Chjlp.VIIL] effects OF VARIOUS SALTS. 149 



the above strengths of the nitrate of calcium and phosphate of am- 

 monia, and it tecame closely inflected in between 5 m. and 10 m. 

 Ualf-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 pro- 

 duced 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 inflec- 

 tion; 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 pronounmi 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 efl"ect. 



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 oz.) 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 minima 

 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 fol- 

 lows 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 aflTected in 22 

 hrs. They were then placed in some of the same solution of phos- 

 phate of ammonia, and in 25 m. two of them were greatly inflected ; 

 after 8 hrs. the third leaf was considerabl}' 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 min- 

 ims of a solution of one part to 437 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 moder- 

 ately inflected, as were all five after 24 hrs.; but not one was 



