A.m.  Jour.  Pharm. 
June,  1896. 
North  American  Conifer  ce. 
335 
reservoirs  were  numerous,  usually  about  ten,  in  contact  with  the 
hypoderma,  and  each  had  a  circle  of  very  thick-walled  supporting 
cells.  The  endodermis  was  rather  large-celled  and  the  radial  walls 
were  thickened  and  cutinized.  The  two  diverging  vascular  bundles 
were  each  about  three-rayed.  At  the  outer  margin  of  the  phloem 
were  numerous  thick- walled  fibres ;  they  also  occurred  between 
Fig.  J7,  portion  of  cross-section  of  stem,  two  years  old,  of  Pinus  sylvestris, 
magnified  100  diameters.  Ep,  epidermis  ;  p,  periderm  layer  ;  t,  tannin  cell  in 
cortex  ;  /,  intercellular  air  space,  or  lacuna;  sec.  r.,  secretion  reservoir  ;  b,  bast 
layer  of  bark  ;  c,  cambium  zone.  Drawing  made  from  a  specimen  that  had 
been  treated  with  a  solution  of  ferric  chloride  in  absolute  alcohol,  to  show 
distribution  of  tannin. 
the  bundles  and  scattered  in  the  transfusion  tissue  between  the 
xylem  of  the  bundles  and  the  endodermis. 
A  cross  section  of  the  stem  two  years  old  showed  the  following 
structure :  Fragmentary  remains  of  the  small-ceiled  or  thick-walled 
epidermis  at  the  exterior ;  beneath  it  two  or  three  layers  of  thin- 
walled  cells  ;  beneath  this  the  periderm  layer,  the  outer  cells  of 
