BARKS. 



207 



PLATE XCF. 



f , r 



FIG. 101. Powdered Sassafras Root Bark ( x 240). 



a, Starch grains. 



cpi Pitted cells from the bast ring 



fl, Bast fibres. 



go, Oil-cells. 



I, I', I", Bast in radial, transverse, and tangential section. 



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

 section. 



ph, Phelloderm. 



rm, r'm', r"m", Medullary rays in radial, transverse, and tan- 

 gential section. 



s,s', Cork in surface view and profile. 



vg, v'g', Sieve tubes more or less collapsed, in longitudinal and 

 transverse section. 



