Cuap. VIII. EFFECTS OF VARIOUS SALTS. 183 
Magnesium, Sulphate of—Half-minims of a solution of one part 
to 218 of water were placed on the discs of ten leaves, and pro- 
duced no effect. 
Barium, Acetate of —Four leaves were immersed in 120 ininims 
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 02.) of phosphate of 
ammonia, which caused after 26 hrs. only a little inflection in 
two of the leaves. 
Barium, Nitrate 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 more than that slight degree of inflection, which often 
follows from an immersion of this length m 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 8 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 slight inflection, but not more than sometimes 
occurs with leaves in water. They were then placed in the 
same solution of phosphate of ammonia; after 8 hrs. three of 
them were moderately inflected, as were all five after 24 hrs.; 
but not one was closely inflected. It appears that the nitrate of 
strontium renders the leaves half torpid. 
Cadmium, Chloride of.—Three leaves were immersed in ninety 
minims of a solution of one part to 437 of water; after 5 hrs. 
20 m. slight inflection occurred, which increased during the 
next three hours. After 24 hrs. all three leaves had their 
tentacles well inflected, and remained so for an additional 24 
hrs.; glands not discoloured. 
Mercury, Perchloride of.—Three leaves were immersed in ninety 
minims of a solution of one part to 487 of water; after 22 m. 
there was some slight inflection, which in 48 m. became well 
pronounced; the glands were now blackened. After 5 hrs. 
85 m. all the tentacles closely inflected; after 24 hrs. still 
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