Cuav. VIII.J SALTS OF SODIUM. 145 
clear that sly of a grain of phosphate of soda has great power in 
causing inflection. 
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 submarginal 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. four of the leaves were almost re-expanded, including their blades. 
'lhree leaves were also immersed, each in thirty mivims 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 487 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 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 or 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 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 ten- 
tacles 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 51,5 of a grain. In 1 hr. 33m. 
there was slight inflection; and after 5 hrs. 80 m. the tentacles of 
all six leaves were considerably, but not closely, inflected. After 23 
hrs. 15 m. all had completely re-expanded, and did not appear in the 
deast injured. 
Three leaves were immersed, each in thirty minims of a solution of 
one part to 875 of water, so that each received 3, of a grain, or 2°02 
mz. After 1 hr. there was much inflection; after 8 hrs. 30 m. all the 
tentacles and the blades of all three were closely inflected. Four other 
leaves were also immersed in the solution, each receiving the same 
amount of salt as before, viz. 3, of a grain. They all svor became 
inflected; after 48 hrs. they began to re-expand, aud appeared quite 
uninjured, though the solution was sufficiently strong to taste saline. 
Sodium, Iodide of.—Half-minims of a solution of one part to 487 of 
watcr were placed on the discs of six leaves. After 24 hrs. four of them 
had their blades and many tentacles inflected. The other two had 
only their submarginal tentacles inflected; the outer ones in most of 
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