Fig.  5,  Rhamnus  Californica,  powder.  B,  collenchyma  ;  c,  sclerenchyma 
(cross);  ^sclerenchyma  (longitudinal);  d,  stone  cells;  e,  medullary  ray  ;  f, 
bast  bundle  ;  g,  parenchyma  ;  h,  crystals  of  calcium  oxalate. 
Fig.  6,  Rhamnus  Frangula,  powder.  B,  collenchyma ;  c,  sclerenchyma 
(cross);  cf  sclerenchyma  (longitudinal);  e,  medullary  ray  ;  ft  bast  bundle  ;  g, 
parenchyma  ;  h,  crystals  of  calcium  oxalate. 
