Do you not think it very wrong for a person to give to another through carelessness a disease which may cause his death?
~5.~ Unhealthful vapors and odors of various sorts arise from cisterns and damp, close places under a house.

Rooms which are shaded and shut up so closely that fresh air and sunshine seldom get into them should be avoided as dangerous to health.
~6.

Breath-Poisoned Air.~--The most dangerous of all the poisons to which we are exposed through the air are those of the breath, of which we learned in a preceding lesson.

We need plenty of fresh air to take the place of the air which we poison by our breath.

Every time we breathe, we spoil at least _half a barrelful of air_.