Am.  Joar.  Pharm. 
September,  1895. 
Structure  of  Our  Cherry  Barks. 
441 
sometimes  stellately  clustered,  but  more  commonly  are  single  and 
are  most  abundant  in  the  cells  adjacent  to  the  medullary  rays. 
The  medullary  rays  contain  usually  an  abundance  of  very  fine- 
grained starch.  The  granules  of  starch  are  usually  spheroidal  and 
simple,  with  an  inconspicuous  central  or  sub-central  hilum,  and  no 
Fig.  6. — Longitudinal  section  of  inner  bark  of  Prunus  Mahaleb. 
other  recognizable  markings.  Some  double  and  treble  grains,  how- 
ever, are  observable. 
The  root  bark  of  this  species  bears  a  close  resemblance  to  that  of 
the  stem,  but  it  is  lighter  exteriorly  and  the  corky  layer  earlier 
begins  to  fissure.     The  clusters  of  sclerenchyma  cells  are  less 
