FORMULA  FOR  THE  FLUID  EXTRACTS. 
535 
alcohol  until  three  pints  of  tincture  have  passed,  reserving  the 
first  twelve  fluid  ounces.  Evaporate  the  remainder  of  the  tinc- 
ture at  150°  Fahr.  to  four  fluid  ounces,  mix  it  with  the  reserved 
tincture,  and  after  standing  twenty-four  hours,  filter  through 
paper. 
In  the  same  manner  prepare 
EXTRA.CTUM  COLOMBO  FLUIDUM. 
From  Columbo,  in  powder,  No.  40. 
EXTRACTUM  CHlRAYTiE  FLUIDUM. 
From  Chiretta,  in  powder,  No.  50. 
EXTRACTUM  EUPATORII  FLUIDUM. 
From  Boneset,  in  powder,  No.  50. 
EXTRACTUM  GENTIANS  FLUIDUM. 
From  Gentian,  in  powder,  No.  50. 
EXTRACTUM  SCILL^  FLUIDUM. 
From  Squill,  in  powder,  No.  30. 
EXTRACTUM  SENEGA  FLUIDUM. 
From  Seneka,  in  powder,  No.  50. 
EXTRACTUM  SERPENTARLE  FLUIDUM. 
From  Virginia  Snakeroot,  in  powder,  No.  60. 
Remarks — In  making  Fluid  Extract  of  Colchicum,  by  this 
formula,  a  whitish  colored  sediment  is  deposited  from  the  reserv- 
ed tincture  by  standing,  and  also  by  the  evaporation  of  the  last 
liquors,  and  after  the  mixture  of  the  two  the  quantity  seemed  to 
slightly  increase.  The  nature  of  this  matter  has  not  been 
determined,  but  it  is  believed  to  be  identical  with  that  deposited 
from  the  wine,  and  in  no  wise  connected  with  the  activity  of  the 
preparation.  It  is  well,  therefore,  in  this  instance,  to  postpone 
the  filtration  of  the  fluid  extract  when  not  wanted  for  immediate 
use.  It  is  highly  probable  that  this  substance  may  be  avoided 
by  employing  concentrated  alcohol  to  extract  the  root,  and 
subsequently  distilling  off  sufficient  of  it  to  reduce  the  alcoholic 
strength  of  the  fluid  extract  to  that  above  exhibited,  which  is 
about  25  per  cent. 
In  regard  to  the  permanency  of  Fluid  Extract  of  Seneka,  there 
is  some  doubt,  theoretically,  owing  to  the  tendency  of  an  alco- 
