Elements of Scientific And Practical Agriculture Or the Application of Biolog
Elements of Scientific And Practical Agriculture Or the Application of Biolog
Alonzo Gray
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) V. Light carbureted Hydrogen is found also in the atmos- phere in very small quantities. It is given off in the fermen- tation of compost heaps, and of other vegetable matter. It is found in marshes, and rises up from the bottom of ponds ; coal mines also furnish it. It is a colorless, tasteless and inodorous gas, highly inflammable and explosive when mixed with air or oxygen gas, and is fatal to life. This gas is sparingly soluble in water, and must enter the organs of plants. It is composed... of one equivalent of carbon and two of hydrogen, and may be represented by CH^. Its agency in vegetation is not well knowTi. It may yield carbon or hydrogen or both to plants. VI. Injiuenceof the Carbonic Acid of the Atmosphere. Car-, bonic acid is a constant ingredient of the atmosphere, but in very variable proportions ; generally, less than one tenth per cent, or one thousandth part by weight, and, as the acid is more than twice as heavy as air, a very much less quantity by volume. According to Saussure only 0, 000415 of the vol- 84 BIOLOGY OF PLANTS.
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