. The power of movement in plants . Plants; Botany. 434 MODIFIED CIECUMNtJTATION. Chap. VUL all pointing to the ground, was reversed, being still kept hori> zontal, so that the pods now pointed directly upwards; it was then placed in a dark cupboard, but the pods still pointed up- wards after four days and nights. The pot, in the same position, was next brought back into the light, and after two days there was some bending downwards of the peduncles, and on the fourth day two of them pointed to the centre of the earth, as did the others after an additional day or two. Another plant, in a po
. The power of movement in plants . Plants; Botany. 434 MODIFIED CIECUMNtJTATION. Chap. VUL all pointing to the ground, was reversed, being still kept hori> zontal, so that the pods now pointed directly upwards; it was then placed in a dark cupboard, but the pods still pointed up- wards after four days and nights. The pot, in the same position, was next brought back into the light, and after two days there was some bending downwards of the peduncles, and on the fourth day two of them pointed to the centre of the earth, as did the others after an additional day or two. Another plant, in a pot which had always stood upright, was left in the dark cupboard for six days; it bore 3 peduncles, and only one became within this Fig. Cyclamen Persicum: downward apheliotropic tnovenient of a flower-peduncle, greatly magnified (about 47 times ?), traced on a horizontal glass from 1 Feb. 18th to 8 21st. time at all bowed downwards, and that doubtfully. The weight, therefore, of the pods is not the cause of the bending down. This pot was then brought back into the light, and after three days the peduncles were considerably bowed downwards. We are thus Jed to infer that the downward curvature is due to apheliotropism; though more trials ought to have been made. In order to observe the nature of this movement, a peduncle bearing a large pod which had reached and rested on the ground, was lifted a little up and secured to a stick. A filament was fixed across the pod with a mark beneath, and its move-. 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 : D. Appleton
Size: 1367px × 1828px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectbotany, booksubjectplants, bookyear18
