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.
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 [page 182]
minims of a solution of one part to 437 of water; so that each
received, as before, 1/16 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. I then 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.
Calcium, Nitrate of. Four leaves were immersed in 120 minims of a
solution of one part to 437 of water, but were not affected in 24 hrs.
I then added some of the solution of phosphate of ammonia (1 gr. to 20
oz.), but this caused only very slight inflection after 24 hrs. A fresh
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