'^'"■ju'iy^mi**^™"}        Pharmacognosy  of  Echinacea.  323 
namely,  the  Ligiiliflorse,  the  oils  and  resins  are  replaced  by  laticifer- 
ous  tubes  or  vessels.  In  only  one  genus  (Gimdelia)  of  the  Tubuli- 
florse  are  laticiferous  tubes  present,  and  while  the  root  of  this  plant 
apparently  contains  resin  canals,  these  are  wanting  in  the  leaves  and 
stems.  Again,  in  only  one  genus  {Scolyinus)  of  the  Liguliflorse  are 
oil  canals  present,  as  well  as  latex  tubes  (see  DeBary,  p.  137;  and 
Engler  and  Prantl,  p.  351). 
The  oleoresinous  canals  or  reservoirs  (Figs,  i,  4  and  5)  found 
in  Brauneria  pallida^  are  of  the  general  type  occurring  in  the  Tubuli- 
florae.  They  are  quite  numerous  and  in  some  instances  quite  large, 
and  are  found  in  both  the  wood  and  the  bark.  The  contents  are  of 
a  light  yellowish,  amber-like  color  and  of  an  oily  or  resinous 
consistence.  There  appears  to  be  no  relationship  between  the  sub- 
stance found  in  these  oleo-resinous  canals  and  the  black  substance 
present  in  most  of  the  intercellular  areas  around  the  stone-cells. 
This  latter  substance  is  of  a  nearly  uniform  black  color,  insoluble 
in  both  sulphuric  and  nitric  acids,  and  the  ordinary  solvents,  such  as 
alcohol,  acetone  and  petroleum  ether,  etc.  In  longitudinal  section, 
or  upon  treating  the  drug  with  Schultze's  Macerating  Fluid,  it  is 
found  that  this  substance  forms  a  somewhat  coarse  network,  the 
material  from  a  number  of  intercellular  areas  being  more  or  less  con- 
nected and  the  network  resembling  a  septate  latex  tissue.  Beyond 
this  appearance  there  is  no  resemblance  between  the  network  of  black 
intercellular  substance  and  true  laticiferous  tissue.  In  some  of  the 
parenchyma  cells  of  both  the  bark  and  the  wood  there  may  occur 
a  black  substance  resembling  this  intercellular  substance,  which 
would  seem  to  be  in  the  nature  of  an  excretion  from  some  of  these 
cells. 
It  should  be  stated,  however,  that  in  some  of  the  longitudinal 
sections  there  was  observed  in  the  cortical  tissue  a  number  of  elon- 
gated areas  containing  an  emulsion  of  a  yellowish  oily  or  resinous 
substance.  It  could  not  be  determined  with  certainty  whether  these 
were  in  the  nature  of  elongated  secretory  cells  or  merely  inter- 
cellular spaces  into  which  had  been  secreted  the  oleo-resinous  mate- 
rial. There  are  a  number  of  facts  which  would  seem  to  lead  to  the 
inference  that  they  are  probably  in  the  nature  of  elongated  secretory 
cells. 
Some  time  ago  Moscr  published  an  article  on  Echinacea  and  a 
Spurious  Root,  that  appeared  in  the  fall  of  1909  (AJ.Ph.,  iQio, 
p.  224).    As  he  did  not  have  an  opportunity  of  studying  authentic 
