ADecJemberhS"}  0n  Some  °f  the  Tests  for  Quinine.  $67 
3.  01  c.c.  of  a  i-iooth  quinine  solution,  yields  with  one  drop  of 
bromine  water  and  a  drop  of  ammonia,  a  white  precipitate  which 
quickly  assumes  a  green  color. 
B.  i-ioooth  solution  of  quinine. 
1.  5  c.c.  of  the  solution  yields  with  one  drop  of  ammonia,  after 
adding  : 
(a)  One  drop  bromine  water :  a  white  precipitate  which 
soon  assumes  a  bluish-green  color. 
(b)  o-i  c.c.  bromine  :  an  immediate  bright  green  color- 
ation. 
(c)  0  3  c  c.  bromine  water  alone  causes  a  yellow  colora- 
tion, which  on  addition  of  the  ammonia,  is  changed  to 
deep  purple,  and  this  may  slowly  change  to  very  dark 
green. 
2.  1  c.c.  of  the  quinine  solution  with  one  drop  of  the  bromine 
water  and  one  drop  of  ammonia  will  yield  a  bright  green  coloration. 
Under  the  action  of  a  slightly  larger  quantity  of  the  bromine  re- 
agent, only  a  purple  color  will  appear,  or  the  mixture  will  remain 
colorless. 
3.  01  c.c.  of  the  quinine  solution  with  a  minute  drop  of  the  brom- 
ine water  and  one  drop  of  ammonia,  will  yield  a  green  coloration  ; 
but  if  a  full  drop  of  the  bromine  reagent  be  employed,  a  colorless 
mixture  will  result.  With  a  diluted  solution  of  the  bromine  water 
(1:4),  a  fine  green  coloration  may  be  obtained. 
C.  i-5000th  solution  of  quinine. 
1.  5  c.c.  of  the  solution  with  one  or  two  drops  of  the  bromine 
water  and  one  drop  ammonia,  yields  a  good  green  coloration.  With 
a  slightly  larger  amount  of  the  bromine  reagent,  the  mixture 
remains  colorless. 
2.  1  c.c.  of  the  quinine  solution  with  one  drop  of  bromine  water 
and  one  drop  ammonia,  will  after  a  time  acquire  a  green  coloration. 
If  two  drops  of  the  bromine  water  be  employed,  the  mixture  remains 
permanently  colorless. 
3.  0*1  c.c.  yields  with  a  drop  of  the  bromine  reagent,  a  deep 
yellow  color,  which  is  quickly  discharged  to  a  permanently  colorless 
solution  by  a  drop  of  ammonia.  Under  the  action  of  a  drop  of 
diluted  bromine  water  (1:9),  a  bright  green  coloration  may  be 
obtained. 
