Cuar. VIIL] EFFECTS OF VARIOUS SALTS. 149 
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 0z.), but this caused only very slight inflection 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 5 m. and 10m. 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, Acetate, 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 0z.) 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 degree 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. 
Magnesium, Sulphate of.—Half-minims of a solution of one part to 
218 of water were placed on the discs of ten leaves, and produced no 
effect. 
Barium, Acetate of.—Four leaves were immersed in 120 minims of 
a solution of one part to 437 of water, and after 22 hrs. there was no 
inflection, but the glands were blackened. ‘The leaves were then 
placed in a solution (1 gr. to 20 0z.) of phosphate of ammonia, which 
caused after 26 hrs. only a little inflection in two of the leaves. 
Barium, Nitrate of.—F¥our leaves were immersed in 120 minims of 
a solution of one part to 437 of water; and after 22 hrs. there was no 
more than that slight degree of inflection which often follows from an 
immersion of this length in pure water. I then added some of the 
same solution of phosphate of ammonia, and after 30 m. one leaf was 
greatly inflected, two others moderately, and the fourth not at all. 
‘The leaves remained in this state for 24 hrs. 
Strontium, Acetate of—Four leaves, immersed in 120 minims of a 
solution of one part to 437 of water, were not affected in 22 hrs. 
They were then placed in some of the same solution of phosphate of 
ammonia, and in 25 m. two of them were greatly inflected ; after g 
hrs. the third leaf was considerably inflected, and the fourth exhibited 
a trace of inflection. They were in the same state next morning, — 
Strontium, Nitrate of.—Five leaves were immersed in 120 minims 
of a solution of one part to 487 of water; after 22 hrs. there was some 
