BARKS. 



191 



PLATE LXXXIII. 



'0 a . fll 



W 

 fo< 



101/lfe . 



FIG. 93. Powdered Cassia Bark (x 240). 



a, Starch. 



cr, Crystals of calcium oxalate. 



fl, Bast fibres, entire or broken. 



go, Secretion cells. 



1,1', Bast, in longitudinal and transverse section. 



pc, Cortical parenchyma. 



ph, Phellogen. 



rm, p'm', Medullary rays in longitudinal and transverse 



section. 



s, s', Outer layers of cork, in surface view, and in profile. 

 sc, Sclerenchymatous cells. 

 se, s'e', Inner, thickened layers of cork, in surface view 



and in profile. 



