. Elementary botany. Botany. 38 PHYSIOLOGY. stake, in another jar covering no plant, another piece of cobalt paper. They should both be p>ut under the jars at the same time. In a few moments the paper in the jar with the plant will begin to redden. In a short while, ten or fifteen minutes, prob- ably, it will be entirely red, while the paper under the other jar will remain blue, or be only slightly reddened. The water vapor passing off from the living plant comes in contact with the sensi-. Fig. 48. Fig. 49. Fig. 48.—Water vapor is given off bv the leaves when attached to the H\'ing plant-
. Elementary botany. Botany. 38 PHYSIOLOGY. stake, in another jar covering no plant, another piece of cobalt paper. They should both be p>ut under the jars at the same time. In a few moments the paper in the jar with the plant will begin to redden. In a short while, ten or fifteen minutes, prob- ably, it will be entirely red, while the paper under the other jar will remain blue, or be only slightly reddened. The water vapor passing off from the living plant comes in contact with the sensi-. Fig. 48. Fig. 49. Fig. 48.—Water vapor is given off bv the leaves when attached to the H\'ing plant- It condenses into drops of water on the coi >1 surface of the glass covering the plant Fig. 49.—A good way to show that the water passes ofi from the leaves in the form of water vapor. five cobalt chloride in the paper and reddens it before there is sufficient vapor present to condense as a film of moisture on the surface of the jar. 74. Experiment to compare loss of water in a dry and a humid atmosphere.—We should now coinpare the escape of water from the leaves of a plant covered bv a bell jar, as in the last experiment, with that which tal^cs place when the plant 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 Atkinson, George Francis, 1854-1918. New York : H. Holt
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