MICROSCOPICAL EXAMINATION 



SIS 



FIG. 296. Powdered Yellow Cinchona. (X 60.) A, Bast fibers. B, Bast fibers with adjacent 

 parenchyma cells. C.Cork, surface view. D, Starch. E, Parenchyma containing Jstarch. P, 

 Fragments of the phloem. G. Parenchyma containing fine crystals of calcium oxalate. 



FIG. 297. Powdered Rhubarb. (XiSa.) A, Fragments of reticulate water-, tubes. U, 

 Spiral water tube. C, Aggregate crystals of calcium oxalate. D, Starch. E, Parenchyma. F, 



