. Experiments with plants. Botany. TBJS WOMK OF ROOTS 137 matters absorbed by the plant ? We may easily answer this question by burning the plant, since whatever remains after thorough burning represents mineral matters which have been absorbed by the plant. "We first dry the plant thoroughly in the sun or in an oven; we then break it into small pieces, place them on a small iron shovel and heat it red-hot. Continue the heating until the ash becomes white, or nearly so, on cooling. If we weigh the plant before and after drying, and also the ash left after burning, we shall know approxi- m
. Experiments with plants. Botany. TBJS WOMK OF ROOTS 137 matters absorbed by the plant ? We may easily answer this question by burning the plant, since whatever remains after thorough burning represents mineral matters which have been absorbed by the plant. "We first dry the plant thoroughly in the sun or in an oven; we then break it into small pieces, place them on a small iron shovel and heat it red-hot. Continue the heating until the ash becomes white, or nearly so, on cooling. If we weigh the plant before and after drying, and also the ash left after burning, we shall know approxi- mately how much water, how much cellulose (see page 66) or woody fiber (the combustible part), and how much mineral matter it con- tains. Is the absorbed mineral matter of use to the plant ? In order to deprive the plant of its supply of mineral mat- ter, we must furnish it with distilled water instead of or- T. , -TTT 1 95. A still for making distilled water; dmary water. We may ob- it consists of two pans and a eake- tain distilled water by means *" <'»" °* graniteware or tinware). of the apparatus shown in Fig. 95. It consists of two pans and a cake-tin, the central cone of which has been shortened to the proper length by making vertical cuts with a pair of stout shears and then bend- ing back the flaps as shown in the figure. Water is. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Osterhout, Winthrop John Van Leuven, 1871-. New York, The Macmillan company; London, Macmillan & co. , ltd.
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