4 TWINING PLANTS. Onar. I. 
3hrs. As on the succeeding morning I found that the 
shoot revolved in 2 hrs. 45 m., it must have made during 
the night four revolutions, each at the average rate of 
a little over 3hrs. I should add that the temperature 
of the room varied only a little. The shoot had now 
grown 33 inches in length, and carried at its extremity 
a young internode 1 inch in length, which showed 
slight changes in its curvature. The next or ninth 
revolution was effected in 2 hrs. 830m. From this time 
forward, the revolutions were easily observed. The 
thirty-sixth revolution was performed at the usual 
rate ; so was the last or thirty-seventh, but it was not 
completed ; for the internode suddenly became upright, 
and after moving to the centre, remained motionless. 
I tied a weight to its upper end, so as to bow it slightly 
and thus detect any movement; but there was none. 
Some time before the last revolution was half performed, 
the lower part of the internode ceased to move. 
A few more remarks will complete all that need be 
said about this internode. It moved during five 
days; but the more rapid movements, after the per- 
formance of the third revolution, lasted during three 
days and twenty hours. The regular revolutions, 
from the ninth to thirty-sixth inclusive, were effected 
at the average rate of 2 hrs. 31m.; but the weather was 
cold, and this affected the temperature of the room, 
especially during the night, and consequently retarded 
the rate of movement a little. There was only one 
irregular movement, which consisted in the stem rapidly 
making, after an unusually slow revolution, only the 
