MEDULLARY RAYS. 225 
Junipert (Fig. 141), L. Guaiaci, L. Quassie surinamense,* 
sometimes two or three rows, as in Lign. Quassie jamaicense 
(Fig. 137), and sometimes still more, as in rhubard (Fig. 142). 
It follows from this that, on a transverse section, the fibro- 
vascular bundles must appear either in radial rows, or separated 
wv ae 
Fic. 142,—Tangential longitudinal section of Rhubarb. A, Fundamental scene a 
the bark with five medullary rays, which are cut transversely. B, Section from the 
xylem portion, which is traversed,by netted vessels (v) of considerable size; 0, rosettes 
of oxalate crystals. : 
from each other by large medullary rays. The tissue of “i 
medullary rays, at least within the compass of the fibro-vascular 
1 Berg’s ‘“ Atlas,” plates xxv. to xxviii. 
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