424 
ALKALOIDS  IN  THE  CINCHONA  BARKS. 
sulphate  of  a  quinidine,  employed  for  the  following  experiments, 
was  1  part  in  223.  1  c.c.  of  a  solution  of  the  sulphate  saturated 
in  the  cold,  when  treated  with  the  above  test  solutions  of  Liq. 
ammonise,  till  the  precipitate  which  appeared  at  first  had  com- 
pletely redissolved,  required 
Of  Liq.  Am.,  A.  Of  Liq.  Am.,  B. 
10-7  c.  c.  12-6  c.  c. 
10-  8    «  12-8  « 
11-  0  «  12-7  « 
11-0  «  12-8  « 
10-9   «  12-8  " 
1  c.  c.  therefore  requires  from  10-5  to  11  times  more  of  the 
test-liquor  A  than  a  corresponding  quantity  of  a  solution  of 
sulphate  of  quinine  saturated  in  the  cold. 
3.  P  Quinidine  Solubility  of  the  sulphate  in  water  of  15°  C. 
(a)  of  a  sample  prepared  in  the  year  1859,  1 :  112. 
(b.)  of  a  sample  prepared  in  the  year  1860,  1 :  105-5. 
1  c.  c.  of  a  solution  of  these  samples,  saturated  in  the  cold, 
required,  in  order  to  produce  the  above  reaction — 
Of  Liq.  Am.,  A.  Of  Liq.  Am.,  B. 
For  sample  A,  on  an  average  14-3  c.  c.       on  an  average  15-2  c.  c. 
«        it      Bj      «  u        i4Q    u  a  it        15.6  « 
or  about  12  times  more  than  a  solution  of  the  pure  quinine 
salt.  After  standing  for  half  an  hour  the  ammoniacal  solution 
became  turbid,  and  the  alkaloids  separated,  probably  com- 
pletely, in  the  form  of  small  granular  crystals,  which  were  not 
redissolved  even  in  a  large  excess  of  NH40. 
4.  y  Quinidine. — Solubility  of  the  sulphate  in  water  of  15° 
C.  =JL. 
205 
1  c.  c.  of  a  solution,  saturated  in  the  cold,  required  on  an 
average  of  Liq.  am.  A,  10-9  ;  of  Liq.  am.  B.  12-5. 
5.  Qinclionidine. — The  sulphate  of  cinchonidine  of  commerce 
contains  frequently  considerable  quantities  of  quinidine,  some- 
times also  traces  of  quinine.  Its  insolubility  in  water  of  15°  C. 
varies  from  —  to  * 
98  110 
1  c.  c.  of  a  solution  of  the  sulphate  of  cinchonidine,  saturated 
in  the  cold,  required  on  an  average  of  Liq.  am.  A,  16  c.  c. ;  of 
