Am.  Jour.  Pharm. 
June,  1896. 
North  American  Conifer ce. 
331 
to  those  occurring  in  species  already  described.  The  bast*layer[was 
destitute  of  lignified  elements,  and  contained  numerous  tannin  cells 
commonly  arranged  in  more  or  less  distinct  radial  rows. 
Fig.  cross-section  of  leaf  of  Pinus  Virginiana,  magnified  80  diameters,. 
a,  stoma  ;  6,  first  layer  of  hypoderma,  composed  of  rather  thin-walled  cells  ;  cy 
second  layer  of  hypoderma,  composed  of  thick-walled  cells;  d,  mesophyll  cell; 
e,  cell  of  endodermis  ;  f,  secretion  reservoir  ;  g,  xylem  of  one  of  the  bundles  ; 
h,  transfusion  tissue  ;  R,  phloem  of  one  of  the  bundles. 
