. Lessons in botany. Botany. 46 BOTANY. of the protoplasm on the elastic cell wall makes the cell turgid. So we found in the experiments with the slices of beet in the salt solution and water that the partial removal of the water from the beet leaves the slices limp, while they regain their rigidity if the salt solution is removed and the slices are placed in water. We should now endeavor to see if water plays any part in the rigidity of plant parts, as in the case of shoots, leaves, etc., and in what way this rigidity may be lost and regained. Exercise 20. 83. Loss of turgidity in out shoots.
. Lessons in botany. Botany. 46 BOTANY. of the protoplasm on the elastic cell wall makes the cell turgid. So we found in the experiments with the slices of beet in the salt solution and water that the partial removal of the water from the beet leaves the slices limp, while they regain their rigidity if the salt solution is removed and the slices are placed in water. We should now endeavor to see if water plays any part in the rigidity of plant parts, as in the case of shoots, leaves, etc., and in what way this rigidity may be lost and regained. Exercise 20. 83. Loss of turgidity in out shoots.—From a living geranium, balsam, coleus, or other plant, cut a leafy shoot i§cm to 20cm long. Leave it in a dry room for a short while until it partly wilts. Grasp the shoot at the cut end and attempt to hold it erect. How does it now compare with its condition when first cut from the plant ? 84. Restoration of turgidity in shoots.—Take the leafy shoot used in paragraph 83. (It should not be so wilted that any portion of it is dry.) Cut the,end fresh again and place it in a vessel of water, and if the room is dry, cover the vessel and shoot with '"'::_ a tall glass cylinder or bell jar. Observe the result in a few hours, or on the following day. 85. Longitudinal tissue tension.—For this in early summer one may use the young and succulent shoots of the elder (sambucus) ; or the petioles of rhubarb during the summer and early autumn; or the petioles of richardia. Petioles of caladium are. Fig. 36. Same plant photographed four hours late has 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 and company
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