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This is how it comes about: In proportion as the blood loses its oxygen, it picks up in exchange the carbonic acid produced by combustion, so that it is quite loaded with it by the time it returns to the lungs.
Prominent among such processes is that of an interchange of gases between the living being and its environment. This process consists in an absorption of oxygen and a giving-out of carbonic acid, which exchange is termed respiration. Lastly, protoplasm has a power of motion when appropriately acted on.
This latter, which is round, is provided in the center with a cylinder that is closed above. The box contains a large number of apertures, which give passage to the products of combustion carried along by the hot air. The carbonic acid which such products contain is absorbed by a layer of quick-lime that has previously been introduced into the box, N.
Still, carbonic acid is present in very large quantities in the air in most situations, and is freely brought by the wind to all the open spaces which alone man uses for his crops and his gardening. The most important element in the food of plants is thus in effect almost everywhere available, especially from the point of view of the mere practical everyday human agriculturist.
As to the Babu, no carbonic acid gas could inconvenience his wonderful Bengali nature. He said he was safe and comfortable enough, but awfully hungry. At last the outpour of entangled exclamations and unintelligible explanations stopped, and I collected my thoughts and tried to understand what had happened to me in the cave.
"Very good; we must not commit ourselves; so we will drink the celebrated toast, Diis ignotis!" And they drained the chalice filled up with science, carbonic acid gas, perfumes, poetry, and incredulity. "If the gentlemen will go to the drawing-room, coffee is ready for them," said the major-domo.
If I take a glass and draw off some of the water, I find that it tastes a little acid to the mouth: it is impregnated with carbonic acid; and if I now apply a little lime-water to it, that will give us a test of its presence. This water will make the lime-water turbid and white, which is proof of the presence of carbonic acid. Then it is a very weighty gas it is heavier than the atmosphere.
However, the central fire diminishes, and the sun grows more feeble, so much so that one day the earth will perish of refrigeration. It will become sterile; all the wood and all the coal will be converted into carbonic acid, and no life can subsist there." "We haven't come to that yet," said Bouvard. "Let us expect it," returned Pécuchet.
The noted mineral-waters containing iron, sulphur, carbonic acid, supply nutritious or stimulating materials to the body as much as phosphate of lime and ammoniacal compounds do to the cereal plants.
I could not succeed in inflaming the small quantities of gas that rise above the thermal waters, or those I collected in a glass phial held over the springs, an operation that excited in me a nausea, caused less by the smell of the gas, than by the excessive heat prevailing in this ravine. Is this sulphuretted hydrogen mixed with a great proportion of carbonic acid or atmospheric air?
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