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UMB.ILICAL VESSELS. Sect. III. II. 9. 



but in the ligneous fubftance itfelf ; or, to fpeak more accurately, that 

 thofe veffels are themfelves the woody fibres included between the 

 pith and the bark of plants, which have their origin in the roots, and 

 extend themfelves to every part of the plant." Bonnet ufage des 



feuilles, p. 275. 



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