The microscope and its revelations . species, the uppersurface of whose leaves is entiiely destitute of these Iris germanica, each surface has nearly 12,000 stomata inevery square inch; and in Yucca, each surface has 40,000.—In Oleander, Banksia, and some other plants, the stomatado not open diiectly upon the lower surface of the cuticle,but lie in the deepest part of little pits or depressions whichare excavated in it, and which are lined with hairs; themouths of these pits, with the haiis that line them, are wellbrought into view by taking a thia sHce from the surface of Portion of
The microscope and its revelations . species, the uppersurface of whose leaves is entiiely destitute of these Iris germanica, each surface has nearly 12,000 stomata inevery square inch; and in Yucca, each surface has 40,000.—In Oleander, Banksia, and some other plants, the stomatado not open diiectly upon the lower surface of the cuticle,but lie in the deepest part of little pits or depressions whichare excavated in it, and which are lined with hairs; themouths of these pits, with the haiis that line them, are wellbrought into view by taking a thia sHce from the surface of Portion of tte Cuticle of the leaf of the Irisgermanica, torn from its surface, and carryingaway with it a portion of the parenchymatouslayer in immediate contact with it:—a, a, elon-gated cells of the cuticle; b, b, cells of the stomata;c, c, cells of the parenchyma; d, d, impressionsformed by their contact, on the epidermic cells;e, e, lacunae in the parenchj-ma, corresponding tothe stomata. Ijs^teenal structure of leaves. 449 Fig. > the cuticle with a sharp knife; but the form of the cavities,and the position of the stomata, can only be well made-out invertical sections of the leaves. 249. The internal structuic of Leaves is best brought intoview by making vertical sections, that shall traverse the twolayers of cuticle and the intermediate cellular parenchyma;portions of such sections are shown in Figs. 184, 186, and187. In close apposition with the cells of the upper cuticle(Fig. 186, a, a), which may or may not be perforated withstomata {c, c, d, d), we find a layer of soft thin-walledcells, containinga large quantityof chlorophyll;these cells usu-ally press soclosely againstone another, thattheir sides be-come mutuallyflattened, and nospaces are left,save where thereis a definite air-chamber intowhich the sto-ma opens (, l); and thecompactness ofthis superficiallayer is well seen, when, as often happens, it adheres so closely to thecuticle, as to be carried-away
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