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This action is brought about by carbonic acid acting on the rock and producing what is called carbonate of lime, and the stalactites and stalagmites found in all these caverns are of that material." "What is the difference between the two names you have just mentioned?"
Front seats: a few old folk, shiny-headed, slant up best ear towards the speaker, drop off asleep after a while, when the air begins to get a little narcotic with carbonic acid. An indefinite number of pairs of young people, happy, but not always very attentive. Boys, in the background, more or less quiet. Dull faces here, there, in how many places!
If you ask, for instance, Asplenium viride how it contrives to grow plentifully in the Craven of Yorkshire down to 600 or 800 feet above the sea, while in Snowdon it dislikes growing lower than 2000 feet, and is not plentiful even there? it will reply Because in the Craven I can get as much carbonic acid as I want from the decomposing limestone; while on the Snowdon Silurian I get very little; and I have to make it up by clinging to the mountain tops, for the sake of the greater rainfall.
There was also a possibility that a small quantity of ozak, as the stuff was called, mixed with pure water, would form a reducing agent for limestone, and perhaps for other minerals, which would work much quicker than if the liquid was merely impregnated with carbonic acid gas. He endeavored to purchase some ozak from Mr.
How few understand that after air has received ten per cent of this fatal gas, if drawn into the lungs, it can no longer take carbonic acid from the capillaries! No wonder there is so much impaired nervous and muscular energy, so much scrofula, tubercles, catarrhs, dyspepsia, and typhoid diseases. I hope you can do much to remedy the poisonous air of thousands and thousands of stove-heated rooms."
The bean has been able to perform this great chemical feat by the help of its green colouring matter, or chlorophyll; for it is only the green parts of the plant which, under the influence of sunlight, have the marvellous power of decomposing carbonic acid, setting free the oxygen and laying hold of the carbon which it contains.
"'Carbonic acid gas, I answered, looking towards the same window. "'Right, assented Zinotchka. 'Plants, on the contrary, breathe in carbonic acid gas, and breathe out oxygen. Carbonic acid gas is contained in seltzer water, and in the fumes from the samovar. . . . It is a very noxious gas.
In fact, it appeared from experiment that the dose of carbon might with advantage be so great as not only to be itself oxidized into carbonic oxide by the oxygen of the nitro-glycerine, but to reduce the carbonic acid developed by the explosion of the latter itself into carbonic oxide.
But an analogy is not an explanation, and why a few drops of yeast should change a saccharine mixture to carbonic acid and alcohol, a little leaven leavening the whole lump, not by combining with it, but by setting a movement at work, we not only cannot explain, but the fact is such an exception to the recognized laws of combination that Liebig is unwilling to admit the new force at all to which Berzelius had given the name so generally accepted.
It is estimated that the blood is pumped through the lungs at the rate of eight hundred quarts per hour, and that during that period it rids itself of about thirty quarts of carbonic acid gas, and absorbs about the same amount of oxygen. Think for a moment of the madness of obstructing this interchange of elements which is perpetually going on and on which life depends!
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