. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. USE OF CORK IN HEALING WOUNDS 71 general terms from our experience with cork stoppers, namely that fluids in a state of vapor are practically unable to penetrate them. Use of Cork in Healing Wounds.—In case of injury to stems and roots, as when the bark is gnawed or branches are broken off by storms or pruned away, the parenchyma cells of the cortex and peri- cycle in the region of the wound form secondary meristems by cell division, which build the various tissues
. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. USE OF CORK IN HEALING WOUNDS 71 general terms from our experience with cork stoppers, namely that fluids in a state of vapor are practically unable to penetrate them. Use of Cork in Healing Wounds.—In case of injury to stems and roots, as when the bark is gnawed or branches are broken off by storms or pruned away, the parenchyma cells of the cortex and peri- cycle in the region of the wound form secondary meristems by cell division, which build the various tissues of the bark until the wound is closed over and form a new cambium layer where that has been torn away, and a phellogen which generates an exterior covering of cork. When leaves ripen and fall away the cells at the surface of the wound become suberized and are in effect cork cells. The relative dependence of the differ- ent parts of a plant on epidermis and cork is shown dia^rammatically in Fig. 35. The fact that a waterproofed epi- dermis does not occur at the growing apex is indicated by a very thin line. As the epidermis becomes better devel- oped on the successively older leaves and portions of stem and root the line is thickened. The evanescent flower does not demand as effective an epi- dermis as the leaves and stem, and this is here indicated by its thin outline. The pistil persists, and as it develops into the fruit it perfects its epidermis as a waterproof covering, as indicated by the thick outline of the fruit in the diagram. Finally on the older portions of stem and root cork appears (the barred zone in the diagram) and gradu- ally increases until it bursts the epidermis, and after a time takes its place Fig. 35.—Diagram illustrat- ing the relative development of the protective tissues in differ- ent parts of a plant. Descrip- tion in the Please note that these images are extracted from scanned page images that may have been digitally enhance
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