Am.  Jour.  Pharm.  \ 
May,  1882.  J 
A  New  Displacement  Apparatus. 
237 
of  the  displacement  apparatus,  by  means  of  clamps  with  India  rubber 
rings  between  to  render  it  air  tight.  The  drug  to  be  operated  on  hav- 
ing been  previously  sufficiently  moistened  with  the  menstruum  and 
packed  is  next  exhausted  of  as  much  air  as  possible  by  a  vacuum  being 
produced  through  the  upper  part  of  the  vessel,  by  means  of  an  air 
Percolator,  with  air  pump. 
pump       which  is  coiniccted  witli  it  by  means  of  the  tube  F.  Tlie 
stop-cock  h  is  next  closed  and      opened,  connecting  with  the  tube 
the  end  of  which  dips  into  the  licpiid  to  be  em})loyed  as  menstruum, 
and  thereby  a  sufficient  quantity  of  it  is  [dlowed  to  be  drawn  into  the 
