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Show 176 DROSERA ROTUNDIFOLIA. CHAP. VIII. Sodium Carbonate of (pure, given me by. Prof. Ho:ffmann).Half- mini~s (' 0296 mi.) of a solution of one part to 218 of water (2 grs. to 1 oz.) were placed on the discs of twelve leaves. Seven of these became well inflected ; three had only two or three of their outer tentacles inflected, and the remaining two were quite unaffected. But the dose, though only the 4 -h- of a grain ( ·135 mg.), was evidently too strong, for three of the seven well-inflected leaves were killed. On the other hand, one of the seven, which had only a few tentacles inflected, re· expanded and seemed quite healthy after 48 hrs. By employj:ng a weaker solution (viz. one part .to 437 of water, or 1 gr. to 1 oz.) doses of -:-J;.- of a grain ( · 0675 mg.) were given to six leave~. Some of th~se were afJected in 37m.; and in 8 brs. the outer tentacles of all, as well as the blades of two, were con· siderably inflected. After 23 hrs. 15 m. the tentacl~s ~ad almost re-expanded, but the blades of the two :were still JUSt perceptibly curved inwards. After 48 hrs. all SIX leaves were fully re-expanded, and appeared perf~ctly .healt~Y·. Three leaves were immersed, each In thuty minims of a solution of one part to 875 of water (1 gr. to 2 oz.), so that each received 3\ of a grain (2 · 02 mg.); after 40 m. the three were n1uch affected, and after 6 hrs. 45 m. the tentacles of all and the blade of one closely inflected. Sodium, NitTate of (pure).-Half-minims of a solution of one part to 437 of water, containing 9~ 0 of a grain (' 0675 mg.), were placed on the discs of five leaves. After 1 hr. 25m. the tentacles of nearly all, and the blade of one, were somewhat inflected. The inflection continued to increase, and in 21 hrs. 15 m. the tentacles and the blades of four of them were greatly affected, and the blade of the :fifth to a slight extent. After an additional 24 hrs. the four leaves still remained closely inflected, whilst the fifth was beginning to expand. Four days after the solution had been applied, two of the leaves had quite, and one had partially, re-expanded; whilst the remaining two remained closely inflected and appeared injured. Three leaves were immersed, each in thirty minims of a solu~ tion of one part to 875 of water; in 1 hr. there was great inflec· tion, and after 8 hrs. 15 m. every tentacle and the blades of all · three were most strongly inflected. Sodium, Sulphate of.-Half-minims of a solution of one p~rt to 437 of water were placed on the discs of six leaves. After 5 hrs. 30m. the tentacles of three of them (with the blade of one) were considerably, and those of the other three slightly, inflected. After 21 hrs. the inflection had a little decreased, CHAP. VIII. SALTS OF SODIUM. 177 and in 45 hrs. the leaves were fully expanded, appearing quito healthy. . Three Jeavm were immersed, each in thirty minims of a solutiOn of one part of the sulphate to 875 of water; after 1 hr. ~0 m. there was some inflection, which increased so much that In 8 hrs. 10 I?· 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 4~7 of water. were placed on the discs of six leaves. The solutiOn acted With extraordinary rapidity, 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 -L of a grm.n of p h osp h a t e of so d a has great power in caus9i6n0g 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. bad elapsed. The submarginal te~tacles 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 l~aves were almost re-expanded, including their blades. Three leaves were also immersed, each in thirty minims of a solution of one par~ 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 th~ 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 or' them were much affected. In 22 hrs., besides the inflection of th~ tentacles, the blades of all seven leaves were so much ~oubled over that their tips and bases almost touched. On no other occasion have I seen the blades so strongly affected. ThTee leaves were also immersed, each in thirty minims of a solution of one part to 875 of water; after 30m. there was much inflection and after 6 hrs. 35 m. the blades of two and the tentacles of ali were closely inflected. So~iurn, Chloride of (best culinary salt).-Half-minims of a so1utwn of one part to 218 of wateT were placed on the disc~ N |