Am.  Tour,  Pharm.  "> 
February,  1896.  J 
North  American  Conifer  ce. 
The  structure,  in  other  respects,  was  found  to  be  similar  to  that  of 
the  leaf  of  P.  rigida. 
The  cross-section  of  a  twig  of  this  species  showed  a  structure  not 
unlike  that  of  P.  rigida,  except  that  the  secretion  reservoirs  appeared 
to  be  rather  more  abundant,  both  in  the  bark  and  in  the  wood. 
The  distribution  of  oleoresinous  matter  was  otherwise  similar, 
and  the  distribution  of  tannin  was  also  similar.    (See  Fig.  12.) 
An  examination  of  the  roots  of  these  two  species  did  not  reveal 
any  decided  differences  between  their  structure  and  that  of  the 
Fig.  11,  cross-section  ofleaf  of  Pinus  Austriaca,  magnified  65  diameters  ;  ep, 
epidermis  ;  st,  stoma  ;  f,  p,  folded  parenchyma  composing  the  mesophyll ; 
sec,  r,  secretion  reservoir  ;  hy,  hypodermal  fibres  ;  en,  endodermis  ;  ph,  phloem; 
xy,  xylem  ;  trf,  t,  transfusion  tissue  ;  sec,  res,  small  secretion  reservoir  in  the 
stele. 
stems  of  the  same  species,  except,  of  course,  such  differences  as 
generally  exist  between  root  and  stem  structures.  The  wood  of 
the  roots,  however,  was  larger-celled,  and  the  cells  thinner-walled, 
•  making  the  structure  more  spongy.  The  bark  of  both  roots  seemed 
to  possess  somewhat  less  tannin  than  that  of  the  stems,  and  the  paren- 
chyma cells,  both  of  the  bark  and  medullary  rays,  were  rich  in 
starch,  while  the  corresponding  cells  of  the  stem  contained  very 
