Practical Physiology of Plants
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VIIl] AVEREHOA. 213 shellac-varnish a very fine glass filament along the midrib on the upper surface so as to project 2 or 3 mm. Cut out a C-shaped piece of cardboard and graduate the inner edge into 5°, i.e. make 36 graduations to the semicircle.
Now attach the card to a second stick fixed in the soil so that the pulvinus is in the centre of the arc, and so that the glass index can travel over the graduations.
The experiment is preferably conducted with illumination from above, but even with a... side light the movements are clearly seen.
The following table gives the readings in an experi- ment of this sort: Time a.m.
above horizon Time p.m.
above horizon Ap- 17, 8.57 — 27° Ap.
17, 12.44 — 9 ' 9.43 — 14 1.30 — 14° 10.18 — 9 3.30 — 19 11.45 — 18 4.40 5.20 — 15 — 23 The leaf made 3 complete oscillations in 8 hrs. 23 m.
(261) Autonomous movements: Averrhoa.
If Averrhoa bilimhi is kept at a sufficiently high temperature, (e.g. 27° C), the movements of the leaflets are easily seen.
What to read after Practical Physiology of Plants?
You can find similar books in the "Read Also" column, or choose other free books by Sir Francis Darwin to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
VIIl] AVEREHOA. 213 shellac-varnish a very fine glass filament along the midrib on the upper surface so as to project 2 or 3 mm. Cut out a C-shaped piece of cardboard and graduate the inner edge into 5°, i.e. make 36 graduations to the semicircle.
Now attach the card to a second stick fixed in the soil so that the pulvinus is in the centre of the arc, and so that the glass index can travel over the graduations.
The experiment is preferably conducted with illumination from above, but even with a... side light the movements are clearly seen.
The following table gives the readings in an experi- ment of this sort: Time a.m.
above horizon Time p.m.
above horizon Ap- 17, 8.57 — 27° Ap.
17, 12.44 — 9 ' 9.43 — 14 1.30 — 14° 10.18 — 9 3.30 — 19 11.45 — 18 4.40 5.20 — 15 — 23 The leaf made 3 complete oscillations in 8 hrs. 23 m.
(261) Autonomous movements: Averrhoa.
If Averrhoa bilimhi is kept at a sufficiently high temperature, (e.g. 27° C), the movements of the leaflets are easily seen.
What to read after Practical Physiology of Plants?
You can find similar books in the "Read Also" column, or choose other free books by Sir Francis Darwin to read onlineMoreLess
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