164 DROSERA ROTUNDIFOLIA. [Cuar. IX. 
than 1 hr. some of them had a few tentacles inflected. In 3 hrs. most 
of the glands became whitish, others dark-coloured, and many oddly 
mottled. After 6 hrs. two of the leaves had a good many tentacles 
inflected, but this very moderate degree of inflection never increased. 
One of the leaves was taken out of the solution after 4 hrs., and placed 
in water ; by the next morning some few of the inflected tentacles had 
re-expanded, showing that they were not dead; but the glands were 
still much discoloured. Another leaf not included in the above lot, 
after an immersion of 3 hrs. 15 m., was carefully examined; the pro- 
toplasm in the cells of the outer tentacles, and of the short green ones 
on the disc, had become strongly aggregated down to their bases; and 
I distinctly saw that the little masses changed their positions and 
shapes rather rapidly ; some coalescing and again separating. I was 
surprised at this fact, because quinine is said to arrest all movement in 
the white corpuscles of the blood; but as, according to Binz,* this is 
due to their being no longer supplied with oxygen by the red corpuscles, 
any such arrestment of movement could not be expected in Drosera. 
That the glands had absorbed some of the salt was evident from their 
change of colour; but I at first thought that the solution might not 
have travelled down the cells of the tentacles, where the protoplasm 
was seen in active movement. This view, however, I have no doubt, 
is erroneous, for a leaf which had been immersed for 3 hrs. in the 
quinine solution was then placed in wu little solution of one part of 
carbonate of ammonia to 218 of water; and in 30 m. the glands and 
the upper cells of the tentacles became intensely black, with the pro- 
toplasm presenting » very unusual appearance; for it had become 
aggregated into reticulated dingy-coloured masses, having rounded and 
angular interspaces. As I have never seen this effect produced by the 
carbonate of ammonia alone, it must be attributed to the previous 
action of the quinine. These reticulated masses were watched for 
some time, but did not change their forms; so that the protoplasm no 
doubt had been killed by the combined action of the two salts, though 
exposed to them for only a short time. 
Another leaf, after an immersion for 24 hrs. in the quinine solution, 
became somewhat flaccid, and the protoplasm in all the cells was 
ageregated. Many of the aggregated masses were discoloured, and 
presented a granular appearance; they were spherical, or elongated, or 
still more commonly consisted of little curved chains of small globules. 
None of these masses exhibited the least movement, and no doubt were 
all dead. 
Half-minims of the solution were placed on the discs of six leaves; 
after 23 hrs. one had all its tentacles, two had a few, and the others 
none inflected; so that the discal glands, when irritated by this salt, 
do not transmit any strong motor impulse to the outer tentacles.. 
After 48 hrs. the glands on the discs of all six leaves were evidently 
* ‘Quarterly Journal of Microscopical Science,’ April 1874, p. 185, 
