Otar, VIIL] EFFECTS OF VARIOUS SALTS. 151 
the thinnest layer of metallic gold, and particles float about on the 
surface of the surrounding fluid. 
Lead, Chloride of.-—Yhree leaves were immersed in ninety minims 
of a solution of one part to 437 of water. After 23 hrs. there was not 
a trace of inflection; the glands were not blackened, and the leaves 
did not appear injured. They were then transferred to the solution (1 
gr. to 20 oz.) of phosphate of ammonia, and after 24 hrs. two of them 
were somewhat, the third very little, inflected; and they thus remained 
for another 24 hrs. 
Tin, Chloride of.—Four leaves were immersed in 120 minims of a 
solution of about one part (all not being dissolved) to 437 of water. 
After 4 hrs. no effect; after 6 hrs. 30 m. all four leaves had their sub- 
marginal tentacles inflected; after 22 hrs. every single tentacle and 
the blades were closely inflected. The surrounding fluid was now 
coloured pink. The leaves were washed and transferred to water, but 
next morning were evidently dead. ‘his chloride is a deadly poison, 
but acts slowly. 
Antimony, Tartrate of.—Three leaves were immersed in ninety 
minims ofa solution of one part to 437 of water. After 8 hrs. 30 m. there 
was slight inflection; after 24 hrs. two of the leaves were closely, and 
the third moderately, inflected; glands not much darkened. The 
leaves were washed and placed in water, but they remained in the same 
state for 48 additional hours. This salt is probably poisonous, but 
acts slowly. 
Arsenious Acid.—A solution of one part to 437 of water; three 
leaves were immersed in ninety minims; in 25 m. considerable inflec- 
tion; in 1 hr. great inflection; glands not discoloured. After 6 hrs. 
the leaves were transferred to water; next morning they looked fresh, 
but after four days were pale-coloured, had not re-expanded, and were 
evidently dead. 
Iron, Chloride of.—Three leaves were immersed in ninety minims of 
a solution of one part to 437 of water; in 8 hrs. no inflection; but 
after 24 hrs. considerable inflection; glands blackened; fluid coloured 
yellow, with floating flocculent particles of oxide of iron. The leaves 
were then placed in water; after 48 hrs. they had re-expanded a very 
little, but I think were killed; glands excessively black. 
Chromic Acid.—One part to 437 of water; three leaves were 
immersed in ninety minims; in 30 m. some, and in 1 hr. considerable, 
inflection; after 2 hrs. all the tentacles closely inflected, with the 
glands discoloured. Placed in water, next day leaves quite discoloured 
and evidently killed. = 
Manganese, Chloride of.—Three leaves immersed in ninety minims 
of a solution of one part to 437 of water; after 22 hrs. no more 
inflection than often occurs in water; glands not blackened, The 
leaves were then placed in the usual solution of phosphate of ammonia, 
but no inflection was caused even after 48 hrs. ee 
Copper, Chloride of.—Three leaves immersed in ninety minims of a 
solution of one part to 437 of water; after 2 hrs. some inflection ; after 
