The microscope and its revelations . ibro-vascularbundles, as representedin the diagram, p. 431,interposed between thecentral (or medullary)and the peripheral(or cortical) portionsof the cellular matrix;these fibro - vascularbundles being them-selves separated fromeach other by plates of cellulartissue, which still remain to con-nect the central and the peripheralportions of the matrix. This firststage in the formation of the Exo-genous axis, in which its principalparts—the pith, wood, bark, andmedullary rays—are marked-out, isseen even in the stems of herba-ceous plants, which are destined to
The microscope and its revelations . ibro-vascularbundles, as representedin the diagram, p. 431,interposed between thecentral (or medullary)and the peripheral(or cortical) portionsof the cellular matrix;these fibro - vascularbundles being them-selves separated fromeach other by plates of cellulartissue, which still remain to con-nect the central and the peripheralportions of the matrix. This firststage in the formation of the Exo-genous axis, in which its principalparts—the pith, wood, bark, andmedullary rays—are marked-out, isseen even in the stems of herba-ceous plants, which are destined todie down at the end of the season(Eig. 179); and sections of these,which are very easily prepared, aremost interesting Microscopic ob-jects. In such stems, the differencebetween the Endogenous and theExogenous types is manifested inlittle else than the disposition ofthe fibro-vascular layers; which arescattered through nearly the whole Transverse section of tlie stem of aClimbing-plant (Aristolochia ?) fromNew Zealand. Fig. U.
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