. Soils and plant life as related to agriculture . Agriculture; Soils; Plants. 90 SOILS AND PLANT LIFE 66. The Green Leaf likened to a Mill. — The process may be likened to the work in a mill where com and oats, we shall say, are ground together to make the " ; The water from the root corresponds to the corn; the car- bon dioxide from the air, to the oats; the green leaf, to the mill; the sun- light to the en- gine; and the starch formed, to the grist. If any part is lacking, no grist can be produced. EXERCISE 30 Object. —To learn how and when food is man- ufactured in the leav
. Soils and plant life as related to agriculture . Agriculture; Soils; Plants. 90 SOILS AND PLANT LIFE 66. The Green Leaf likened to a Mill. — The process may be likened to the work in a mill where com and oats, we shall say, are ground together to make the " ; The water from the root corresponds to the corn; the car- bon dioxide from the air, to the oats; the green leaf, to the mill; the sun- light to the en- gine; and the starch formed, to the grist. If any part is lacking, no grist can be produced. EXERCISE 30 Object. —To learn how and when food is man- ufactured in the leaves. Procedure.— Place a few grains of starch in a saucer and cover with two or three teaspoonfuls of water. Add a drop of tincture of iodine, and note that a blue-black color appears. This is the test for the presence of starch. Secure a potted plant, or use any growing plant in the schoolyard. Provide several corks and pins, a small pan of wood alcohol and some tincture of iodine. Place slices of cork on opposite sides of a leaf and thrust a pin through both to hold them snugly and firmly against the leaf so that no sunlight can reach it where they are held against its surface. The remainder of the leaf will be exposed to the light. Prepare several leaves in this Fig. 29. — The green leaf as a 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 Cunningham, Jules Cool, 1879-; Lancelot, William Henry, 1874-. New York : Macmillan
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Keywords: ., bookcentury1900, bookd, booksubjectagriculture, booksubjectplants
