104 D. P. PenhaUow — Tendril Movements in 



tinue its nutations. From the time indicated, observations 

 were continued for twenty-three consecutive hours. The entire 

 distance traveled during that time was 511'70 cm , thus giving 

 an average rate of 037 cm each minute. The number 5b-c 

 was given to indicate a change of recording papers. This oc- 

 curred at 6.20 P. M., at a time when the tendril tip had drooped 

 to the ground and did not resume its movement until 8.35 P. 

 M., when the nutations continued as before. 



The time of most rapid movement was during the two 

 minutes from 4.55 to 4.57 P. M., on a descending tempera- 

 ture, and five hours after the maximum wave had passed. The 

 total rate of movement was 4*55 cm per minute. The times 

 of most rapid movements occurred from 8 to 10.20 a. m. ; 1.30 

 to 2 P. M. ; 4 to 5 p. M., and 10.53 to 11.05 P. M. ; the maxi- 

 mum of these being from 4 to 5 p. m. The absolute mini- 

 mum of motion occurred from 4 to 5.04 A. M., when the tip 

 traveled at the rate of 0*043 cm per minute, this being at a 

 time of low temperature. The times of least movement were 

 from 10.20 A. M. to 1.30 p. m. ; 2 to 4 P. M ; 5.30 to 10 P. M. 

 and from 11.05 during the remainder of the night and until the 

 end of the experiment at seven o'clock in the morning. There 

 appears in these observations a very sharp division at 5.30 P. 

 M., between the waves of more rapid daily movement and the 

 waves of slower motion during the night. 



The experiment commenced with very pleasant weather and 

 all parts of the plant in vigorous condition, the leaves being 

 erect and the flowers open. From 12 M. to 4 P. M. the leaves 

 were drooping and the activity of the plant small. This, with 

 the exception of one- half hour from 1.30 to 2 P. M., was a time 

 of slow movement. At 4 o'clock P. M., the leaves began to 

 resume their normal, fresh appearance, and so continued until 

 the close of observations. Towards morning a very heavy fog 

 gathered and reached its maximum at four o'clock, the time 

 when the absolute minimum of motion occurred. 



Sinistrorse movement was first noticed. In the movements of 

 this tendril, there appeared a greater equality between right 

 and left motion than was noticed in any of those previously 

 experimented upon. The entire dextrorse movement was 

 28210 cm ; the sinistrorse 229-60 em , a ratio of 1 : 0*81. 



Tendril No. 6a-b. 



As in the preceding case, the letters a-b designate a change 

 of paper. This occurred at 7 o'clock P. M., while the tendril 

 was quite active, but it in no way disturbed the movement. 

 The filament was selected August 14th at 1.15 P. M., when a 

 short time from the bud, and observations were continued con- 

 secutively for eighteen hours and fifteen minutes. The dis- 



