. The power of movement in plants . Plants; Botany. ia2 MODIFIED CIRCUMNUTATION. Chap. VIH ellipse was completed between 3 and about , the hypocotyl still bending towards the light. The hypocotyl ],-jâ 17S. was straight and upright in the morn- ing, but by 6 its upper half was bowed towards the light, so that the chord of the arc thus formed stood at an angle of 20° with the perpendicular. After 6 its -course was reversed through the action of apogeotropism, and it continued to bend from the window during the night, as shown by the broken line. On the next day it was k
. The power of movement in plants . Plants; Botany. ia2 MODIFIED CIRCUMNUTATION. Chap. VIH ellipse was completed between 3 and about , the hypocotyl still bending towards the light. The hypocotyl ],-jâ 17S. was straight and upright in the morn- ing, but by 6 its upper half was bowed towards the light, so that the chord of the arc thus formed stood at an angle of 20° with the perpendicular. After 6 its -course was reversed through the action of apogeotropism, and it continued to bend from the window during the night, as shown by the broken line. On the next day it was kept in the dark (excepting when each obRervation was made by the aid of a taper), and the course followed from 7 on the 8th to on the 9th is here likewise shown. The difference between the two parts of the figur« (177), namely, that described during the daytime on the 7th, when exposed to a rather dim lateral light, and that on the 8th in darkness, is striking. The difference consists in the lines during the first day having been drawn out in the direction of the light. The movements of the other seedling, traced under the same circumstances, were closely similar. Aplieliotropism.âWe succeeded in observing only two cases of aphelio- tropism, for these are somewhat rare; and the movements are generally so slow that they would liave been very troublesome to trace. Bigriotiia capreolata.âNo organ of any plant, as far as we have seen, bends away so quickly from the light as do the tendrils of this Bignonia. They are also remarkable from circum- nutating much less regularly than most other tendrils, often remaining stationary; they depend on aplieliotropism for coming into. â \ Bijnonia capreolata: aphe- liotropic inurement of a tendril, traced on a hori- zoutal glass from July 19th to 10 20th. Movements as origiuiilly traced, little magnified, here reduced to two-thirds of the original s< Please note that these images are extracted fro
Size: 848px × 2947px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade, booksubjectbotany, booksubjectplants
