Cuar. X. DIRECTION OF INFLECTED TENTACLES. 245 
plan is to place a particle of the phosphate of lime 
moistened with saliva on a single gland on one side 
of the disc of a large leaf, and another particle on a 
single gland on the opposite side. In four such 
trials the excitement was not sufficient to affect the 
outer tentacles, but all those near the two points 
were directed to them, so that two wheels were formed 
on the disc of the same leaf; the pedicels of the 
tentacles forming the spokes, and the glands united 
in a mass over the phosphate representing the axles. 
The precision with which each tentacle pointed to 
the particle was wonderful; so that in some cases I 
could detect no deviation from perfect accuracy. 
Thus, although the short tentacles in the middle of 
the disc do not bend when their glands are excited 
in a direct manner, yet if they receive a motor impulse 
from a point on one side, they direct themselves to the 
point equally well with the tentacles on the borders of 
the dise. 
In these experiments, some of the short tentacles on 
the disc, which would have been directed to the centre, 
had the leaf been immersed in an exciting fluid, were 
now inflected in an exactly opposite direction, viz. 
towards the circumference. These tentacles, therefore, 
had deviated as much as 180° from the direction which 
they would have assumed if their own glands had 
been stimulated, and which may be considered as the 
normal one. Between this, the greatest possible and no 
deviation from the normal direction, every degree could 
be observed in the tentacles on these several leaves. 
Notwithstanding the precision with which the tentacles 
generally were directed, those near the circumference 
of one leaf were not accurately directed towards some 
phosphate of lime at a rather distant point on the 
opposite side of the disc. It appeared as if the motor 
