. The theory of evolution in the light of facts. tive. ^ ^ Formationshunde, p. 21. The evidence was mainly provided byWeinschenk. ^ A. Schenk, in Zittels Handbuch V, p. 233. By this the existenceof vascular plants was indicated. More details cannot, however, berecognized owing to the great decomposition of the materials. ^ The veinlets are bundles of conducting vessels by which water andearthy salts in solution are carried to the assimilating tissues. 4 More details are given in § 3, where we shall treat of the differentia-tion of the fern type. 54 THE THEORY OF EVOLUTION To all appearance the
. The theory of evolution in the light of facts. tive. ^ ^ Formationshunde, p. 21. The evidence was mainly provided byWeinschenk. ^ A. Schenk, in Zittels Handbuch V, p. 233. By this the existenceof vascular plants was indicated. More details cannot, however, berecognized owing to the great decomposition of the materials. ^ The veinlets are bundles of conducting vessels by which water andearthy salts in solution are carried to the assimilating tissues. 4 More details are given in § 3, where we shall treat of the differentia-tion of the fern type. 54 THE THEORY OF EVOLUTION To all appearance there also already existed in theSilurian era the predecessors of the Sigillaria (whichdeveloped later so richly in the Carboniferous) (Figs. 12and 13) in the form of Bothrodendrse, if the age of the localities of the finds (Harz) becorrectly estimated. Even Gymnosperms are foundakeady in the group of Cordaitse ^which also play a very prominentrole in the Carboniferous system. (2) The further development ofthe flora. In the Devonian formation the.
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