Chap. VIII.] SALTS OF SODIUM. 145 



Sodiuvi, Xitrate 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 submarginal tenta- 

 cles of five of them, and the blades of four, were then found in- 

 flected; but the outer rows of tentacles were not affected. One 

 leaf, wliich appeared older than the others, was very little affected 

 in any way. After 46 hrs. four of the leaves were almost re- 

 expanded, including their blades. Three leaves were also im- 

 mersed, 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 disc 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 im- 

 mersed, each in thirty minims of a solution of one part to 875 of 

 water; after 30 m. there was much inflection, and after 6 In-s. 

 35 m. the blades of two and the tentacles of all were closely in- 

 flected. 



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

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

 four leaves. Two, apparently, were not at all affected in 48 hrs.; 

 the third had its tentacles slightly inflected ; whilst the fourth had 

 almost all its tentacles inflected in 24 hrs., and these did not begin 

 to re-expand until the fourth day, and were not perfectly expanded 

 on the seventh day. I presume that this leaf was injured by the 

 salt. Half-minims of a weaker solution, of one part to 437 of 

 water, were then dropped on the discs of six leaves, so that each 

 received y^-g of a grain. In 1 hr. 33 m. there was slight inflection ; 

 and after 5 hrs. 30 m. the tentacles of all six leaves were consider- 

 ably, but not closely, inflected. After 23 hrs. 15 m. all had com- 

 pletely re-expande<l, and did not appear in the least injured. 



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

 tion of one part to 875 of water, so that each received ^ of a grain, 

 or 2.02 mg. After 1 hr. there was much inflection; after 8 hrs. 

 30 m. all the tentacles and the blades of all three Avere closely in- 

 flected. Four other leaves wer^also immersed in the solution, each 

 receiving the same amoimt of salt as before, viz. ^'y of a grain. 

 They all soon became inflected ; after 48 hrs. they began to re-ex- 

 pand, and appeared quite uninjured, though the solution was sufK- 

 ciently strong to taste saline. 



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

 437 of water were placed on the discs of six leaves. After 24 hr. 

 four of them had their blades and many tentacles inflected. The 

 other two had only their submarginal tentacles inflected; the outer 

 one in most of the leaves being but little affected. After 4fi hrs. 

 the leaves had nearly re-expanded. Three leaves were also im- 



