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 [page 178] 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 1/960 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 considerably, but not closely, inflected.  After 23 hrs. 15 m. all had completely re-expanded, and did not appear in the least injured.

Three leaves were immersed, each in thirty minims of a solution of one part to 875 of water, so that each received 1/32 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 were closely inflected.  Four other leaves were also immersed in the solution, each receiving the same amount of salt as before, viz. 1/32 of a grain.  They all soon became inflected; after 48 hrs. they began to re-expand, and appeared quite uninjured, though the solution was sufficiently 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 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 the leaves being but little affected.  After 46 hrs. the leaves had nearly re-expanded.  Three leaves were also immersed, each in thirty minims of a solution of one part to 875 of water.  After 6 hrs. 30 m. almost all the tentacles, and the blade of one leaf, were closely inflected.

Sodium, Bromide of.—­Half-minims of a solution of one part to 437 of water were placed on six leaves.  After 7 hrs. there was some inflection; after 22 hrs. three of the leaves had their blades and most of their tentacles inflected; the fourth leaf was very slightly, and the fifth and sixth hardly at all, affected.  Three leaves were also immersed, each in thirty minims of a solution of one part to 875 of water; after 40 m. there was some inflection; after 4 hrs. the tentacles of all three leaves and the blades of two were inflected.  These leaves were then placed in water, and after 17 hrs. 30 m. two of them were almost completely, and the third partially, re-expanded; so that apparently they were not injured. [page 179]