With only undiluted oxygen
to breathe, the tissues would dry and shrivel, fuel burn with a fury none
could withstand, and every operation of nature be conducted with such
energy as soon to exhaust and destroy all power. But "a mixture of the
fiery oxygen and inert nitrogen gives us the golden mean. The oxygen now
quietly burns the fuel in our stoves, and keeps us warm; combines with the
oil in our lamps, and gives us light; corrodes our bodies, and gives us
strength; cleanses the air, and keeps it fresh and invigorating; sweetens
foul water, and makes it wholesome; works all around us and within us a
constant miracle, yet with such delicacy and quietness, we never perceive
or think of it, until we see it with the eye of science."
Food and air are the two means by which bodies live. In the full-grown
man, whose weight will average about one hundred and fifty-four pounds,
one hundred and eleven pounds is oxygen drawn from the air we breathe.
Only when food has been dissolved in the stomach, absorbed at last into
the blood, and by means of circulation brought into contact with the
oxygen of the air taken into our lungs, can it begin to really feed and
nourish the body; so that the lungs may, after all, be regarded as the
true stomach, the other being not much more than the food-receptacle.
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