. The power of movement in plants . Plants; Botany. 382 MODIFIED CIECUMNUTATION. Chap. VH do not fully apply to the small leaf here figured. The pinnsB move forwards and at the same time sink downwards, whilst the main petiole rises considerably. With respect to the degree of movement: the two terminal pinnte of one specimen formed together an angle of 100° during the day, and at night of only 38°, so each had moved 31° forwards. The penultimate pinnse during the day formed together an angle of 180°, that is, they stood in a straight line opposite one another, and at night each had moved 65° f
. The power of movement in plants . Plants; Botany. 382 MODIFIED CIECUMNUTATION. Chap. VH do not fully apply to the small leaf here figured. The pinnsB move forwards and at the same time sink downwards, whilst the main petiole rises considerably. With respect to the degree of movement: the two terminal pinnte of one specimen formed together an angle of 100° during the day, and at night of only 38°, so each had moved 31° forwards. The penultimate pinnse during the day formed together an angle of 180°, that is, they stood in a straight line opposite one another, and at night each had moved 65° forwards. The basal pair of pinnae were directed Fig. A. B. Acacia Famesiana: A, leaf during the day; B, the same leaf at night. during the day, each about 21° backwards, and at night 38° forwards, so each had moved 59° forwards. But the pinnje at the same time sink greatly, and sometimes hang almost perpen- dicularly downwards. The main petiole, on the other hand, rises much: by one stood 34° higher than at noon' and by on the following morning it was still higher by 10°; shortly after this hour the diurnal sinking move- ment commenced. The course of a nearly full-grown leaf was traced during 14 h.; it was strongly zigzag, and apparentlj. 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
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Keywords: ., bookcentury1800, booksubjectbotany, booksubjectplants, bookyear18
