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Show BARK ON TREES NOT WOOD It Is Composed of Three Layer of Tissues, Tis-sues, Cach of Which Has Important Impor-tant Function. Ilnrk on trees nnd shrnbs corresponds corre-sponds with skin on animals. Bat It has other uses which tho skin hasn't Hark Isn't wood, and It Isn't farmed as wood Is formed. It covers the vood, nnd It Is generally an easy rnattir to separato the bark from tbepod. Ilcnip nnd Jute and QnxtWfJpWrfc the outaldo covering of certain vege-tablo vege-tablo growths. Itnrk Is composed of throe layers of tissues. Tho inside layer conducts food to the plant, nnd under a magnifying mag-nifying glass Is seen to bo made up of tiny fibers. Then there Is tho "green zone," as It Is called, and this also Is fibrous, nnd helps feed tho plant. The outside layer Is cork, and Is really dend. That Is, theso cork cells develop devel-op nnd dlo Immediately, so one really Mes only a dead tree when ho looks nt tho bark. The cork of commerce Is the bark of a certain kind of tropical trop-ical tree, but the outer luyer ot bark of all trees Is technically known ns cork, and the llttlu cells going to make It up nre called cork. |