It would disgust the reader if I should enter into the details of telling
him what people--respectable people, even, in nice houses--breathe over.
Air is life. The purer the air, the purer the life-stream that courses
through our hearts. You cannot get too much of it. Take it in freely. Have
only pure air in your houses, in your sleeping-rooms and cellars.
Particularly see that the children have the freedom of the air, day and
night, at home, at school, everywhere. It is free--costs nothing!