. Practical text-book of plant physiology. Plant physiology. 26 RELATIONS OF PLANTS TO MECHANICAL FORCES upper and lower sides. Examine the epidermal cells of the con- cave surface constituting the perceptive zone (Fig. 11).1. Fig. i i. Sections showing the character of the cell contours in a longitudinal sec- tion of a tendril. A, epidermis and cortex of convex side before curvature. B, after curvature. C, concave side before curvature. D, after curvature. 39. Comparison of the Irritability of Tendrils and Mimosa. Allow a stream of water to fall in a shower upon sensitive tendrils as in the e
. Practical text-book of plant physiology. Plant physiology. 26 RELATIONS OF PLANTS TO MECHANICAL FORCES upper and lower sides. Examine the epidermal cells of the con- cave surface constituting the perceptive zone (Fig. 11).1. Fig. i i. Sections showing the character of the cell contours in a longitudinal sec- tion of a tendril. A, epidermis and cortex of convex side before curvature. B, after curvature. C, concave side before curvature. D, after curvature. 39. Comparison of the Irritability of Tendrils and Mimosa. Allow a stream of water to fall in a shower upon sensitive tendrils as in the experiment with Mimosa (27). Does curvature follow? Arrange to have the water mixed with a quantity of fine sand. This can be done by placing a quantity of sand in the bottom of the vessel containing the water and stirring as the water flows out through the siphon tube. Note the result of the action of the minute mineral particles. Strike the stem at the base of an active tendril so that it will be shaken violently. ,Note the reactions to shock. Are they similar to those of contact? Apply a steady but gentle pressure to the tip of a leaflet of Mimosa taking care, not to crush or bruise the tissues. Is Mimosa sensitive to contact ? 40. Contact Reactions of Drosera. Specimens of Drosera should be cultivated in shallow wooden or earthenware dishes con- taining peat and brought into a room kept at 20 to 250 C. for the 1 MacDougal. Mechanism of the curvature of tendrils. Annals of Botany, IO: 373. 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 [etc. ] Longmans, Green, and Co.
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