Healthy living . he walls of*the well were made of rough stone; andalthough it was quite deep, Edward, the elder boy,who was strong and active, thought he could climbdowm by getting his toes in between the stones andholding on to the old well rope, which was made fastat the top. He had kicked off his shoes when theyounger brother, Robert, had a sudden thought. Waita minute, Ed, he said, let us be sure first that theair is all right. He ran to the house and brought back a candle andsome matches and a long piece of string. The boysfather, who was passing, joined them to see what wasgoing on. He
Healthy living . he walls of*the well were made of rough stone; andalthough it was quite deep, Edward, the elder boy,who was strong and active, thought he could climbdowm by getting his toes in between the stones andholding on to the old well rope, which was made fastat the top. He had kicked off his shoes when theyounger brother, Robert, had a sudden thought. Waita minute, Ed, he said, let us be sure first that theair is all right. He ran to the house and brought back a candle andsome matches and a long piece of string. The boysfather, who was passing, joined them to see what wasgoing on. He helped them cut a groove around thecandle, tie a string in the groove, light the candle, andlet it slowly down into the well. When it was nearlyat the bottom,—all at once the candle went out! ii6 HEALTHY LIVING Well, boys, what does that mean? asked theirfather. Why, it means that there was not enough oxygendown at the bottom of the well to keep the flame burn-ing, cried Robert in excitement, and if Ed had gone. Fig. 49.—The boys and their father let a candle down into the wellto see if there is oxygen enough to keep the flame burning. down, there would not have been enough for him tobreathe and he might have died. Right you are, said his father. There is plentyof oxygen in all ordinary air, even in crowded rooms;but in old wells and cesspools and the lower parts ofmines, where decay is going on, the air sometimes con-tains a great deal of carbon dioxide and not enough BREATHING 117 oxygen to support life. You have studied physiologyto good purpose, Bob, I see, and I will give you a newLeague ball for your good sense and judgment. How the Breathing Movements are Made.—Themachinery by which the breathing movements aremade and the air is drawn into the lungs is one of themost interesting things about the human body. The lungs lie in the chest, in a space bounded on thesides by the ribs and below by a very large musclecalled the diaphragm (see Fig. 9). The diaphragm isshaped
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