58 
LIQUOR  OPII  COMPOSITUS. 
four  grains  of  morphia  in  each  fluidounce.  Then  45*75  fluid- 
ounces  multiplied  bj  447*5  grains,  the  weight  assumed  for  each 
fluidounce  of  the  finished  preparation,  gives  20473*125  grains, 
which  is  the  weight  to  which  the  solution  must  be  made  up  in 
finishing  it.  Then  47*75  x  164*91  7544*63,  which  is  the 
whole  number  of  grains  of  alcohol  to  be  contained  in  the  finished 
preparation.  But  the  constant  quantity  1574  grains  of  alcohol 
has  already  been  added  before  the  assay,  and  therefore  this  must 
be  subtracted  from  the  whole  quantity.  Then  7544*63—1574 
=5970*63,  which  is  the  number  of  grains  of  alcohol  still  required 
to  finish  the  preparation  in  this  supposed  case. 
This  latter  quantity  is  weighed  into  a  tared  bottle  which  will 
hold  the  entire  finished  preparation. 
Then  45*75  x23*13=-1058*20,  which  is  the  number  of  grains 
of  purified  chloroform  required.  This  is  weighed  in  any  conve- 
nient vessel,  and  poured  into  the  bottle  containing  the  alcohol. 
Then  45*75x27*29=1248*52,  which  is  the  number  of  grains  of 
acetic  ether  required.  This  is  weighed  in  the  vessel  used  for  tke 
chloroform,  and  is  also  poured  into  the  bottle  with  the  alcohol. 
The  bottle  is  then  shaken  to  mix  the  contents,  the  assayed  opium 
solution  added,  and  the  bottle  again  shaken.  This  remainder  of 
the  assayed  opium  solution  weighed  7407  grains,  and  consisted 
of  5926*6  grains  of  watery  solution  and  1481*4  grains  of  alcohol. 
It  originally  weighed  7870  grains,  and  consisted  of  6296  grains 
of  watery  solution  and  1574  grains  of  alcohol,  but  463  grains  of 
the  mixture  (370'4  grains  watery  and  92*6  grains  alcohol)  was 
taken  for  assay.    The  bottle  now  contains  of 
Assayed  opium  solution,       7407*00  grains. 
Remainder  of  the  alcohol,      5970*63  " 
The  chloroform,  1058*20  " 
The  acetic  ether,  1248*52  " 
Making,  15,684*35  " 
But  it  is  required  to  weigh  20,473*125  grains,  and  this  weight 
is  to  be  made  up  with  water.  Therefore,  20,473  grains  less 
15,684  grains  gives  4789  grains  as  the  quantity  of  water  re- 
quired to  complete  the  weight  and  finish  the  process. 
Leaving  the  completed  illustration  now,  and  resuniing  the 
