Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 678
Fig. 489.—Portion of vertical section of thesame wood, taken in a radial direction,showing the tracheides with borderedpits, without ducts, crossed by the medul-lary rays, a, a. … I fit I Fig. 490.—Portion of verticalsection of the same wood,taken in a tangential direc-tion, so as to cut across themedullary rays. In another fossil wood, whose transverse section is shown infig. 492, and its tangential section in fig. 493, the medullary raysare seen to occupy a much larger…
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