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Updated: May 31, 2025
Now, we say that the little vesicles of which this cloud was composed arose from the condensation of water-vapor preexisting in the atmosphere, through reduction of temperature; we show how they assumed the form they present.
Air entering the lungs in ordinary breathing parts with about five per cent of itself in the form of oxygen and receives about four and one half per cent of carbon dioxide, considerable water-vapor, and a small amount of other impurities. These changes suggest a twofold purpose for respiration: 1. To obtain from the atmosphere the supply of oxygen needed by the body.
Suppose that a few years ago you had asked some chemist, "What are the constituents of the atmosphere?" He would have responded, with entire confidence, "Oxygen and nitrogen chiefly, with a certain amount of water-vapor and of carbonic-acid gas and a trace of ammonia."
To relieve the atmosphere of the gases and vapors proceeding from combustion is, of course, the purpose of ventilation. The sulphuric acid gas and ammonia will be largely in combination with the water-vapor, which also proceeds from combustion, so that all will be got rid of together.
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