i TWINING PLANTS. Chap. I. 



3 hrs. 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 3 hrs. I should add that the temperature 

 of the room varied only a little. The shoot had now 

 grown 3 J 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. 30 m. 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. 31 m. ; 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 



