Chap. Vlll.] EFFECTS OF VARIOUS SALTS. 151 



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 hra. 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 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 trans- 

 ferred 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 dark- 

 ened. The leaves were washed and placed in water, but they re- 

 mained 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 in- 

 flection; 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 min- 

 ims 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. consider- 

 able, 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 min- 

 ims 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 minima 

 of a solution of one part to 437 of water; after 2 hrs. some inflec- 

 tion; after 3 hrs. 45 m. tentacles closely inflected, with the glands 

 blackened. After 22 hrs. still closely inflected, and the leaves flac- 

 cid. Placed in pure water, next day evidently dead. A rapid 

 poison. 



Nickel, Chloride of. Three leaves immersed in ninety minima 

 of a solution of one part to 437 of water; in 25 m. considerable in* 



