THE INDISPENSABILITY OF OXYGEN
Sunlight is the basis of all life. It is sunlight which plants absorb, and which they transform into materials which go to make up the living tissues of all things. The place of breathing in the process of life is manifold. But its primary function is to make available for the body’s uses the sunlight, or energy, which is stored up in the food we eat. It does this by means of the oxygen which it contains, and the purpose of breathing is to obtain from the air an adequate supply of oxygen. Oxygen is one of the essential materials required for the support of life. Without oxygen the whole life process would come to an end. From every breath that is taken into the body, about one and a quarter cubic inches of oxygen must be obtained by the body, to keep up the fire of life within us. You cannot burn a match, or your reading lamp in the evening, unless there is an adequate supply of oxygen; and even so does the body require this indispensable and all powerful element in order to maintain itself.
Fresh Air in Bermuda
We have noted the fact that of the myriads upon myriads of swarming cells which the blood contains, a large proportion are the oxygen-conveyers. When you take air into your lungs, these cells absorb the precious element, and rush with it to all parts of the body. After distributing the oxygen wherever it is needed, they pick up for the return journey to the lungs all manner of débris and gases—the poisons which are produced by the organs of the body as they carry on their work. As Metchnikoff has shown us, it is the accumulation of poisons produced by the activity of our various organs which, unless properly disposed of, or kept below excessive quantities, bring about premature old age, the majority of all diseases, and early death. The amount of poisons which the average person throws off from the body with a single breath, as has been shown by delicate laboratory experiments, is enough to contaminate and render unfit for breathing three cubic feet or three-quarters of a barrel of air. Assuming an average of twenty breaths per minute, which is the normal rate for breathing for adults, the amount of air each person contaminates per minute will be sixty cubic feet, or one cubic foot a second.
If you hold your breath for a minute, you will be conscious of an extremely unpleasant feeling, which is the way in which the body manifests its urgent need for oxygen. The need of ventilation is not merely the need of oxygen, however. There may be plenty of oxygen in the air of a room which has been closed for some time, and which has been breathed in and out of the lungs of the people in the room; the trouble is that this oxygen is unfit for breathing, being full of impurities thrown off by the bodies of these people.