. How crops grow. A treatise on the chemical composition, structure, and life of the plant, for all students of agriculture ... Agricultural chemistry; Growth (Plants). THE VOLATILE PART OF PLANTS. 41 brought to its mouth. At first a slight explosion is heard from the sudden burning of a mixture of the gas with air that forms at tlie mouth of the vessel; then the gas is seen huruing on its lower surface with a pale flame. If now the taper be passed into the bottle it will be extinguished; on low- ering it again, it will be relighted by the burning gas; finally, if the bot- tle be suddenly turn
. How crops grow. A treatise on the chemical composition, structure, and life of the plant, for all students of agriculture ... Agricultural chemistry; Growth (Plants). THE VOLATILE PART OF PLANTS. 41 brought to its mouth. At first a slight explosion is heard from the sudden burning of a mixture of the gas with air that forms at tlie mouth of the vessel; then the gas is seen huruing on its lower surface with a pale flame. If now the taper be passed into the bottle it will be extinguished; on low- ering it again, it will be relighted by the burning gas; finally, if the bot- tle be suddenly turned mouth upwards, the light hydrogen rises in a sheet of flame. In the above experiment, the hydrogen burns only where it is in contact with atmospheric oxygen; the product of the combustion is an oxide of hydrogen, the universally dif- fused compound, water. The conditions of the experiment do not permit the collection or identification of this wa- ter; its production can, however, readily be demon- strated. Exp. 14.—The arrangement shown in fig. 8 may be employed to ex- hibit the formation of water by the burning of hydrogen. Hydrogen gas is generated from zinc and dilute acid in the two-necked bottle. Thus produced, it is mingled with vapor of water, to remove which it. Fig. 8. Is made to stream slowly through a wide tube fllftd with fragments of dried chloride of calcium, which desiccates it perfectly. After air has been entirely displaced from the apparatus, the gas is ignited at the up- curved end of the narrow tube, and a clean bell-glass is supported over the flame. "Water collects at onee, as dew, on the interior of the bell, and shortly flows down in drops into a vessel placed beneath. In the mineral world we scarcely find hydrogen occur- ring in much quantity, save as water. It is a constant m- gredient of plants and animals, and of nearly all the numberless substances which are products of organic life. Digitized by Microsoft®. Please note that these images
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectagricul, bookyear1868
