. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. Fig. 65.—Protection of Stomata from Moisture by Papilla-like outgrowths of the Surface. i Vertical section through a portion of the leaf of Glycerin spectabilis. 2 Vertical section through a portion of the leaf of Carex paludosa; X200. adheres to it. On placing a vessel of water, in which some bamboo leaves are half immersed, under the receiver of an air-pump, and then pumping out the air, numerous small air-bubbles are at once given off from the submerged portions of the leaves. At length the silver
. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. Fig. 65.—Protection of Stomata from Moisture by Papilla-like outgrowths of the Surface. i Vertical section through a portion of the leaf of Glycerin spectabilis. 2 Vertical section through a portion of the leaf of Carex paludosa; X200. adheres to it. On placing a vessel of water, in which some bamboo leaves are half immersed, under the receiver of an air-pump, and then pumping out the air, numerous small air-bubbles are at once given off from the submerged portions of the leaves. At length the silvery lustre disappears, and the air between the cuticular pegs is replaced by water. If now the leaves be completely submerged, the silver lustre is only shown on those parts which were not previously immersed, and where water could not replace the exhausted air;—the spaces round the pegs in this region having been again supplied with air on,the opening of the stop-cock of the pump in order to submerge the leaves. It may be imagined from this experiment how much the stomata would be damaged by water if the plants mentioned were not protected from moisture by the pegs to which the air adheres so strongly. In many plants which grow in the sunshine, and particularly in those whose foliage is evergreen and only exposed to moisture at the time of the greatest activity of the sap (while later it is exposed for months to dry air), the stomata are to be found surrounded by an embankment, or sunk in special pits and furrows. Even in the leaves of many indigenous plants, which are green in the summer, those of the Carrot (Daucus Garota), the guard-cells of the stomata are so. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kerner von Marilaun, Anton, 1831-1898; Oliver, F. W. (Francis Wall), 1864-1951; Busk, Mari
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1895
