200 DROSERA ROTUNDIFOLIA. Cuar. IX. 
were excited, after an interval of a quarter to three quarters of 
an hour, by being rubbed or given bits of meat. Similar drops 
of a solution of one part to 218 of water (2 grs. to 1 oz.) quickly 
blackened the glands; some few tentacles thus treated moved, 
whilst others did not. The latter, however, on being subse- 
quently moistened with saliva or given bits of meat, became 
incurved, though with extreme slowness; and this shows that 
they had been injured. Stronger solutions (but the strength 
was not ascertained) sometimes arrested all power of movement 
very quickly ; thus bits of meat were placed on the glands of 
several exterior tentacles, and as soon as they began to move, 
minute drops of the strong solution were added. They con- 
tinued for a short time to go on bending, and then suddenly 
stood still; other tentacles on the same leaves, with meat 
on their glands, but not wetted with the strychnine, continued 
to bend and soon reached the centre of the leaf. 
Citrate of Strychnine.—Half-minims of a solution of one part 
to 487 of water were placed on the discs of six leaves; after 
94 hrs. the outer tentacles showed only a trace of inflection. 
Bits of meat were then placed on three of these leaves, but in 
24 hrs. only slight and irregular inflection occurred, proving 
that the leaves had been greatly injured. Two of the leaves to 
which meat had not been given had their discal glands dry and 
much injured. Minute drops of a strong solution of one part to 
109 of water (4 grs. to 1 oz.) were added to the secretion round 
several glands, but did not produce nearly so plain an effect as 
the drops of a much weaker solution of the acetate. Particles of 
the dry citrate were placed on six glands; two of these moved 
some way towards the centre, and then stood still, being no 
doubt killed; three others curved much farther inwards, and 
were then fixed; one alone reached the centre. Five leaves 
were immersed, each in thirty minims of a solution of one part 
to 437 of water; so that each received ~, of a grain; after 
about 1 hr. some of the outer tentacles became inflected, and 
the glands were oddly mottled with black and white. These 
glands, in from 4 hrs. to 5 hrs., became whitish and opaque, 
and the protoplasm in the cells of the tentacles was well aggre- 
gated. By this time two of the leaves were greatly inflected, 
but the three others not much more inflected than they were 
before. Nevertheless two fresh leaves, after an immersion re- 
spectively for 2 hrs. and 4 hrs. in the solution, were not killed; 
for on being left for 1 hr. 30 m. in a solution of one part of 
carbonate of ammonia to 218 of water, their tentacles became 
more inflected, and there was much aggregation. The glands 
