CHAP. VIII. EFFECTS OF "VARIOUS SALTS. 181 



immersed for 8 hrs. 40 m., each in 30 minims of a solution of 

 one part to 875 of water, and were not in the least affected. I 

 do not know what to conclude from this conflicting evidence ; 

 but it is clear that the iodide of potassium does not generally 

 produce any marked effect. 



Potassium, Bromide, of. Half-minims of a solution of one part 

 to 437 of water were placed on the discs of six leaves ; after 

 22 hrs. one had its blade and many tentacles inflected, but I 

 suspect that an insect might have alighted on it and then 

 escaped; the five other leaves were in no way affected. I 

 tested three of these leaves with bits of meat, and after 24 hrs. 

 they became splendidly inflected. Three leaves were also im- 

 mersed for 21 hrs. in 30 minims of a solution of one part to 875 

 of water ; but they were not at all affected, excepting that the 

 glands looked rather pale. 



Lithium, Acetate of. Four leaves were immersed together in 

 a vessel containing 120 minims of a solution of one part to 437 

 of water ; so that each received, if the leaves absorbed equally, 

 Jg. of a grain. After 24 hrs. there was no inflection. I then 

 added, for the sake of testing the leaves, some strong solution 

 (viz. 1 gr. to 20 oz., or one part to 8750 of water) of phosphate 

 of ammonia, and all four became in 30 m. closely inflected. 



Lit/tium, Nitrate of. Four leaves were immersed, as in the 

 last case, in 120 minims of a solution of one part to 437 of 

 water ; after 1 h. 30 in. all four were a little, and after 24 hrs. 

 greatly, inflected. I then diluted the solution with some 

 water, but they still remained somew r hat inflected on the third 

 day. 



Caesium, Chloride of. Four leaves were immersed, as above, in 

 120 minims of a solution of one part to 437 of water. After 

 1 hr. 5 m. the glands were darkened ; after 4 hrs. 20 m. there 

 was a trace of inflection ; after 6 hrs. 40 m. two leaves were 

 greatly, but not closely, and the other two considerably inflected. 

 After 22 hrs. the inflection was extremely great, and two had 

 their blades inflected. I then transferred the leaves into water, 

 and in 46 hrs. from their first immersion they were almost re- 

 expanded. 



Rubidium, Chloride of. Four leaves which were immersed, as 

 above, in 120 minims of a solution of one part to 437 of water, 

 were not acted on in 22 hrs. I then added some of the strong 

 solution (1 gr. to 20 oz.) of phosphate of ammonia, and in 30 m. 

 all were immensely inflected. 



Silver, Nitrate of. Three leaves were immersed in ninety 



