CuAP. Vm. SALTS OF SODIUM. 177 



and in 45 hrs. the leaves were fully expanded, appearing quite 

 healthy. 



Three leaves were immersed, each in thirty minims of a solu- 

 tion of one part of the sulphate to 875 of water ; after 1 hr. 

 30 m. there was some inflection, which increased so much that 

 in 8 hrs. 10 m. all the tentacles and the blades of all three leaves 

 were closely inflected. 



Sodium, Phosphate of. — Half-minims of a solution of one part 

 to 437 of water were placed on the discs of six leaves. The 

 solution acted with extraordinary rajjidity, for in 8 m. the outer 

 tentacles on several of the leaves were much incurved. After 

 6 hrs. the tentacles of all six leaves, and the blades of two, were 

 closely inflected. This state of things continued for 24 hrs., 

 excepting that the blade of a third leaf became incurved. After 

 48 hrs. all the leaves re-expanded. It is clear that -^ of a 

 grain of phosphate of soda has great power in' causing in- 

 flection. 



Sodium, Citrate of. — Half-minims of a solution of one part to 

 437 of water were placed on the discs of six leaves, but these 

 were not observed until 22 hrs. had elapsed. The sub- 

 marginal tentacles of five of them, and the blades of four, were 

 then found inflected; but the outer rows of tentacles were not 

 affected. One leaf, which appeared older than the others, was 

 very little affected in any way. After 46 hrs. foui* of the leaves 

 were almost re-expanded, including their blades. Three leaves 

 were also immersed, each in thirty minims of a solution of one 

 part of the citrate to 875 of water; they were much acted 

 on in 25 m. ; and after 6 hrs. 35 m. almost all the tentacles, 

 including those of the outer rows, were inflected, but not the 

 blades. 



Sodium, Oxalate of. — Half-minims of a solution of one part to 

 437 of water were placed on the discs of seven leaves; after 

 5 hrs. 30 m. the tentacles of all, and the blades of most of them, 

 were much affected. In 22 hrs., besides the inflection of the 

 tentacles, the blades of all seven leaves were so much doubled 

 over that their tips and bases almost touched. On no other 

 occasion have I seen the blades so strongly affected. Three 

 leaves were also immersed, each in thirty minims of a solution of 

 one part to 875 of water ; after 30 m. there was much inflection, 

 and after 6 hrs. 35 m. the blades of two and the tentacles of all 

 were closely inflected. 



Sodium, Chloride of (best culinary salt). — Half-minims of a 

 solution of one part to 218 of water were placed on the discs 



