Am.  Jour.  Pharm.  \ 
December,  1920.  ) 
The  Theory  of  Percolation. 
869 
his  description  of  the  well-tube  percolator,  he  says^  one  of  the  ad- 
vantages of  the  apparatus  is  that  it  combines  maceration  with 
percolation. 
In  this  connection  some  figures  obtained  by  the  writer  in  the 
Chart  F. 
extraction  of  i6  2/3  pounds  of  Phytolacca  are  of  interest.  The 
drug  was  moistened,  packed  in  the  usual  way  and  macerated  with 
diluted  alcohol  for  two  days.  Three  pints  of  percolate  were  then 
taken,  the  flow  being  adjusted  to  drops.  The  percolator  was  shut 
1  Froc.  A.  Ph.  A.  1872,  183. 
