23 o  Fluid  Extracts  by  Reper eolation.  {Am'J™\^rm' 
stronger  alcohol.  The  s.  g.  of  this  mixture  is  '926  at  I5,6°C.= 
6o°F.  or  '919  at  25°C.=77°F.  or  '9236  at  the  room  temperature  at 
which  the  weighings  were  made. 
The  same  formula  and  process  were  used  as  in  the  first  repercola- 
tions  of  Cimicifuga,  with  the  exception  of  the  menstruum,  and  the 
powder  was  from  the  same  stock,  and  used  on  the  same  scale  of  a  troy- 
ounce=3n  grams,  for  each  part,  and  therefore  8  troyounces— 
248*8  grams,  of  powder  for  each  percolation  ;  and  in  this  case  the 
whole  four  percolations  were  made.  The  following  table  gives  the 
results  of  this  repercolation,  and  contains  the  same  elements  obtained  in 
the  same  way,  but  the  first  percolation  attained  a  much  more  thorough- 
exhaustion,  while  the  subsequent  ones  were  not  carried  so  far  on 
account  of  the  apparent  inertness  of  the  extractive  matter  obtained* 
The  third  percolation  was  much  less  successful  than  the  others  in- 
consequence of  too  short  a  maceration.  This  carried  too  much  of  the 
extract  forward  by  the  weak  percolates  into  the  fourth  percolation,  and 
overloaded  it.  But  this  serves  as  an  excellent  example  of  the  way  in 
which  the  errors  of  one  percolation  are  corrected  by  those  which 
follow  when  repercolation  is  used. 
