182 DROSERA ROTUNDIFOLIA. Crap. VIIL 
minims of a solution of one part to 437 of water; so that each 
received, as before, ~, 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, Acctute of.—Four leaves were immersed in 120 minims 
of a solution of one part to 487 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 phospate 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 487 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 in- 
flection after 24 hrs. A fresh leaf was next put into a mixed 
solution of the above strengths of the nitrate of calcium and 
phosphate of ammonia, and it became closely inflected in between 
5m.and10m. Half-minims of a solution of one part of the 
nitrate of calcium to 218 of water were dropped on the discs of 
three leaves, but produced no effect. 
Magnesium, Acetute, Nitrate, and Chloride of. —Four leaves were 
immersed in 120 minims of solutions, of one part to 437 of water, 
of each of these three salts ; after 6 hrs. there was no inflection ; 
but after 22 hrs. one of the leaves in the acetate was rather more 
inflected than generally occurs from an immersion for this 
length of time in water. Some of the solution (1 gr. to 20 oz.) 
of phosphate of ammonia was then added to the three solutions. 
The leaves in the acetate mixed with the phosphate underwent 
some inflection; and this was well pronounced after 24 hrs. 
Those in the mixed nitrate were decidedly inflected in 4 hrs. 
30 m., but the degreé of inflection did not afterwards much 
increase; whereas the four leaves in the mixed chloride were 
greatly inflected in a few minutes, and after 4 hrs. had almost 
every tentacle closely inflected. We thus see that the acetate 
and nitrate of magnesium injure the leaves, or at least prevent 
the subsequent action of phosphate of ammonia; whereas the 
chloride has no such tendency. 
