I awaken in the morning, and the first horrible emergency of the day confronts me at once, I have to get up. How I get up I have no idea. Professor James once said that when a man thinks about it he never does get up, and that's right; but I find myself in the middle of the floor and that is all I know, and then the cold air or the sight of my clothes or something reminds me to start dressing, and the putting on of one garment leads to the putting on of another. The pangs of hunger call me to the breakfast table; the bell calls me to work; and so all day long response follows stimulus; the day's work is a success or a failure according to the response which I make to the stimuli which I receive.
There is a marvelous picture given in the scripture in the parable of the poor man going down from Jerusalem to Jericho and getting wounded and left by the road-side. Three men pass that way. They all see the same thing. The light is reflected from the poor sufferer into the eyes of these passers-by; a flood of vibration passes on to the brain and then the motor impulses go out to the muscles. In the case of the good Samaritan, the impulse went from the brain or the spinal nerve to the arms and he stooped down and picked the poor fellow up and carried him off; while in the priest and the Levite the impulses all went down into the legs and the cowards hustled off for Jericho.
A healthy nervous system is the rarest thing in this wide world. I have one illustration in mind, which I always like to think of, which I am going to give you of a perfectly healthy and normal nervous system. It was possessed by a good old negro minister. He had been preaching to his congregation for a long time on the subject of meekness and it had not produced the desired effect; so he said to them one morning: "Brethren, I'se gwine to give you the illustration of meekness for a week now and show you what it is," and the old man did. His congregation naturally rose to the occasion: They insulted his wife; they abused his children; they stoned his dog; they stole his chickens; they did everything under the heaven to break down the meekness of that man; but he went on through the week and came into church the next Sunday and began to preach. The congregation recognized that their time was short and they redoubled their efforts, but all in vain. Finally, about five minutes before the closing of the service, he turned to the congregation and said: "Brethren, I think I ought to denounce to this congregation that my week of meekness is just about up, and when the clock in yonder steeple strikes twelve, I'se gwine to quit preachin', close this blessed Bible, go down from this pulpit, and then, Brethren, Judgment day and hell is gwine to break loose on some of you." Now, that old colored minister had an ideal nervous system. There had not been one single response all that week long, and not one single stimulus which had come in from the outside had been lost either, but it was all waiting to leap into that good right arm when the emergency was to be met, in the fullness of time, and I commend you to go and do likewise.
It is only a step, thank fortune, from the ridiculous to the sublime, just as it is only a step from the sublime to the ridiculous. Another illustration of a perfect nervous system: You remember how our Lord spent a whole day in preaching, in healing, working deeds of kindness, in pouring out sympathy and comfort, the strain of which on a man's nervous energy is worse than anything else in the world, and how at the close of the day He went into the little boat, took the hard cushion on which the steersman sat, threw it down in the bottom of the boat, and laid Himself down with His head on that hard cushion and slept like a child through the rocking of the boat and the roaring of the storm, until His disciples came to Him saying, "Lord, save us: we perish." There is not one man in a thousand who could do that work or could put out one-tenth part of that nervous energy and then sleep like that. Anybody who thinks that the Prophet of Nazareth was a weak or a feeble man has made the mistake of his life. He was perfect physically or He never could have done His work.
All this work of developing a steady nerve, of developing the vital organs for the use of the muscles, has been going on until the child is nine or ten years old. It has been going on very rapidly, and in as much as the exercise has been suitable, as his digestion has been good, his growth has been very rapid. During the first three years of its life the child increases its weight more than three-fold. During the next three years it adds over forty per cent. to this amount and between six and nine adds over thirty per cent. more; and when the boy is about eleven years old, or the girl is about ten, then the growth almost stops that year. It drops to a minimum. I call your attention to this thought: the minimum growth is more in a girl than in a boy. A girl is always more precocious than a boy. She is a year older than he at nine or ten, and when she is fourteen, fifteen, sixteen, she is two years older than the boy. When the girl is ten and the boy eleven, growth drops to the minimum. Why is that? Nature is economizing her material and husbanding her resources against the trying years which are to come.
