, and brushed your teeth and gone to the toilet, you are ready to run out of doors to play, if you have plenty of time, or, if not, to start for school.

Doesn’t it seem a nuisance, in winter time, to have to put on a coat and overshoes and a cap or a hood, and sometimes leggings and mittens, too? But your mothers know what is best for you; and when you are young and growing fast, you have so much more surface in proportion to your weight than when you are grown up, that you lose heat from the blood in your skin very fast; and unless you are warmly dressed, you become chilled.

When you are chilled, you are using up, in merely trying to keep yourself warm, some of the energy that ought to be used for growing and for working. It has been found out by careful tests that children who are not warmly dressed, and particularly whose arms and legs are not warmly covered, do not grow so fast as they ought to, and more easily catch colds and other infections. So take time to put on your cap and your coat, if the weather is cold; and, if it is snowy, to button on leggings over your stockings; and then you can play as hard as you like, and run through the snow, and keep warm and rosy and comfortable.

Wool is one of the best stuffs for coats and dresses and stockings and gloves and caps, not only because it is warm, but also because it is lighter in weight than anything else you could wear that would be equally warm, and because it is porous; that is, it will let the air pass through it, and the perspiration from the body escape through it.

Don’t wear any clothes so tight that you cannot run and jump and play and fling your arms and legs about freely, or so fine and stylish that you are afraid of getting them soiled by romping and tumbling.

It is best to wear fairly heavy, comfortable shoes with good thick soles; then you will not have to wear rubbers, except when it is actually pouring rain, or when there is melting snow or slush upon the ground. Felt, or buckskin, or heavy cloth makes very good “uppers” for children’s shoes; but only leather makes good soles.

It is best not to wear rubbers too much, because the same waterproofness, which keeps the rain and the snow out, keeps the perspiration of your feet in, and is likely to make them damp. When they are damp, they are as easily chilled as if they had been wet through with rain or puddle water. Always take off your rubbers in the house or in school, because they are holding in not only the water of perspiration, but the poisons as well; and these will poison your entire blood, so that you soon have a headache and feel generally uncomfortable.

II. AN EARLY ROMP

The minute you are outside the door, the fresh morning air strikes your face, and you draw four or five big breaths, as if you would like to fill yourself as full as you could hold. If you have had a good night’s sleep and a good breakfast, the very feel of the outdoor air will make you want to run and jump and shout and throw your arms about. This warms you up finely and gives you a good color; but if you keep it up long, you will notice that two things are happening: one, that you are breathing faster than you were before; the other, that your heart is beating harder and faster, so that you can almost feel it throbbing without putting your hand on your chest.

If you run too hard, or too far, you begin to be out of breath, and your heart thumps so hard that it almost hurts. What is your heart doing? It is pumping; it is trying to pump the blood fast out to your muscles to give them the strength to run with.