5^4 
Coriaria  myrtifolia  as  an  Adulterant. 
/Am.  Jour.  Pharm. 
*    August,  iqi8. 
palisade  layer  beneath  the  upper  epidermal  cells  of  one  to  three 
rows  deep  and  beneath  this  a  spongy  mesophyll.  The  upper  cells  of 
the  mesophyll  and  the  lower  cells  of  the  palisade  layer  contain  nu- 
merous oxalate  crystals.  It  will  be  thus  seen  that  coriaria  possesses 
a  distinct  structure  and  that  the  large  polygonal  cells,  the  stomata 
and  striped  neighbor  cells  are  important  as  distinguishing  histo- 
logical characters. 
Fig.  11.    Longitudinal  Section  of  Midrib  of  Coriaria  Leaf;  sieve  tubes  and 
trachea  of  the  vascular  bundle. 
The  leaf  fragments  separated  from  the  marjoram  showed  the 
glabrous  surface,  the  polygonal  cells  and  the  characteristic  stomata 
and  stripped  cells.  They  were  however  somewhat  thicker  than  the 
leaves  of  coriaria  at  first  examined  and  showed  in  many  cross  sec- 
tions never  less  than  two  and  usually  three  layers  of  palisade  cells. 
The  majority  of  the  authentic  leaves  of  coriaria  examined  were 
thinner  and  of  a  softer  texture  and  less  wrinkled  surface  than  these 
fragments  and  on  cross  section  showed  only  one  or  at  most  two  rows 
of  palisade  cells. 
