Abstract
The importance of the role played by oxygen in the human system has no parallel among the other substances required for the healthy maintenance of the body and its functions. A man may live a month without food, a week without water, but dies in a few minutes when deprived of oxygen. Oxygen is the vitalizing agent of animal and vegetable life. It aids both in building up and in tearing down those complex molecular compounds which characterize all living forms. The intensity of the life which an animal lives, is in exact proportion to the amount of oxygen which it breathes. The sluggish life of the frog is the natural result of its imperfect breathing apparatus, just as the astonishing activity of the humming bird is rendered possible by the-perfection of the respiratory system. The reception into the body of an increased amount of oxygen means an increased amount
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