This restless air-gas cannot be stored outside of the body, any better than it can be inside.

For one thing, it is too bulky; and for another, it begins to become impure in various ways, as soon as it is shut up.

It is the most unmanageable food that we "eat," for we can neither cook it nor wash it like solid food, nor filter it nor boil it like water, except on a very limited scale.

We can do nothing to it except to foul it, which we do with every breath that we breathe, every fire that we make, every factory that we build.
Our only chance of safety, our only hope of life, is to connect every room and every corner of those little brick and mortar boxes, those caged sections of out-of-doors, that we call houses, with nature's great system of air supply, "All Outdoors." Fortunately, the only thing needed to make the connection is to open a window--no need to send for a plumber or put in a meter, and there is no charge for the supply after connections have been made.
The Enormous Amount of Air.

Air outdoors is everywhere, for practical purposes, absolutely pure, just as water is when it comes down from the clouds.