Am.  Jour.  Pharm. 
June,  1896. 
North  American  Coniferce. 
327 
sublying  parenchyma,  the  periderm  appearing  mostly  at  the  sur- 
face. The  outer  layers  of  the  periderm  were  thick-walled,  the  inner 
thin-walled  and  quite  rich  in  tannic  matters.  The  large-celled  par- 
enchyma next  interior  contained  lacunae  and  secretion  reservoirs, 
and  many  of  its  cells  were  heavily  charged  with  tannin.  A  few  cells 
of  this  region  were  observed  to  contain  crystals  of  calcium  oxalate 
similar  to  those  observed  in  Pinus  Strobus.  The  bast  layer  was 
destitute  of  fibrous  or  other  lignified  elements,  and  had  its  tannin 
cells  mostly  arranged  in  radial  rows.  Most  of  the  cells  of  this 
layer  were  small,  but  there  were  occasional  larger  ones  containing 
tannin  or  oleoresin. 
The  xylem  presented  no  important  peculiarities,  save  that  the 
walls  of  the  tracheids  showed  less  thickening  than  in  most  species  of 
the  genus. 
CHEMICAL  COMPOSITION. 
We  have  been  able  to  obtain  a  small  quantity  of  the  stem  bark 
of  this  pine  through  the  kindness  of  Dr.  Charles  Mohr.  It  was 
collected  in  February  in  the  vicinity  of  Appalachicola;  Fla. 
In  addition  to  the  resin,  the  bark  yielded  the  following  data  in 
regard  to  tannin  and  ash  : 
Per  Cent. 
Moisture  7*44 
Ash  in  absolutely  dry  substance  170 
Tannin  in  absolutely  dry  substance  3 '56 
PINUS  MONTANA,  DU  ROI. 
GENERAL  CHARACTERS. 
This  is  the  Dwarf,  or  Mugho  pine  of  Southern  Europe.  It  is 
frequently  planted  for  ornament  in  American  parks  and  gardens.  It 
is  a  shrub,  or  small  bushy  tree,  seldom  attaining  a  height  of  more 
than  8  or  10  feet. 
It  bears  rather  small  tapering  cones,  whose  scales  are  tipped 
with  slight  prickles.  Its  leaves  are  2  or  3  inches  long,  stiff,  in 
twos,  from  a  sheath  about  inch  long,  flat  on  one  side  and  convex 
on  the  other ;  stomata  in  about  6  or  8  rows  on  the  flat  surface,  and 
in  from  9  to  12  on  the  convex.  The  epidermis  is  large-celled,  with 
the  cell  walls  excessively  thickened  ;  the  hypoderma  is  one-layered, 
and  the  walls  of  its  cells  are  but  slightly  thickened  ;  the  secretion 
reservoirs  are  five  or  six  in  number,  in  contact  with  the  hypoderma, 
and  its  circle  of  strengthening  cells  are  thick- walled.  The  endo- 
dermal  cells  have  their  walls  somewhat  thickened.    The  vascular 
