. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. ordered pit R, radial section C, cross section S, sapwoodCm, cambium Sm, summerwood CRC, central ray cell Sp, springwood D, resin duct or canal SP, simple pit F, fibro-vascular bundle T, tangential section H, heartwood Tr, tracheidK, bark V, vessel or pore L, middle lamella W, wood M, medullary ray WF, wood fiberMRC, marginal ray cell 5. Structure of Stem of Clematis.—A cross section of the stemof clematis is shown in Fig. 2; this is typical of the general make-up of common plants that die at the end of ea
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. ordered pit R, radial section C, cross section S, sapwoodCm, cambium Sm, summerwood CRC, central ray cell Sp, springwood D, resin duct or canal SP, simple pit F, fibro-vascular bundle T, tangential section H, heartwood Tr, tracheidK, bark V, vessel or pore L, middle lamella W, wood M, medullary ray WF, wood fiberMRC, marginal ray cell 5. Structure of Stem of Clematis.—A cross section of the stemof clematis is shown in Fig. 2; this is typical of the general make-up of common plants that die at the end of each year. As canbe seen, the fiber bundles are arranged in a single circle in theouter part of the stem. The part fitting like a cap over eachbundle is the group of bast fibers, while the rest of the bundleincludes short, more or less woody fibers. The hollow centerof the stem is surrounded by pith cells, which, like those of Indiancorn, are very short and thin. Here, again, only the bast fibersare useful for paper pulp, and the proportion of these is so small §1 PROPERTIES OF WOOD. Fig. 2.—Cross Section of Clematis Stem. X 20. (Prepared by the Forest Products Laboratories of Canada.)In this and similar plants, the only parts of value for paper pulp are the bast fibers B,which show as caps fitting on each fibro-vascular bundle F. The parenchyma (pith) cellsP and the cells of the bundles, with the exception of the bast cells, are of little or no value.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1921
