230 DROSERA ROTUNDIFOLIA. Cuar. X. 
It is probable that they were killed so instantly that 
they were not able to transmit any motor impulse; for 
in six observed cases (in two of which however the 
gland was quite pinched off) the protoplasm within 
the cells of the tentacles did not become aggregated ; 
whereas in some adjoining tentacles, which were 
inflected from having been roughly touched by the 
pincers, it was well aggregated. In like manner the 
protoplasm does not become aggregated when a leaf is 
instantly killed by being dipped into boiling water. 
On the other hand, in several cases in which tentacles 
became inflected after their glands had been cut off 
with sharp scissors, a distinct though moderate degree 
of aggregation supervened. 
The pedicels of the tentacles were roughly and re- 
peatedly rubbed; raw meat or other exciting sub- 
stances were placed on them, both on the upper 
surface near the base and elsewhere, but no dis- 
tinct movement ensued. Some bits of meat, after 
being left for a considerable time on the pedicels, 
were pushed upwards, so as just to touch the glands, 
and in a minute the tentacles began to bend. I 
believe that the blade of the leaf is not sensitive to 
any stimulant. I drove the point of a lancet through 
the blades of several leaves, and a needle three or four 
times through nineteen leaves: in the former case 
no movement ensued; but about a dozen of the leaves 
which were repeatedly pricked had a few tentacles 
irregularly inflected. As, however, their backs had 
to be supported during the operation, some of the 
outer glands, as well as those on the disc, may have 
been touched; and this perhaps sufficed to cause the 
slight degree of movement observed. Nitschke* saya 
* ‘Bot, Zeitung, 1866, p. 234. 
