4i6 
North  American  Conifer ce. 
( Am.  Jour.  Pharm. 
\      August,  1896. 
A  very  few  stone  cells  were  observed  in  the  bark. 
The  leaves  are  sessile,  four-sided  and  four-angled,  glaucous, 
very  sharp-pointed,  inch  to  I  inch  long,  and  ^  inch  thick. 
On  each  face  were  observed  four  more  or  less  interrupted  rows  of 
stomata.  The  epidermis  was  composed  of  one  layer  of  small,  thick- 
walled  cells,  the  hypoderma  also  of  a  single  layer  of  thick-walled 
cells,  and  the  mesophyll  of  wavy-walled  cells.    The  secretion  reser- 
Fig.  43- — Cross-section  of  leaf  of  Picea  pungens,  magnified  75  diameters. 
Ep,  epidermis;  hy,  hypoderma;  sec.  r.,  secretion  reservoir;  st,  stoma;  m,  meso- 
phyll ;  en,  endodermis  ;  xy,  xylem  ;  t,  transfusion  tissue  ;  ph,  phloem. 
voirs  at  the  lateral  angles  were  of  rather  large  size.  The  central 
fibro-vascular  bundle  was  double,  of  small  size,  enveloped  by  a 
rather  copious  transfusion  tissue,  and  this,  in  turn,  was  surrounded 
by  distinct,  rather  large-celled  endodermis. 
CHEMICAL  COMPOSITION. 
From  a  good-sized  nursery  specimen  grown  in  Pennsylvania,  we 
have  been  able  to  make  some  examination  of  the  constituents  in 
