. The power of movement in plants. Plants; Botany. Ohap. I. BEASSICA. 15 23rd to on Dec. 25th. No doubt tlie natural move- ment was much disturbed by the two legs having been tied together; but we see that it was distinctly zigzag, first in one direction and then in an almost opposite one. After 3 on the 24;th the arched hypocotjl sometimes remained stationary for a considerable time, and when moving, moved far slower than before. Therefore, on the morning of the 25th, the glass fila- ment was removed from the base of the basal leg, and was fixed horizontally on the summit of th
. The power of movement in plants. Plants; Botany. Ohap. I. BEASSICA. 15 23rd to on Dec. 25th. No doubt tlie natural move- ment was much disturbed by the two legs having been tied together; but we see that it was distinctly zigzag, first in one direction and then in an almost opposite one. After 3 on the 24;th the arched hypocotjl sometimes remained stationary for a considerable time, and when moving, moved far slower than before. Therefore, on the morning of the 25th, the glass fila- ment was removed from the base of the basal leg, and was fixed horizontally on the summit of the arch, which, from the legs having been tied, had grown broad and almost flat. The movement was now traced during 23 hours (Fig. 5), and we Fig. Brassica oleracea: circummtating movement of the crown of a buried anil arched hypocotyl, with the two legs tied together, traced on a hori- zontal glass during 23 hours. Movement of the bead of the filament magnified about 58 times, and here reduced to one-half original scale. see that the course was still zigzag, which indicates a tendency to circumnutation. The base of the basal leg by this time had almost completely ceased to move. As soon as the cotyledons have been naturally dragged from beneath the ground, and the hypocotyl has straightened itself by growth along the inner or concave surface, there is nothing to interfere with the free movements of the parts; and the circum- nutation now becomes much more regular and clearly displayed, as shown in the following cases:—A seedling was placed ip front and near a north-east window with a line joining 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 Darwin, Charles, 1809-1882; Darwin, Francis, Sir, 1848-1925. New York, Appleton
Size: 1700px × 1470px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade, booksubjectbotany, booksubjectplants
