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THE SEEDLING AND YOUNG PLANT.
Fig. 15.— Tangential longitudinal section of wood of oak (highly magnified). To the left is a large medullary ray (M.Str), and numerous small ones are seen in various parts of the section—of course, in transverse section. Librf, wood-fibers; Gef, smaller pitted vessels; Trach, tracheids; H.P., wood-parenchyma. (Kny.)