Chap. Vm. EFFECTS OF VAEIOUS SALTS. 181 



immersed for 8 hrs. 40 m., each in 30 minims of a solntion 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 o/.— 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, 

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

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

 (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. 



Lithium, 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 m. all four were a little, and after 24 hrs. 

 greatly, inflected. I then diluted the solution with some 

 water, but they still remained somewhat inflected on the third 

 day. 



Ccesium, 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, bjit 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. 



Bubidium, 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 



