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- W2023961292 abstract "IN the insectivorous plants of the genus Nepenthes, a form represented by a number of species and widely distributed over the Indian and Australian regions, as well as in Madagascar, the pitchers or insect-traps, which are usually regarded as expansions of the leaf-stalk, are suspended, mouth upwards, at the ends of long tendrils proceeding from the tips of the leaves. The gaping orifice, frequently strengthened and kept open by a thickening of the rim, is protected by a lid, which, while preventing the infall of rain, offers no obstruction to the free entrance of insects. To attract the attention of these animals the pitchers are frequently conspicuously coloured in their upper parts, and honey is secreted from glands scattered around the margin of the aperture and on the under-face of the lid. This gaudy and sweetened portion, designed as it is to catch the eye and act as a bait, constitutes the “attractive” area. A short distance within the cavity and below the attractive area just described, the walls of the pitcher are smooth and of a waxy consistency, so that no foothold is afforded to insects, which are consequently precipitated to the bottom of the pitfall if luckless or incautious enough to venture on this “conductive” area. The lower part of the receptacle is filled to a greater or less extent with a fluid containing, amongst other substances, potassium chloride, malic and citric acids, as well as soda lime and magnesia in smaller quantities and an enzyme, which in the presence of the acids has the power of digesting organic matter (S. H. Vines; quoted by “A. W. B,” NATURE, vol. lvii. pp. 367–368, 1898). This fluid, poured out as a secretion from a large number of glands developed in the adjacent walls of the pitcher, is usually crowded with the indigestible remains of insects, commingled with those of which the nutritious tissues are in process of decomposition under the action of the alimentary juice of the plants and of the bacteria which infest it." @default.
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- W2023961292 date "1898-07-01" @default.
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- W2023961292 title "Spider and Pitcher-Plant" @default.
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- W2023961292 doi "https://doi.org/10.1038/058274a0" @default.
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