. Elementary plant physiology. Plant physiology. Nutrition. cipitate is redissolved. This will permit, cliiefly, red and yellow rays to pass in one preparation, and blue-violet in the other. Now make up two preparations of algae, or aquatic plants, as in §93, and set inside of each inner cylinder, and cover the top with some opaque body, so that only the light which has passed through the solutions may strike the plants. Set in sunlight. Note amount and quality of gas collect- ing in the tubes in the two in- stances. Care must be taken that the same amount of material is placed in the two test
. Elementary plant physiology. Plant physiology. Nutrition. cipitate is redissolved. This will permit, cliiefly, red and yellow rays to pass in one preparation, and blue-violet in the other. Now make up two preparations of algae, or aquatic plants, as in §93, and set inside of each inner cylinder, and cover the top with some opaque body, so that only the light which has passed through the solutions may strike the plants. Set in sunlight. Note amount and quality of gas collect- ing in the tubes in the two in- stances. Care must be taken that the same amount of material is placed in the two test tubes (Fig. 60). Double-walled bell jars may be obtained, which facihtate the per- formance of this demonstration. A box with blackened inner sur- faces, and the open ends suitable for holding sheets of ruby, yellow, and blue glass, may also be used to expose plants to a portion of the spectrum (Fig. 63). 95. Relations of plants and animals to the atmos- phere.—Enclose two or three living mice in a small wire cage, and place on a ground-glass plate of the proper size to receive a bell jar. Invert a large bell jar, and fill it loosely with fresh, leafy shoots, or set a plant with many leaves beside the cage. Place the bell jar over the cage, and seal to the plate with vaseline. The cage should be in such position that the animals may be easily observed through the glass. Place the whole preparation in a dark room, or cover completely with a photographer's focussing cloth, to exclude the light. Note the condition of the mice at the end of a period of half an. Fig. 62.—Bell jar with double walls, for testing effect of colored light on liberation of oxygen. After 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 MacDougal, Daniel Trembly, 1865-1958. New York, London [etc. ] Longmans, Green, and Co.
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