Onapr. VIII. EFFECTS OF VARIOUS SALTS. 181 
immersed for 8 hrs. 40 m., each in 80 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 80 minims of a solution of one part to 875 
of water; but they were not at all alfected, excepting that the 
glands looked rather pale. 
Lithium, Acetute 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, 
qs 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 phosphato 
of ammonia, and ail 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 487 of 
water; after 1 h. 30 m. all four were a little, and after 24 hrs. 
greatly, inflected. J then diluted the solution with some 
water, but they still remained somewhat inflected on the third 
day. 
Cesium, Chloride of —Four leaves were immersed, as above, in 
120 minims of a solution of one part to 437 of water. After 
l hr. 5m. 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 487 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. 
nll were immensely inflected. 
Silver, Nitrate of.— Three leaves were immersed in ninety 
