age rate of 2h. 31m. The weather was cold, and this affected the tem- 
perature of the room, especially during the night, and consequently 
retarded a little the rate of movement. .... After the seventeenth 
revolution the internode had grown from 1 to 6 inches in length, and 
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b 
; nultimate 33, and the ultimate 24 inches 
in length; and the inclination of the whole shoot was such that a cirel 
19 inches in diameter was swept by it. When the movement c the 
lower internode was 9 and the penultimate 6 inches in length; so that, 
from the 27th to the 37th revolutions inclusive, three internodes were at 
purely herbaceous ones. The movement appears to be accelerated, up to 
4 certain point, by raising the temperature, or rather is retarded by low- 
ering it; but while the conditions are nearly the same, the rate is often 
remarkably uniform. The quickest rate of revolution of a proper stem 
observed by Mr. Darwin was that of a cyphranthus 
Tore at the rate of at least 32 inches per Hour. as 
spec shoot sweeping, night and day, 
some object around which to twine.’ 
