48 
LIQUOR  OPII  COMPOSITUS. 
moments.  Empty  and  drain  the  funnel  and  filter  and  place 
them  on  a  proper  funnel  stand.  Arrange  a  16  f^  or  480  cc. 
tared  capsule  or  evaporating  dish  upon  a  water  bath  over  a  gas 
flame  or  other  sufficient  source  of  heat,  and  heat  the  water  in 
the  bath  to  boiling.  Place  the  funnel  stand  so  that  the  point  of 
the  funnel  is  over  the  capsule  on  the  bath,  and  then  having 
stirred  up  the  opium  mixture  well,  fill  the  filter  from  it,  very 
nearly  up  to  its  edge,  and  continue  to  refill  it  occasionally  until 
the  whole  of  the  mixture  has  been  poured  in.  When  the  residue 
in  the  filter  is  drained,  measure  off  6  f^.  or  180  cc.  of  water, 
and  rinse  the  vessel  which  contained  the  opium  mixture  two  or 
three  times  with  small  portions  of  this  water,  dissolving  off,  or 
loosening  whatever  may  have  become  adherent  to  the  vessel  by 
drying,  by  means  of  the  stirrer,  and  pour  the  rinsings  one  after 
another  into  the  top  of  the  residue  in  the  filter.  Then  keep  the 
filter  filled  up  with  the  remainder  of  the  water  until  it  has  all 
been  poured  on,  and  again  drain  the  residue.  Then  return  the 
residue  from  the  filter  to  the  vessel  in  which  the  mixture  was 
made,  by  the  use  of  the  spade-ended  stirrer,  leaving  the  filter 
as  clean  as  possible,  and  unbroken  in  its  position.  To  the  resi- 
due add  1*67  f^.  or  50  cc.  of  water,  stir  it  well  into  a  smooth 
magma,  and  pour  it  back  into  the  filter,  draining  and  scraping 
as  much  of  it  out  the  vessel  as  practicable.  Level  it  down  in 
the  filter,  or  rather  so  spread  it  out  against  the  side  of  the  filter 
as  to  leave  the  surface  concave.  Then  measure  off  5  f^.  or 
150  cc.  of  water,  and  rinse  the  mixing  vessel  with  small  portions 
of  this  at  a  time  until  the  vessel  is  clean,  pouring  the  successive 
rinsings  into  the  concave  surface  of  the  residue  in  the  filter,  and 
keep  the  filter  filled  up  with  the  remainder  of  the  water  until  it 
is  all  poured  on.  When  the  residue  is  drained,  the  filters  and 
residue  may  be  removed  from  the  funnel,  be  flattened  a  little 
upon  a  folded  newspaper,  be  put  to  dry,  and  when  as  thoroughly 
dried  as  the  powdered  opium  was,  may  be  weighed  if  desirable. 
In  weighing,  the  outside  filter  is  to  be  removed  and  placed  in 
the  weight  scale  to  counterbalance  the  other  one,  or,  if  a  nice 
weighing  of  the  residue  be  desired,  the  inside  filter  must  be 
weighed  and  the  weight  marked  on  it  with  lead  pencil  before  it 
is  used.    The  dry  residue  from  good  powdered  opium  weighs 
