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Show 178 DROSERA ROTUNDIFOLIA. CHAP. VIII. tl were not at all affected in of four leaves. . Two, appar~~nla'cles slightly inflected; whilst 48 hrs.; the thud had It~ t tacles inflected in 24 hrs., and the fourth had al~ost all Its ~n ntil the fourth day, and were these did not begin to re-~~: s~venth day. I presume that not perfectly ~xl?anded 0 the salt. Half-minirp.s of a weaker this leaf was InJured bY 437 f water were then dropped on the l t · f e part to · 0 sou wn, o on h rec'e ived · I ---1; - of a gram. n discs of six leaves, so \~~~t e~~flection; and()~fter 5 hrs. 30m. 1 hr. 33m. there wa~ s Igves were considerably, but not closely, the tentacles of all SIX le~5 ll had completely re-expanded, inflected. After 23 hrs. m. ~ . d . · the least lllJUre · and did not appear I~ sed each in thirty minims of a solu- Three leaves were Imm~r t r so that each received l 2 of a tio~ of one part to 875 °te;~ eh~. there was much inflection; gram, or 2 · 02 mg. !f t ·t cles and the blades of all three after 8 hrs. 3? m. all t eFo: ~ther leaves were also imm,ersed were closely Inflected. . . the same amount of salt . 1 1 t' each· receivmg . In t 1e sol~ Ion, . They all soon became mfiected; as before, VIZ. s\ of a gra;n. re-expand, and appeared qnite unafter 48 hrs. they !Jeganl t~ as sufficiently strong to taste injured, though the so u wn w saline. . . lf . ·ms of a solution of one part to Sod-ium, Iod2de oj.-Ha -~~I the discs of six leaves. After 437 of water were pl~~~d their blades and many. tentacles in- 24 hrs. four of them wo had only their submargmal tenta.cles fleeted. The other t . st of the leaves being but httle inflected; the outer ones ~~ m~ aves had nearly re-expanded: affected. After 46 hrs. . e e d each in thirty minims of a Thre~ ~eaves were also ;~:.e~~t~r. After 6 hrs. 30 rn. almost solutwn of one part toh 8 blade of one leaf, were closely inflected. all the tentacles, and t e I lf . . s of a solution of one part to 8od~.u m, B " 'de o" -Fa -mimm ? om't :J. ·x leaves. After 7 hrs. there was 437 ·of water were placed on tshl f tho leaves had their blades · fl t' · fter 22 hrs. ree 0 '" some In ec wn' a . fl t d. tho fourth leaf was very and most of their tentacles ·I~h e~:rdiy at all affected. Three slightly, and the ~fth a~d d s~~ch in thirty mi~ims of a so~ution leaves were also Immerse ' ft 40 m there wa some mflec- . t t 875 of water; a er . bl d of one par o t l f all three leaves and the a es tion; after 4 hrs. the ten ac e\o ere then placed in water, of two were inflected. T~~~ o~a~~:: were almost completely, and after 17 hrs. 3? m. d d. so that apparently they and the third partially' re-expan e ' were not injured. CHAP. VIII. SALTS OF POTASSIUM. 179 Potassium, Carbonate of ·(pure).-Half-minims of a solution of one part to 437 of water were placed on six leaves. No effect was produced in 24 hrs.; but after 48 lus. some of the leaves had their tentacles, and one the blade, considerably inflected. This, however, seemed the result of their being injured; for on the third day after the solution was given, three of the leaves were dead, and one was very unhealthy; tbe other two were recovering, but with several of their tentacles apparently injured, and these remained permanently inflected. It is evident that the 9~0 of a grain of tbis salt acts as a poison. Three loaves were also immersed, each in thirty minims of a solution of one part to 875 of water, though only for 9 hrs.; and, very differently from what occurs with the salts of soda, no inflection ensued. Potassium, Nitrate oj.-Half-minims of a strong solution, of one part to 109 of water (4 grs. to 1 oz.), were placed on the discs of four leaves; two were much injured, but no inflection ensued. Eight leaves were treated in the same manner, with drops of a weaker solution, of one part to 218 of water. After 50 brs. there was no inflection, but two of the leaves seemed injured. Five of these leaves were subsequently tested with drops of milk and a solution of gelatine on their discs, and only one became inflected; so that the solution of the nitrate of the above strength, acting for ·50 hrs., apparently had injured or paralysed the leaves. Six leaves were then treated in the same manner with a still weaker solution, of one part to 437 of water, and these, after 48 hrs., were in no way affected, with the exception of perhaps a single leaf. Three leaves were next immersed for 25 hrs., each in thirty minims of a solution of one part to 875 of water, and this produced no apparent effect. They were then put into a solution of one part of carbonate of ammonia to 218 of water; the glands were immediately blackened, and after 1 hr. there was some inflection, and the protoplasmic contents of the cells bec.ame plainly aggregated. This shows that the leaves had not been much injured by their immersion for 25 hrs. in the nitrate. Potussium, Sulphate qf.-Half-minims of a solution of one part to 437 of water were placed on the discs of six leaves. After 20 hrs. 30m. no effect was produced; after an additional 24 hrs. three remain~d quite unaffected; two seemed injured, and the sixth seemed almost dead with its tentacles inflected. Nevert, lOless, after two additional days, all six leaves recovered. The immersion of three leaves for 24 hrs., each in thirty minims of N 2 |