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Updated: June 26, 2025
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."
The leaves contain a material known as chlorophyll, which, in the presence of light and heat, changes mineral substances into plant food. Chlorophyll gives the leaves their green color. The cells of the plant that are rich in chlorophyll have the power to convert carbonic-acid gas into carbon and oxygen.
In many of these caves there is an accumulation of carbonic-acid gas sufficient to destroy animal life. This is especially true of the latter cave. We now journey by coach to Norris Geyser Basin. On the route we pass by Obsidian Cliff, sometimes called Obsidian Mountain, which is an immense mass of black volcanic glass. This mineral was used by the Indians for making arrow-heads and spear-heads.
It was heavy, this vapour, heavier than the densest smoke, so that, after the first tumultuous uprush and outflow of its impact, it sank down through the air and poured over the ground in a manner rather liquid than gaseous, abandoning the hills, and streaming into the valleys and ditches and watercourses even as I have heard the carbonic-acid gas that pours from volcanic clefts is wont to do.
The yeast that is added to the flour changes some of the starch into sugar and transforms the sugar into alcohol and carbonic-acid gas. This gas, which is lighter than the dough, rises, and in its efforts to escape expands the elastic, glutinous dough into a mass of bubbles with thin walls until the dough is two or three times its original bulk.
Some fifty years since, when the kinetic theory was in its infancy, Faraday liquefied carbonic-acid gas, among others, and the experiments thus inaugurated have been extended by numerous more recent investigators, notably by Cailletet in Switzerland, by Pictet in France, and by Dr. Thomas. Andrews and Professor James Dewar in England.
And think too of the serious old men to whom such things are so completely a matter of indifference, that they are wearing their everyday black coats; the long-married men, whose faces betray their sad experience of the life the young pair are but just entering on; and the lighter elements, present as carbonic-acid gas is in champagne; and the envious girls, the women absorbed in wondering if their dress is a success, the poor relations whose parsimonious "get-up" contrasts with that of the officials in uniform; and the greedy ones, thinking only of the supper; and the gamblers, thinking only of cards.
Huxley gives, as a result of chemical analyses, the following table of ratio of carbonic-acid gas in the atmosphere at the points named: In addition to the consumption of oxygen and production of carbonic acid by the use of common gas, the gas itself, owing to defectiveness of the burner, is projected into the air.
They have been through high-school and college training, they have learned the properties of oxygen, nitrogen, and carbonic-acid gas, and have seen a mouse die under an exhausted receiver, and of course they know that foul, unventilated rooms are bad for the health; and yet generation after generation of men so taught and trained will spend the greater part of their lives in rooms notorious for their close and impure air, without so much as an attempt to remedy the evil.
Thus carbonic-acid gas, as it is commonly called, is made up of an aggregation of molecules, each composed of one atom of carbon and two of oxygen; water, of two atoms of hydrogen and one of oxygen; ordinary iron oxide, of two atoms of iron and three of oxygen.
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