of Rhythm in Plants. 
259 
Another example may be given : 
Exp. XI. May 20, 1890. Phalaris. 
p. 
Minutes. 
Movement. 
I 
30 
— 
II 
3 ° 
— 
III 
to 
no observation 
IX 
X 
22 
> 
8 
XI 
23 
+ 
7 
Klinostat stopped ( 30' B 
13 
10 no curvature • 
and continued + } more than 32' A 
Here we see a half-hourly rhythm was well established by 
the tenth half-hour, and that after the klinostat stopped, 
precisely 30' elapsed before the movement was reversed. 
The above examples may serve to show the nature of the 
movements induced by the intermittent klinostat. 
Those who repeat our experiments must not expect uniform 
success, as there is undoubtedly a certain capriciousness in the 
results, which probably depends on varying degrees of vigour 
in the plants used. The experimenter must beware of em- 
ploying, in geotropic experiments, shoots which from length 
or flexibility show a droop or sag when the klinostat is 
reversed. A considerable series of our experiments were 
vitiated apparently from this cause. We were also unfortunate 
in the loss or destruction of a valuable set of notes in which 
our most successful series of experiments were recorded. We 
