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Updated: June 26, 2025
Black, he had become imbued with the enthusiasm of his teacher, continuing Black's investigations as to the properties of carbonic-acid gas when free and in combination.
In the Phlægræn Field there are a number of other craters of small size, with very low cones about them. These appear to have been the product of brief, slight eruptions. That known as the Solfatara, though not in eruption during the historic period, is interesting for the fact that from the crevices of the rocks about it there comes forth a continued efflux of carbonic-acid gas.
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.
It was greatly approved of. Unhappily, there was not quite enough soda water to supply a drink for all of them; but those who tasted it were deeply impressed. I could see that they took the bite of carbonic-acid gas for evidence of a most powerful and present deity. That settled our position. We were instantly regarded, not only as Buddhists, but as mighty magicians from a far country.
It is ordinarily supposed that carbonic-acid gas, being heavier, sinks to the bottom of the room, and that thus trundle-beds, for instance, are especially unwholesome. This would be so, were the gas pure. As a matter of fact, however, being warmed in the body, and thus made lighter, it rises into the common air, so that usually more will be found at the top than at the bottom of a room.
The difference produced by this latter fact he minimises by dwelling on the probability of a greater proportion of carbonic-acid gas and water-vapour in the Martian atmosphere, and thus brings down the mean temperature of Mars to 48° F., which is almost exactly the same as that of the southern half of England.
Thus do the animal and vegetable worlds play into each other's hands. The animal is dependent upon the vegetable for its carbon, which it releases again, through the life processes, as carbonic-acid gas, to be again drawn into the cycle of vegetable life.
According to the best authorities, you may count on findin' oxygen, nitrogen, and carbonic-acid gases in it not to mention foreign substances at times, such as dust leaves, bits of old newspaper and the like, except at sea, where it is always pure and good." "But with plenty of salt in it," interposed Miss Millet, "though not enough to cure you of bad habits, brother.
Under the action of chlorophyll and sunlight these substances are split up, the carbon, oxygen and hydrogen being combined into plant food. It is either used immediately or stored away for future emergency. Trees breathe somewhat like human beings. They take in oxygen and give off carbonic-acid gas.
Occasionally it happens that the port-holes are opened while there still flickers a little blue flame above the whitening embers. In this case there is death in the stove. The carbonic-acid gas, which is still proceeding from the burning charcoal, enters the room, and produces asphyxia, or at all events some of its symptoms.
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