257 
of Rhythm in Plants . 
downwards, the klinostat was stopped, and the stem continued 
to bend until it had completed thirty minutes when it reversed 
its direction, and bent per- 
manently upwards. 
We now give a few ex- 
amples of a rhythmic con- 
dition induced by heliotropic 
stimulus. The plants used 
were seedlings of the Canary 
Grass ( P ha tar is canariensis). 
The klinostat was arranged 
vertically, and as before made 
a half-turn every half-hour. 
In the following tables and 
diagrams -f- means a curva- Fig. 5. 
ture towards, — away from the light. 
Exp. X. Mar. 20, 1890. Phalaris. 
p. 
Minutes. 
Movement. 
Ill 
20 
+ 
10 
IV 
*5 
+ 
15 
_ 
V 
r 5 
+ 
l 6 
“ 
Klinostat stopped 
VI 15 
15 
and continued 
| 3o' 
25' A 
B 
3 °'A 
x B 
These results are graphically given in Figure 6 . It 
should be noted that when, in the heliotropic experiments, 
