OF MOVEMENT IN PLANTS. 59 
ing at 10 o’clock, a.m., on August 13th. The whole length of movement was 329.30 cm., 
and the rate per minute, 0.52 cm. The times of greatest movement were from 1 to 3.15 
p.m., and again from 5.15 to 8 p.m., the former occurring at the time of the maximum tem- 
perature, the latter on a diminishing temperature. The absolute maximum of motion was 
3.55 em. per minute, and occurred from 1.50 to 1.52 p.m. succeeding the wave of maximum 
temperature by two hours and fifty minutes, at a time when there was a slight tempo- 
rary depression of heat. The distance travelled in that short interval was 7.10 cm. The 
time of least movement was from 12.15 to 1 p.m., during the time of greatest heat, and 
again from 3.15 to 5.15 p.m., following a diminution of temperature. The absolute 
minimum of motion was 0.013 cm. per minute, and occurred from 12.15 to 1 p.m. ona 
decreasing temperature, following the maximum wave by one hour and fifteen minutes. 
During that time, the weather was pleasant but somewhat cloudy. From 11 a.m. until 
5 p.m., all the leaves and flowers were drooping, indicating a weak vital action through 
excessive transpiration. The first movement recorded was to the right, soon succeeded 
by a reverse to the left. The entire amount of the former was 261.5 cm. ; of the latter, 
67.8 cm. ; and the ratio as 1 : 0.25. 
Tendril No. 4.—This tendril was taken August 14th at 8 o’clock a.m., but so late in 
its growth that only twelve movements were obtained, covering seven hours and fifty 
minutes in all. The whole length of movement was 66.20 cm., and the average rate per 
minute, 0.14cm. At no time was there any exhibition of very great activity, the tendril 
appearing to move asif in the last stages of growth, which it really was. The most rapid 
movement appeared from 9.41 to 9.50 a.m., the extremity passing through 7.7 cm. in nine 
minutes—an average rate of 0.85 cm. This coincided with the highest temperature, and 
was just prior to a fall of two degrees. The time of least activity was from 9.50 a.m. to 
3.50 pm. The absolute minimum of motion .was from 2.10.0 3.50 p.m., amounting to 
0.031 cm. per minute. It occurred on a decreasing temperature, five hours and fifty 
minutes after the maximum temperature had passed. During that time the sun was 
shining brightly, though its effects were somewhat modified by numerous clouds. From 
12 o’clock to the close of observations, during the time of least activity, the leaves and 
flowers were all depressed from the effects of the heat. | 
The movements first recorded were to the left, but after two courses changed to the 
right. The total dextrorse movement was 18.4 cm; the sinistrorse 47.80 cm., and the 
ratio 1 : 2.6. 
Tendril No. 5 a—This was taken Aug. 14th, at 4 o’clock p.m.,as soon as it had emerged 
from the bud condition ; thus very nearly the first nutations were secured. Observations 
were interrupted after a few hours, and not resumed until the next morning. The entire 
length of movement was 107.60 cm., occupying four hours and thirty minutes, thus 
giving an average rate per minute of 0.39 em. The greatest movement was at the rate of 
1.44 cm. per minute, and occurred from 4 to 4.05 p.m., at the very commencement of action 
and observation. The times of greatest movement occurred from 4 to 4.35 p.m., and again 
from 5.30 to 7 p.m., coincident with decreasing temperature. 
Least activity was noticed at 7.55 to 8.10, when the tip moved at the rate of 0.13 cm. 
per minute. This occurred at the time of lowest observed temperature, the mercury 
