An\ukust'  SS™1"}    Coriaria  myrti 'folia  as  an  Adulterant.  561 
lanceolate,  and  shorter  petiolate,  pellucid  punctate,  midrib  prom- 
inent, the  lateral  veins  curved  unevenly,  both  surfaces  covered  with 
whitish  pubescence ;  bracts  ovate  to  oblong,  pubescent. 
Under  the  microscope,  the  epidermal  cells  on  both  surfaces  are 
shown  to  be  strongly  sinuate  in  outline  with  thickened  warty  walls, 
stomata  small  and  more  numerous  on  the  lower  surface ;  trichomes 
on  both  surfaces  abundant  and  of  three  distinct  types:  (1)  thin- 
walled,  jointed  hairs  more  or  less  appressed  and  bent,  (2)  stalked 
hairs  with  glandular  one-cell  head,  (3)  the  cup  shaped  gland  with 
multiple-cell  head.    Cross  section  shows  that  the  leaf  is  bifacial 
Fig.  6.    Cross  Section,  Sweet  Marjoram  Leaf. 
with  prominent  palisade  tissue  and  comparatively  narrow  loose 
mesophyl  and  no  crystal  cells.  The  structural  characteristics  of 
sweet  marjoram  leaf  are  quite  distinctive. 
Coriaria  leaves  could  not  be  obtained  in  the  drug  trade  and, 
under  existing  war  conditions,  it  was  not  possible  to  obtain  samples 
from  correspondents  abroad.  A  small  sample  of  "  finely  cut  leaves 
of  Coriaria  myrtifolia"  supplied  by  the  U.  S.  Department  of  Agri- 
culture was  procured  from  Prof.  Chas.  H.  LaWall  for  comparison. 
The  Department  had  advised  him  "  that  they  did  not  have  specimens 
of  the  entire  leaves  nor  any  information  as  to  where  they  could  be 
obtained."  This  sample  consisted  of  small  leaf  fragments  that  were 
very  similar  to  those  that  had  been  separated  from  the  marjoram 
under  examination  and  created  the  suspicion  that  they  likewise  had 
been  obtained  by  isolation  from  an  adulterated  importation.  In  the 
absence  of  more  definite  information  as  to  their  source  this  sample 
was  not  accepted  as  authentic. 
Reliable  authentic  leaves  of  the  Coriaria  myrtifolia  were,  how- 
ever, obtained  from  the  herbarium  of  the  Academy  of  Natural 
