RHIZOMES AND ROOTS. 



267 



PLATE C XVIII. 



FIG. 128. Powdered Turpeth Root (x 240). 



a, Starch. 



cr, Rosette crystals. 



cs, Resin cells. 



fl, Wooid fibres. 



pc, p'c'. Cortical parenchyma in longitudinal and transverse 



section. 



PI, Parenchyma of wood. 

 res, Masses of resin. 

 rm, P'm', r"m", Medullary rays in longitudinal, tangential, 



and transverse section. 

 s, 8', Cork in surface view and section. 

 sc, Sclerenchymatous cells. 

 v, v', Vessels in longitudinal and transverse section. 



