370  Rapid  Estimation  of  Quinia.  {^']^;^]m' 
The  deposit  of  morphia  takes  place  rapidly  under  the  form  of  a  crys- 
talline powder.  The  whole  is  allowed  to  stand  for  a  quarter  of  an 
hour  and  then  27  grams  of  950  alcohol  are  added.  After  shaking 
several  times  it  is  again  allowed  to  stand  for  half  an  hour  and  then 
thrown  upon  a  tared  filter.  The  alkaloid  is  washed  upon  the  filter  with 
alcohol  of  500.  After  washing,  it  only  requires  to  be  dried  and 
weighed.  The  mother  liquors  left  to  themselves  deposit  after  forty- 
eight  hours  only  a  small  precipitate  that  need  not  be  noticed. 
With  the  same  opium  the  following  results  have  been  obtained.  Ten 
grams  of  opium  yielded  by  the — 
New  Process.  Guillermond's  Process. 
1*09  of  crystalline  product.  1*16    f  or^  crystalline  product  con- 
i*o8  "  "  <  taining  much  more  nar- 
I*i6  "  "  v      (  cotin. 
i-ii  " 
1-06 
1-07 
106  " 
In  exact  determinations  advantage  has  been  taken  of  the  property  of 
narcotin  of  not  saturating  acid  liquors  even  in  the  presence  of  morphia, 
the  quantity  of  acid  required  for  the  saturation  of  25  centigrams  of  the 
precipitate  obtained  being  ascertained. 
For  this  purpose  25  centigrams  of  the  precipitate  are  dissolved  in 
10  cc.  of  a  solution  of  sulphuric  acid  titrated  so  as  to  exactly  satur- 
ate 25  centigrams  of  pure  morphia  dried  at  I20°C.  This  liquor  con- 
tains in  a  liter  4*30  grams  of  monohydrated  sulphuric  acid  (S03,H20). 
On  the  other  hand  a  solution  of  sucrate  of  lime  is  prepared  of  a 
strength  that  10  cc.  should  saturate  exactly  10  cc.  of  the  sulphuric 
solution.  It  remains  then  only  to  ascertain  how  much  of  the  sulphuric 
solution  would  be  saturated  by  25  centigrams  of  the  morphia  obtained 
in  the  various  assays . 
If  the  25  centigrams  should  saturate  exactly  the  10  cc.  of  sulphuric 
liquid  the  morphia  would  be  pure  ;  in  the  contrary  case  the  quantity  of 
real  morphia  contained  in  the  mixture  would  be  given  in  hundredths  by 
the  number  of  tenths  of  cubic  centimeters  of  the  10  cc.  of  sucrate 
of  lime  solution  not  required,  and  which  remain  unused,  for  the  satur- 
ation of  the  10  cc.  of  sulphuric  solution  left  unsaturated  by  the  pre- 
cipitate. In  practice,  in  order  to  facilitate  the  solution  of  the  morphia, 
it  is  preferable  to  employ  20  cc.  of  sulphuric  solution  to  dissolve  the 
