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Show 214 DROSERA ROTUNDIFOLIA. CHAP. IX. and then placed in the phosphate solution : in 2 hrs. 15 m. there was a trace of inflection in one leaf, and in 5 hrs. 30m. a second was slightly affected; the inflection subsequently increased though slowly. Hence diluted alcohol, which, as we shall see i~ hardly at all poisonous, plainly retards the subsequent actiod of the phosphate. It was shown in the last chaptm· that leaves which did not become inflected by nearly a day's immersion in solutions of varjous Ral ts a.nd acids behaved very differently from one another when subsequently placed in the phosphate solution. I here give a table summing up the results. Period of I Immersion Effects produced on tbe Leaves by their 8nbsc-of the qnPnt. Immersion fur stated periods in a Name of tbe • alts and Acids in Solution. Leaves in SolutiCofol of one part of pho~phate of Solutio11s ammoma to 8750 of water, or 1 gr. to of one part 20 oz. to 437 of water. Hubidium chloride . 22 hrs. Pota ·sium carbonate 20 m. Calcium acetate . 24 Jus. Calcium nitrate . . 24 hrs. Mag-nesium acetate. 22 hrs. Magno. ium nitrate . 22 Jus. l\1agnesium chloride 22 Ius. Barium acetate • . 22 hrs. Barium nitrate . 22 hrs. ~·trontium acetate • 22 hrs. . Strontium nitmte . 22 hrs. Aluminium chloride 24: Ius. After 80 m. strong inflection of the tentacles. Scarcely :my inflection until 5 hr~:; . had ela p eel. After 24 hrs. very slight inflection. Dn. do. Some slight inflection, wl1ich becam·c well pronounced in 24 hrs. After 4 hrs. BO m. a fair amount of inflection, which novm· incrom;ed. After a few minute groat inflection ; after4 hrs. all four leaves with almm;t every tentarlo closely inflected. After 24 hrs. two loaves out of four slightly inflected. After 30 m. one leaf greatly, and. t\vo other_s moderately, inflected; they remamed thus for 2'! Ius. After 25 m. two leaves greatly inflected; after 8 hrs. a third loaf m?derato~y, and tho foul'th very slightly, mflectocl. All four thus remained for 24 hrs. After 8 hrs. threo leaves out of five moderately inflected ; after 2-1: }us. all five in this state; but not one closely inflected. Three leaves whit·h had either been slightly or not at all affected by tho chloride became after 7 hrs. 30 m. rather closely inflected. CnAr. IX. EFFECTS OF PREVIOUS ll\11\IER ION. 215 Name of the Salts and Acids in Solution. Period of hamer ion of th Laves in Solutions of one p·trt to 437 of water. Aluminium nitrate. 24 hrs. Lead chloride . . 23 Ius. Manganese chloride 22 hrs. Lactic ,acid . 48 hrs. · Tannic acid . Tartaric acid Citric acid . Formic acid . . 24 hrs. . 24 hrs. 24 hrs. . 22 hrs. Effect produc d on the J~ctwe by their RuhRequ >nt Jmm r i n for stated period in a Solution of on part of pho phate or ammonia to 8750 of wu.ter, or 1 gr. to 20 oz. Aft r 25 hr . slight and doubtful effect. After 24: lus. two leaves somewhat inflected, tho third very little; and thus remained. After 48 hrs. not tho least inflection. After 24 hrs. a trace of inflection in a few tentacle , tho glandi:l of which had not been killed by the acid. After 24 hrs. no inflection . Do. do . After 50 m. tentacles decidedly inflected, and after 5 hrs. strongly inflected ; so remained for tho next 24: hrs. Not observed until24 hrs. had elapsed; tentacles considerably inflected, and protoplasm aggregated. In a large majority of these twenty cases, a varying degree of inflection was slowly caused by the phosphate. In four cases, however, the inflection was rapid, occurring iu less than half an hour or at most in 50 m. In three cases the phosphate did not produce the least effect. Now what are we to infer from these facts? We know from ten trials that immersion in distilled water for 24 hrs. prevents the subsequent action of the phosphate solution. It would, therefore, appear as if the solutions of chlorid~ of manganese, tannic and tartaric acids, which are not poisonous, acted exactly like water, for the phosphate produced no effect on the leaves which bad been previously immersed in these three solutions. The majority of the other solutions behaved to a certain extent like water, for the phosphate produced, after a considerable interval of time, only a slight effect. On the other hand, the leaves which bad been immersed in the solutions of the chloride of rubidium and magnesium, of acetate of strontium, nitrate of barium, and citric acid, were quickly acted on by the phosphate. Now was water absorbed from these five weak solutions, and yet, owing to the presence of the salts, did not prevent the subsequent action of tho phosphate? Or |
