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
1/16 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 aggregated. 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 respectively 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 [page 201] of two other leaves, after an immersion for 2 hrs. in
a stronger solution, of one part of the citrate to 218 of water, became
of an opaque, pale pink colour, which before long disappeared, leaving
them white. One of these two leaves had its blade and tentacles greatly
inflected; the other hardly at all; but the protoplasm in the cells of
both was aggregated down to the bases of the tentacles, with the
spherical masses in the cells close beneath the glands blackened. After
24 hrs. one of these leaves was colourless, and evidently dead.
Sulphate of Quinine. Some of this salt was added to water, which is
said to dissolve 1/1000 part of its weight. Five leaves were immersed,
each in thirty minims of this solution, which tasted bitter. In less
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
181