442 



MR. F. DARWIN ON THE POSITION OP 



Table XIII. 



Date. 



May 5, 

 8.15 a 

 May 5, 

 8.15 A.M 

 May 7, 

 8.30 



:».} 



h 



7 ' i 



A.M. J 



Lamina. 



Lamina. 



m. 

 Lamina. 



-20 -30 -20 



After above measurements, plant was fixed 

 on klinostat and kept in the dark. 



-30 



-50 



—75 



It was then (May 5th) placed on the klinostat in the dark ; 

 and it will be seen that the leaves bent backwards towards the 

 stem ; and as this occurred in the dark as well as in the light, it 

 proves that it is epinasty, and not apheliotropism, which causes 

 the movement. 



The experiment being continued, gave the same results as 

 those in Experiment 3. "When the plant was placed in the 

 normal position, either in light or darkness, the leaves rose and 

 approached the horizontal plane. "When again placed on the kli- 

 nostat in the light in the zenith position, the leaves bent epinas- 

 tically, so as to become more nearly parallel to the stem, and 

 could again be brought up through the action of apogeotropism 

 by removing the plant from the klinostat and placing it in the 

 normal position. 



Other experiments were made with plants in the lateral posi- 

 tion. The following may serve as an example. 



Experiment 5 (Table XIV.).— The plant with which experiments 

 3 and 4 were made was placed for a few days (June 27th to 

 30th) at a window so as to be illuminated obliquely from above. 



Table XIV. 



Date. 



June 30, "1 

 8.47 a.m. J 



June 30, 

 8.47 a.m. 



July 1, 



July 2, 



I- J 



yi, t 



20 A.M. / 



y 2, 

 8.30 a.m. 



Lamina. 



+71 



Lamina. 



+ 3 C 



Lamina. 



-29 



IV. 



Lamina. 



+35 



After the above measurements, the plant was placed on the 

 Klinostat in lateral position, so that the same side of the 

 plant was towards the light, as from the 27th to the 30th 

 +60 



-90 

 -90 



-80 

 -90 



-25 



Leaves Xos i and iv. are the ones which pointed away from the 

 light; and if the plant had remained laterally illuminated in 



