536 
FORMULA  FOR  THE  FLUID  EXTRACTS. 
holic  solution  of  Seneka  to  deposit  polygalic  acid  in  cool  wea- 
ther. It  remains  to  be  observed  whether  this  will  prove  an 
objection  to  the  formula.  Made  with  sugar,  it  has  been  known 
to  gelatinize  and  lose  its  fluidity,  possibly  owing  to  the  action  of 
the  pectin,  or  pectic  acid  which  is  known  to  be  an  ingredient  of 
the  root. 
From  the  gummy  nature  of  Squill,  it  is  necessary  to  use  a 
coarser  powder  than  would  be  proper  for  most  other  substances. 
Columbo  in  its  behaviour  with  diluted  alcohol  is  analogous  to 
Rhubarb.  If  very  fine,  the  percolation  is  too  tardy — hence  a 
coarser  powder  is  directed. 
Fluid  Extract  of  Serpentaria,  fully  represents  that  drug  when 
made  by  this  formula.  It  is  possible  the  weak  alcoholic  men- 
struum may  not  be  so  highly  approved  as  a  saccharine  one,  but 
it  may  be  sweetened  before  using. 
Class  Fourth — Saccharine  Fluid  Extracts, 
EXTRACTUM  CINCHONA  FLUIDUM. 
Take  of  Yellow  Peruvian  bark,  in  powder, 
(No.  50,)  16  ounces  Troy. 
Sugar,  10  ounces. 
Diluted  alcohol,  a  sufficient  quantity. 
Moisten  the  Peruvian  Bark  with  half  a  pint  of  diluted  alcohol, 
let  it  stand  half  an  hour,  pack  it  in  a  percolator  firmly,  cover  it 
with  a  disc  of  cloth,  and  gradually  add  diluted  alcohol  till  three 
pints  of  tincture  have  passed.  Evaporate  the  tincture  at  a 
moderate  heat  on  a  water  bath  to  one  pint,  add  the  sugar,  and 
continue  the  evaporation  till  reduced  to  one  pint,  and  strain 
while  hot. 
In  the  same  manner  prepare 
EXTRACTUM  CHIMAPHIL^E  FLUIDUM. 
From  Pipsissewa,  in  powder,  No.  50. 
EXTRACTUM  DULCAMARA  FLUIDUM. 
From  Bittersweet,  in  powder,  No.  50. 
EXTRACTUM  QcXLLM  FLUIDUM. 
From  Galls,  in  powder,  No.  40. 
EXTRACTUM  GERANII  FLUIDUM. 
From  Cranesbill,  in  powder,  No.  50. 
