Excerpt from Bad Air and Bad Health
The purpose of this paper is to utter a warning against the careless way in which the mass of people, poor and rich, ignorant and learned, allow the air of their living-rooms to be in an impure condition; and to point out the great sacrifice of energy and health which results from this carelessness. We shall try to show that there is a strong ground for believing that not only a large part of the ever-increasing trouble of bronchial and lung affections, but also a very large part of that vague and subtle ill-health, which troubles our modern lives in varying forms, are to be placed to the account of the impure air which we so habitually breathe.
As we wish to make the paper plain to every one, we shall occasionally go back to the A B C of certain matters involved. The air which we breathe is made up of two gases, one active, one indifferent. The active gas, oxygen, on which life depends, is in pure air in the proportion of about one-fifth (nearly 21 per cent.) of the whole; the indifferent gas, nitrogen, which tempers and dilutes its active partner, is in the proportion of four-fifths (just over 79 per cent.), and with these two gases is found a small quantity - continually varying according to circumstances - of carbonic acid, about three to four parts in 10,000 parts, or .04 per cent., and in addition a minute quantity of a peculiarly active form of oxygen, called ozone, which is said to be rarely found in the air of towns. Of this gas-mixture (which we call air) we breathe enormous quantities. Of it we breathe in the twenty-four hours, according to Professor M. Foster, over 2600 gallons, that is about 425 cubic feet.
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