Insectivorous plants . sameplants for simultaneous immersion in water. It often happenedthat some leaves on the same plant, and some tentacles on thesame leaf, were more sensitive than others; but why this shouldbe so, I do not the differences just indicated between the leaves im-mersed in water and in weaksolutions of ammonia, the ten-tacles of the latter are in mostcases much more closely in-flected. The appearance of aleaf after immersion in a fewdrops of a solution of one grainof phosphate of ammonia to200 oz. of water ( one partto 87,500) is here reproduced :such energeti
Insectivorous plants . sameplants for simultaneous immersion in water. It often happenedthat some leaves on the same plant, and some tentacles on thesame leaf, were more sensitive than others; but why this shouldbe so, I do not the differences just indicated between the leaves im-mersed in water and in weaksolutions of ammonia, the ten-tacles of the latter are in mostcases much more closely in-flected. The appearance of aleaf after immersion in a fewdrops of a solution of one grainof phosphate of ammonia to200 oz. of water ( one partto 87,500) is here reproduced :such energetic inflection isnever caused by water leaves in the weak solu-tions, the blade or lamina oftenbecomes inflected; and this isso rare a circumstance withleaves in water that I haveseen only two instances; andin both of these the inflec-tion was very feeble. Again,with leaves in the weak solu-tions, the inflection of the ten-tacles and blade often goes onsteadily, though slowly, increasing during many hours; and. (^Drosera rotundifoUa.) Leaf (enlarged) with all the tentacles closely inflected, from immersion in a solution of phosphate of ammonia (one part to 87,500 of water). Chap. yil. CAEBONATE OF AMMONIA. 141 tliis again is so rare a circumstance with leayes in water thatI have seen only three instances of any such increase after tliefirst 8 to 12 hrs.; and in these three instances the two outerrows of tentacles were not at all affected. Hence there is some-times a much greater diiference between the leaves in water andin the weak solutions, after from 8 hrs. to 24 hrs., than therewas within the first 3 hrs.; though as a general rule it is bestto trust to the difference observed within the shorter time. With respect to the period of the re-expansion of the leaves,when left immersed either in water or in the weak solutions,notliing could be more variable. In both cases the exteriortentacles not rarely begin to re-expand, after an interval ofonly from 6 to 8 hrs.; that
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