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Show 180 DROSERA ROTUNDIFOLIA. CHAP. VIII. a solution of one part to 875 of water, produced n? apparent cc t Th ere then treated with the same solutwn of car-euec . ey w lt . th f th bonate of ammonia, with the same resu as 1n o case o o nitrate of potash. . . . P t · Phosphate 0-~'.-Half-mmims of a solutwn of one 0 ass~um, u' a· f . l part to 437 of water were placed on the Iscs o· s1x caves, h . h bserved during three days; but no effect was pro-w IC were 0 ·a tl a· l. h I duced . . The partial drying up of the fl.u1 on 1e I~c s Ig t ~ d t ther the tentacles on it, as often occurs 1n expen-rew oge h. d d d ·t ments of this kind. The leaves on the t u ay appearc qm e hoolthy. · 1 t' f Pota.c.sium, C/trate of.-Half-minims of a so u 1on o one part to 437 of water, left on the discs of six leaves fo~ three ~~ys, and the immersion of three leaves for 9 brs.,. each 1n 30 mmims of a solution of one part to 875 of water, did not produce the least effect. . Potassium, Oxalate qf.-Half-minims were placed on different occasions on the discs of seventeen leaves; ~nd the results perplexed me much, as they still do. InflectiOn supervened very l . ly After 24 hrs. four leaves out of the seventeen were well isnofwlec te. d, together with the blades of two; SI.X were sl I' g htl y affected and seven not at all. Three leaves of one lot were observed for five days, and all died; but in another lot of six, all excepting one look~d healthy after f?ur days ... Three leaves were immersed dunng 9 hrs., each 1n 30 m1n~ms of a solution of one part to 875 of water, and were not m the least affected; but they ought to have been observed for a longer time. . . . . Potassium Chloride of. N mther half-m1n1ms of a solutwn of one part to 437 of water, left on the discs of six !eaves for thr~e days, nor the immersion of three leaves during 25 hrs., m 30 minims of a solution of one part to 875 of water, produ~ed the least effect. The immersed leaves were then treated with carbonate of ammonia, as described under nitrate of potash, and with the same result. Potassium, Iodide of.-Half-minims of a solution of one part to 437 of water were placed on the discs of seven leaves. In 30 m. one leaf had the blade inflected ; after some hours th~·ee leaves had most of their submarginal tentacles. modcrat~ly Illfleeted; the remaining three being very slightly . affected. Hardly any of these leaves had their outer tent.acles :nfloctcd. After 21 hrs. all re-expanded, excepting two whiCh still had a few submarginal tentacles inflected. Three loaves were next CHAP. VIII. EF.B'EOTS OF VARIOUS SALTS. 181 immersed for 8 Ins. 40 m., each in 30 minims of a solution of one part to 875 of watm·, and wore not in the least affected. I do ~ot. know what to c~nc~ude from this conflicting evidence; but 1t 1s clear that the 10d1de of potassium does not generally produce any marked effect. Potass,ium, Brom'ide of-Half-minims of a solution of one part to 437 of water ~ere placed on the discs of six leaves; after 22 hrs. one had 1ts blade and many tentacles inflected but I suspect that an insect might have alighted on it and then escaped; the five other leaves were in no way affected. I tested three of these leaves with bits of meat, and after 24 hrs. they became splendidly inflected. Three leaves were also immersed for 21 hrs. in 30 minims of a solution of one part to 875 of water; but they were not at all affected, excepting that the glands looked rather pale. . Lithium, A~et~te o(.-F?~r leaves were immersed together in a vessel contmnmg 120 m1mms of a solution of one part to 437 of water; s~ that each received, if the leaves absorbed equally, T-6 of a gr::un. After 24 hrs. there was no inflection. I then ad.ded, for the sake of testing the leaves, some strong solution (viz. 1 gr .. to 20 oz., or one part to 8750 of water) of phosphate of ammonia, and all four became in 30m. closely inflected. Lithium, Nitrate of.-Four leaves were immersed, as in the la~t case, in 120 minims of a solution of one part to 437 of water; after 1 h. 30 1n. all four were a little, and after 24 hrs. greatly, inflected. I then diluted the solution with some water, but they still remained so mew hat inflected on the third day. Ccesium, Chloride of.-Four leaves were immersed as above in 120 minims of a solution of one part to 437 of ~ater. After 1 hr. 5 m. the glands were darkened; after 4 hrs. 20m. ther-e was a trace of inflection ; after 6 hrs. 40 m. two leaves were greatly, but not closely, and the other two considerably inflected. Aft~r 22 hrs: the inflection was extremely great, and two had their blades Inflected. I then transferred the leaves into water and in 46 hrs. from their first immersion they were almost re~ expanded. Rubidium, Ohloride of.-Four leaves which were immersed as above, in 120 minims of a solution of one part to 437 of water were .not acted on in 22 hrs. I then added some of the stron~ solutwn (l gr. to 20 oz.) of phosphate of ammonia, and in 30m. all were immensely inflected. Silver, 1-litrate qf.- Three leaves were immersed in ninety |