102 D. P. Penhallow — Tendril Movements in 



merit took place. The first motion observed was to the left, 

 and was not replaced b} r dextrorse movement for some time. 

 The entire sinistrorse action was 94*20 cm . The dextrorse was ' 

 41'80 cm , a ratio of the latter to the former of 1 : 2 -25. 



Tendril JS T o. 3. 



The time of observation was ten hours and thirty minutes, 

 commencing at ten o'clock a. m., on August 13th. The total 

 length of movement was 329'30 cm , and the average rate per 

 minute was 0*52 cm . The times of greatest movement were 

 from 1 to 3.15 P. M., and from 5.15 to 8 P. M. ; the former 

 occurring at the time of the wave of maximum temperature, the 

 latter during a diminishing temperature. The absolute maxi- 

 mum of motion was 3*55 cm per minute, and occurred during 

 the two minutes from 1.50 to 1.52 P. M., succeeding the maxi- 

 mum temperature by two hours and fifty minutes, at a time 

 when there was a slight temporary depression of temperature. 

 The distance traveled in this short interval was 7 - 10 om . 



The time of least motion was from 12.15 to I 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 mini- 

 mum of motion was 0*013 om per minute, and occurred from 

 12.15 to 1 P. M. on a decreasing temperature, and following the 

 maximum temperature by one hour and fifteen minutes. Dur- 

 ing this 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 suc- 

 ceeded by a reverse to the left. The entire amount of the 

 former was 261-50 cm ; of the latter, 67'80 cm ; the ratio of 

 dextrorse* to sinistrorse being as 1 : 0*25. 



Tendril JVo. 4. 



This tendril was taken August 14th at 8 o'clock A. M., but 

 so late in its growth that only twelve movements were ob- 

 tained. These covered seven hours and fifty minutes in all. 

 The whole length of movement was 6Q'2iO cm , and the average 

 rate per minute was 14 cm . At no time was there any ex- 

 hibition of very great activity, the tendril appearing to move 

 as if in the last stages of growth, which it really was. The most 

 rapid movement appeared at 9.41 to 9.50 A. M., the extremity 

 passing through 7.70 cm in nine minutes, an average rate of 

 0"85 cm per minute. This coincided with the highest temper- 

 ature and was just prior to a fall of two degrees. The time of 



* Dextrorse and sinistrorse are applied upon the supposition that we stand at 

 the base and look to the tip of the teudril. 



