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Updated: May 5, 2025
It will be found that some houses are shut up as tightly as possible and that only a few are properly ventilated. A person who insists on keeping his window open in winter is often looked upon as a freak. What is the result of this close housing? The first result is that the blood is unable to obtain the required amount of oxygen and is poisoned by the rebreathing of the air in the room.
And still, as if to avoid the possibility of evil to man on this account, the beneficent Creator has wisely so ordered, that while we do not interfere with the laws of Nature, there is not even the possibility of rebreathing respired air until it has been purified and restored to its natural and healthful state; for carbonic acid, the vitiating product of respiration, although immediately fatal to animals, constitutes the very life of vegetation.
It does not take long before the air in a closed, occupied room is so heavily charged with this gas and so poor in oxygen that its constant rebreathing is detrimental. The blood stream becomes poisoned, which immediately depresses the physical and mental powers. Warning is often given by a feeling of languor and perhaps a slight headache.
The air which is breathed becomes so rapidly impure, that a constant supply of fresh air must be kept up to make the air of the shut-up space fit for breathing. The following are some amounts of space per head which are met with in practice: Shut up a mouse in a glass receiver, and it will gradually die by rebreathing its own breath.
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