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 submarginal 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.  This chloride is a deadly poison, but acts slowly.

Antimony, Tartrate of.—­Three leaves were immersed in ninety minims of a 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 inflection; in 1 h. 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.

Copper, Chloride of.—­Three leaves immersed in ninety minims [page 186] of a solution of one part to 437 of water; after 2 hrs. some inflection; after 3 hrs. 45 m. tentacles closely inflected, with the glands blackened.  After 22 hrs. still closely inflected, and the leaves flaccid.  Placed in pure water, next day evidently dead.  A rapid poison.

Nickel, Chloride of.—­Three leaves immersed in ninety minims of a solution of one part to 437 of water; in 25 m. considerable inflection, and in 3 hrs. all the tentacles closely inflected.  After 22 hrs. still closely inflected; most of the glands, but not all, blackened.  The leaves were then placed in water; after 24 hrs. remained inflected; were somewhat discoloured, with the glands and tentacles dingy red.  Probably killed.