You remember the story of the time when Pharoah in his dream saw the seven fat kine followed and devoured by the seven lean kine; he was told that his dream signified seven years of plenty, to be followed by seven years of famine, and was advised to store up the harvests of the good years against the hard times to follow. This is a picture of the child's life. The first seven years of the child's life are years of plenty, when it is storing up material for the years of hard trial, the years of famine, which are close at hand.
I am going to talk most of the girl because she needs more attention than the boy. Growth is a very expensive process. It begins in the bone. When the bones lengthen out, then every muscle, every nerve has to be lengthened out to suit that extra length, and that means a great deal of waste for that rebuilding, but it is something worse than that. You know perfectly well that out of the butterfly egg there comes the caterpillar, and that caterpillar goes into a cocoon, and during the life of the cocoon every organ is changed there and it comes out a butterfly. That is what we call a metamorphosis.
The girl between ten and sixteen is undergoing a metamorphosis just as sure as that caterpillar is undergoing a metamorphosis. If you leave town for a few years and come back, you know all the old men and women haven't changed any, except to die off. The babies have grown some; but the boy and the girl seem to be grown all over again. That is, the girl whom you left at nine years old and on coming back find her sixteen, has dropped down her skirts, has drawn up her hair, and that is the butterfly cocoon, and it is a mighty pretty butterfly cocoon. That is waste again. It is waste, waste, on all sides and all of that waste is going into the blood, no other place to put it; it ought to be got out at once. But there is another thing about it; all the food must be digested, and so oxygen must be gained and waste must be eliminated. All the organs in the trunk between those ages of ten and fourteen are relatively both larger and smaller in girls than at any other period of life.
It looks as though Nature was making a bad blunder, but she is really making the best of a very bad bargain, doing the best she can under hard circumstances. With these small vital organs and this tremendous draught on the body for new material and the large amount of waste to be eliminated, you are sure to have trouble. That trouble is going to manifest itself first of all in the blood. The blood is going to be poor blood during those years, unless you remedy it. Poor blood, first of all, depresses the nervous system, and the girl feels gloomy and good for nothing; she hates to go out into the cold air because she chills; yet that cold air is what she needs more than anything else in the world. She hates to make an effort and won't take the exercise she needs if she can possibly help it. The exercise she must have. Her appetite has gone all wrong. She likes to live on caramels, pickles, and all such things as that. Now, my friends, I want to tell you, when anything goes wrong with the appetite, then the whole system goes wrong, remember that. Observations were made some years ago in Sweden of a number of the bodily disorders that occur between the ages of thirteen and nineteen. These examiners found that there was one disorder which attacked, put in general numbers, sixty per cent. of the girls in the Swedish schools between the ages of thirteen and nineteen, and, indeed, it never fell below sixty per cent. and was usually a great deal more. In Denmark, the examination was made in the field where the children are healthier, and then the figures gave forty per cent. The troubles usually show themselves in the form of pallor; the girl is pale. They frequently break out in the form of headache, loss of appetite, resistance to marked effort and sometimes with a cold. Now, if the seat of the cold is in the blood, because it is loaded with waste and ought to be removed, there is one thing sure, that waste never will be removed until it is thoroughly oxidized. That is the first thing to do, oxidize it. The only way to oxidize the blood is to get the lungs full of good, pure air.
The girl wants just as much lung capacity as she can possibly get. We find that the girl during those years is a little taller and a little heavier than the boy, and she needs more oxygen to every pound of waste in the body than the boy does, because the waste is going on faster. The average girl has about three-fourths as much lung capacity for every pound of the waste in the body, as has the average boy. What the girl needs is more lung capacity to get in more oxygen. How is she going to get the lung capacity sitting in the house? How is she going to get it when she is tied down in the grammar school room with a book before her eyes?