Am.  Jour,  Pharm.  1 
Feb.,  1885.  J 
Pine  or  Forest  Wool. 
103 
ing  cells ;  and  D,  the  parenchymatous  tissue  surrounding  the  vascular 
bundles. 
Fig.  2  shows  the  tissues  of  which  these  fibrous  substances  are  com- 
posed. A,  the  epidermal  tissue,  a  series  of  elongated  cells  alternating 
with  a  series  of  tabular  cells,  the  latter  containing  the  stomata ;  the 
side  walls  have  an  undulating  outline,  so  that  the  adjoining  cells  fit 
into  each  other.  The  parenchymatous  tissue  within  the  epidermal 
layer  and  that  surrounding  the  vascular  bundles,  fundamental  tissue, 
being  thin  and  delicate,  is  for  the  most  part  disintegrated  and  destroyed 
in  the  process  for  the  preparation  of  the  wool,  leaving  the  more  tenaci- 
ous epidermal  cell  tissue  (^A\  with  the  fibro-vascular  bundles,  repre- 
sented by  B  the  bast  cell,  and  C  and  D  annular  and  spiral  vessels,  as 
the  component  parts  of  this  fibrous  material. 
Fig.  1.  Fig.  2. 
The  several  tissues  of  each  sample  were  found  to  correspond  with 
those  in  the  leaf  of  the  pine ;  there  was  no  tissue  found  that  had  not 
its  counterpart  m  the  pine  leaf,  and  the  pine  leaf  being  equally  exa- 
mined had  no  tissue  that  was  not  present  in  the  samples  of  this  fibrous 
material. 
It  is  therefore  evident  that  this  fibrous  substance,  to  which  the  term 
pine  or  forest  wool  was  originally  applied,  and  to  which  it  now  applies 
