. The power of movement in plants . Plants; Botany. 256 CIECUMNUTATION OF LEAVES. Chap. IV 5 and 6 On the next day the leaf stood at only 10° ahore the horizon at , and it remained at about 15^ till past 3 ; at it was 23°, and at 58°; so that the rise was more sudden this evening than on the previous one, and the difference in the angle amounted to 48°. The movement is obviously periodical, and as the leaf stood on the first night at 55°, and on the second night at 58° above the horizon, it appeared very steeply inclined. This case, as we in a fu
. The power of movement in plants . Plants; Botany. 256 CIECUMNUTATION OF LEAVES. Chap. IV 5 and 6 On the next day the leaf stood at only 10° ahore the horizon at , and it remained at about 15^ till past 3 ; at it was 23°, and at 58°; so that the rise was more sudden this evening than on the previous one, and the difference in the angle amounted to 48°. The movement is obviously periodical, and as the leaf stood on the first night at 55°, and on the second night at 58° above the horizon, it appeared very steeply inclined. This case, as we in a future chapter, ought perhaps to have been included under the head of sleeping plants. (33.) Pontederia (sp. ?) (from the highlands of St. Catharina, Fig. Pontedei'ia (sp. ?) : circumnutatron of leaf, traced from July 2nd to 4th. Apex or leaf 16J inches from the vertical glass, so ti'acing greatly magnified. Temp, about 17° C, and therefore rather too low. Brazil) (Pontederiacese, !Fam. 46).—A filament was fixed across the apex of a moderately young leaf, 7i inches in height, and its movements were traced during 421 h. (see Tig. 118). On the first evening, when the tracing was begun, and during Ihe night, the leaf descended considerably. On the next morning it ascended in a strongly marked zigzag line, and descended again in the evening and during the night. The movement, therefore, seems to be periodic, but some doubt is thrown on this conclusion, because another leaf, 8 inches in height, appearing older and standing more highly inclined, behaved differently. During the first ]2 h. it drcumnutated over a. 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: 1828px × 1367px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectbotany, booksubjectplants, bookyear18
