. The microscopy of vegetable foods, with special reference to the detection of adulteration and the diagnosis of mixtures . t, and 34, tr; Fig. 37). Beneath the meso-carp is another layer of cells with porous radial walls, but these are trans-versely elongated and, as may be seen in surface view, are arranged not 68 GR/IIN. end to end but side by side in rows. Over the larger part of the surface,the cells arc 100-200/< long and 15-25 u broad, but in the region of theapex they are shorter and more irregular in form. The very distinctlyporous, double side walls are about 7 // thick, but the
. The microscopy of vegetable foods, with special reference to the detection of adulteration and the diagnosis of mixtures . t, and 34, tr; Fig. 37). Beneath the meso-carp is another layer of cells with porous radial walls, but these are trans-versely elongated and, as may be seen in surface view, are arranged not 68 GR/IIN. end to end but side by side in rows. Over the larger part of the surface,the cells arc 100-200/< long and 15-25 u broad, but in the region of theapex they are shorter and more irregular in form. The very distinctlyporous, double side walls are about 7 // thick, but the end and outerwalls are often much thinner, and the end walls are never swollen asin rye. Intercellular spaces sometimes occur at the angles. Treatmentwith alkali imparts a yellow color, but does not appreciably swell the walls. This layer, from the diagnostic standpoint, is the most important ofthe bran tissues. 5. Tube Cells (Figs. 2)Z ^^^ 34 )• Instead of an unbroken layerof cells, the endocarp of wheat, as of most of the cereals, consists of moreor less detached vermiform cells arranged parallel to the axis of the. IlG. 37. Wheat. Surface vitw of cross cells. X300. ( iJ. VVinton.) grain. Oftentimes two adjoining cells are in interrupted contact, withcircular intercellular spaces formed by sharp bends in the walls, suggest-ing that this layer is but disintegrated spongy parenchyma (/«-). Cross-sections of these cells are circular or elliptical. Spermoderm (Fig. TiZ^ ^\ Fig- 34» ^ ^^^ ^)- 1 cross-section, beforetreatmcnl with reagents, the two layers of the spermoderm appear likey;jllow-brown, structureless membranes, the inner somewhat darker thanthe outer; but on treatment with Javelle water, the cell structure canoften be recognized. Owing to their brown color, the layers are readilyfound in surface preparations. The thin-walled, elongated, pointed cellsof the two layers cross one another. Perisperm (Figs, t^t^ and 34, P). The remains of the nuccllus orbody (jf the o
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