A companion to the United States pharmacopia; . Fig. 637.—Showing differentsections, r, radial; t, tangential;Is, transverse ; o, oblique. UNITED STATES PHARMACOPOEIA. 1097. Fig. 638.—Transverse Section of Jamaica Quassia. then beat it slightly with a flat stick or side of the knife-handle, webruise and loosen the cambium-cells so that we may slip a tubular piecefrom the solid cylinder ofwood. If we examine thetwo pieces with a lens wefind that we have the pith,the xylem portion of all thefibro-vascular bundles, andthe medullary rays as far asthe cambium, together witha part of the latter, all
A companion to the United States pharmacopia; . Fig. 637.—Showing differentsections, r, radial; t, tangential;Is, transverse ; o, oblique. UNITED STATES PHARMACOPOEIA. 1097. Fig. 638.—Transverse Section of Jamaica Quassia. then beat it slightly with a flat stick or side of the knife-handle, webruise and loosen the cambium-cells so that we may slip a tubular piecefrom the solid cylinder ofwood. If we examine thetwo pieces with a lens wefind that we have the pith,the xylem portion of all thefibro-vascular bundles, andthe medullary rays as far asthe cambium, together witha part of the latter, all inone piece that is commonlyknown as the wood. Thetubular piece is seen to con-sist of the cuticle (epidermisand cork), a layer of paren-chyma, all the phloem por-tions of all the fibro-vascularbundles, the part of the med-ullary rays from the cambiumoutward, and a portion of the cambium along the inner surface of thetube; all this together constituting what is properly,called the bark. In Fig. 629 we see theboundary between wood andbark marked by a light lineand a star. In most plantsthe bark at certain seasonsof the year is easily removedfrom the wood, presentin
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishernewyo, bookyear1884
