148 DROSERA ROTUNDIFOLLA. [Cuar. VIII. 
_ Potassium, Bromide of.—Half-minims ofa 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 alter 24 hrs. they became splendidly inflected. 
Three leaves were also immersed for 21 hrs. in 80 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 ina 
vessel containing 120 minims of a solution of one part to 487 of water ; 
so that each received, if the leaves absorbed equally, ~ 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. 
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 
hr. 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. 
Cesium, Chloride of—Four leaves were immersed, as above, in 120 
minims of a solution of one part to 487 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 minims 
of a solution of one part to 437 of water; so that each received, as 
before, #1; of a grain. After 5 m. slight inflection, and after 11 m. 
very strong inflection, the glands becoming excessively black; after 
40 m. all the tentacles were closely inflected. After 6 hrs. the leaves 
were taken out of the solution, washed, and placed in water; but 
next morning they were evidently dead. 
Calcium, Acetate of —Four leaves were immersed in 120 minims of 
a solution of one part to 437 of water; after 24 hrs. none of the 
tentacles were inflected, excepting a few where the blade joined the 
petiole; and this may have been caused by the absorption of the salt 
by the cut-off end of the petiole. Ithen added some of the solution 
(1 gr. to 20 oz.) of phosphate of ammonia, but this to my surprise 
excited only slight inflection, even after 24 hrs. Hence it would 
appear that the acetate had rendered the leaves torpid. 
