. Elementary plant physiology. Plant physiology. Exchange and Movements of Gases and Liquids. 71 tube with boiled water. Support in an upright position, with the lower end of the tube immersed in mercury to the zero point, or to the lowest division of the calibrated portion. If the leafy shoot withdraws water from the tube, mercury drawn up will replace it. Transpiration thus exercises an indirect lifting power. The living cells in the leaves give off watery vapor into the intercellular spaces, and withdraw water from the nearest cells to replace the loss. These in turn act in the same manner
. Elementary plant physiology. Plant physiology. Exchange and Movements of Gases and Liquids. 71 tube with boiled water. Support in an upright position, with the lower end of the tube immersed in mercury to the zero point, or to the lowest division of the calibrated portion. If the leafy shoot withdraws water from the tube, mercury drawn up will replace it. Transpiration thus exercises an indirect lifting power. The living cells in the leaves give off watery vapor into the intercellular spaces, and withdraw water from the nearest cells to replace the loss. These in turn act in the same manner until those nearest the woody cells are. Fig. 50.—Method of cutting brancli under water. After Oels. replenished from them, and thus communicate the movement throughout the entire branch. The branch may be joined to the tube by a short section of rubber tubing. In this instance the joints should be wrapped with wire twisted into position. 65. Estimation of amount of water transpired.— Secure a balance with a capacity of 5 kilograms, and a plant growing in a four or five inch pot, and which has a large leaf surface. Set the pot in a small glass jar, and tie a sheet of rubber around the top of the jar and the base of the stem by means of a cord, taking precautions not to injure the 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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