32 
North  American  Conifer  ce. 
/Am.  Jour.  Pharm. 
X     January,  1896. 
results  obtained  must,  therefore,  represent,  with  a  fair  degree  of 
acccuracy  the  distribution  of  tannin  in  the  living  tissues. 
Both  the  bast  and  cortical  regions  of  the  stem  abound  in  cells 
containing  mucilage.    These  cells  are  usually  larger  in  transverse 
Fig>  3>  cross-section  of  leaf  of  Pinus  Strobus  magnified  150  diameters;  a, 
epidermis,  composed  of  very  thick-walled,  lignified  and  cutinized  cells;  6,  hypo- 
derma,  composed  of  lignified  and  thick-walled  fibres;  c,  mesophyll  cell,  show" 
ing  folds  in  the  cell  wall;  d,  endodermis,  enclosing  a  single  collateral  bundle; 
e,  xylem  of  the  bundle;  /,/' ',  secretion  reservoirs;  gy  pericycle,  consisting  of 
numerous  thin-walled  and  short  tracheids  containing  pits  in  their  walls  similar 
to  those  in  the  walls  of  the  tracheids  of  the  stem  and  root  (the  so-called 
"transfusion  tissue  "). 
view  than  the  cells  with  which  they  are  associated.  Most  of  them 
also  contain  tannin,  and  many  of  them  oleoresinous  matter 
besides. 
