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Show 182 DROSERA ROTUNDIFOLIA. CHAP. VIII. mi·n i·m S f luti'on of one part to 437 of water; so that each 0 a SO 5 }' ht · fl · recei·v e d , as be.cor·e of a grain. After m. s 1g m ect10n, 1' , 1 6 • h 1 d b · and after 11 rn. very strong inflectwn, t e g an s ecommg exces.s i·v e1 y black·' after 40 m. all the tentactl es f wthe re c1l os·e ly inflected. After 6 hrs. the loaves were taken ou ? e so ut10n, washed, and placed in water ; but next morning they were evidently dead. . d · 120 · · Caldum, Acr::tute of. -'Four leaves were Immerse In mm1ms of a solution of one part to 437 of ~ater; after 24 hrs. none of the tentacles were inflected, exceptmg a few where the blade joined the petiole ; an ct. this may ha vo been ca l:sed by the absorption of the salt by the cut-off end of the petwle. I then added some of the solution (1 gr. ~o 20 oz.). ~f ph_ospat~ of ammonia, but this to my surprise exCited only sbght InflectiOn, even after 24 hrs. Hence it would appear that the acetate had rendered tb o leaves torpid. . . . . Calcium, Nitrate of.-Four leaves were Immersed 1n 120mimms of a solution of one part to 437 of water, but were not affected in 24 hrs. I then added some of tho solution of phoRphate of ammonia (1 gr. to 20 oz.), but this caused only very sbght inflection. after 24 hrs. A fresh loaf was next put into a mixed solution of the above strengths of the nitr~to of ca~cium and phosphate of ammonia, and it became clo~ely mfloctod In bet:veen 5 m. and 10m. Half-minims of a solutwn of ono part of the nitrate of calcium to 218 of water were dropped on the discs of three leaves, but produced no effect. . Magnesium, Acetate, Nitrate, an_d Chlonde of.-Four loaves were immersed in 120 minims of solutwns, of 0ne part to 437 of water, of each of these three salts; after 6 hrs. thoro was no inflection; but after 22 hrs. one of the leaves in the acetate was rather more inflected than generally occurs from an immersion for this leno-th of time in water. Some of the solution (1 gr. to 20 oz.) of ;hosphate of ammonia was then added to tho three solutions. The loaves in the acetate mixed with tho phosphate underwent some inflection · and this was well pronounced after 24 hrs. Those in the ~ixed nitrate were decidedly inflected in 4 hrs. 30 m. but the degree of inflection did not afterwards mnch incre;se; whereas the four leaves in the mixed chloride were greatly inflected in a few minutes, and after 4 lus. had almost every tentacle closely inflected. W o thus soc that the acetate and nitrate of magnesium injure tho leaves, or at least prevent the subsequent action of phosphate of ammonia; whereas the chloride has no such tendency. CHAP. VIII. EFFECTS OF VARIOUS SALTS. 183 Magnesium, Sulphate of.-Half-minims of a solution of one part to 218 of water were placed on the discs of ten leaves, and produced no effect . Barium, Acetate rf.-Four leaves were immersed in 120 minims of a solution of one part to 437 of water, and after 22 hrs. there was no inflection, but the glands were blackened. The leaves were tb~n pla?ed in a solution (1 gr. to 20 oz.) of phosphate of ammoma, whwh caused after 26 hrs. only a little inflection in two of the leaves. Barium, Nitrate o/.-Four leaves were immersed in 120 minims of a solution of one part to 437 of water; and after 22 hrs. there was no more than that slight degree of inflection, which often follows from an immersion of this length in pure water. I then added some of the same solution of phosphate of ammonia, and after 30 m. one leaf was greatly inflected, two others moderately, and the fourth not at all. The leaves remained in this state for 24 brs. StTonti~tm, Acdate of.-Four leaves, immersed in 120 minims of a solution of one part to 437 of water, were not affected in 22 hrs. They were then placed in some of the same solution of phosphate of ammonia, and in 25 m. two of them were greatly inflected; after 8 brs. the third leaf was considerably inflected, and the fourth exhibited a trace of inflection. They were in the same state next morning. Strontium, Nitrate of.-Five leaves were immersed in 120 minims of a solution of one part to 437 of water; after 22 brs. there was some slight inflection, but not more than sometimes occurs with leaves in water. They were then placed in the same solution of phosphate of ammonia; after 8 hrs. three of them were moderately inflected, as were all five after 24 hrs.; but not one was closely inflected. It appears that the nitrate of strontium renders the leaves half torpid. Cadmium, Chloride qf:-Three leaves were immersed in ninety minims of a solution of one part to 437 of water; after 5 hrs. 20 m. slight inflection occurred, which increased during the next three hours. After 24 hrs. all three leaves bad their tentacles well inflected, and remained so for an additional 24 hrs. ; glands not discoloured. · MeTcury, Perchloride of.-Three leaves were immersed in ninety minims of a solution of one part to 437 of water; after 22m. there was some slight inflection, which in 48 m. became well pronounced; the glands were now blackened. After 5 brs. 35 m. all the tentacles closely inflected; after 24 hrs. still |