CINCHONA  BARK  AND  ITS  ALKALOID. 
117 
bidity,  which  rapidly  caked  together  into  pale  citron-yellow 
flakes.  Perchloride  of  platinum  furnished  a  pale  orange-yellow, 
finely  flocculent  precipitate,  which  underwent  no  further  change. 
Protonitrate  of  palladium  gave  a  pale  orange-yellow,  finely  floc- 
culent precipitate,  which  also  remained  its  original  nature.  Sul- 
phocyanide  of  potassium  produced  a  white  turbidity,  which 
quickly  united  into  a  granular  crystalline  form,  and  adhered 
firmly  on  the  walls  of  the  vessel.  Iodide  of  potassium  the  same, 
except  that  the  transition  to  the  granular  crystalline  form  took 
place  more  slowly.  Biniodide  of  potassium  gave  a  strong  brown- 
ish-yellow precipitate  united  into  thick  flakes.  Tannic  acid,  a 
milk-white,  finely  flocculent  precipitate,  which  underwent  no 
further  change  in  its  appearance. 
By  distillation  with  potash,  the  alkaloid  appears  to  furnish 
chinoline.    Analysis  : — 
C  77-363  77-272  18  1350  77-143 
H  7  185  7-296  10  125  7-143 
N  9-896  ..  1  175  10-000 
O          ..  ..  1  100  5-714 
The  platinochloride  is  a  pale  orange-colored  precipitate,  tolera- 
bly hygroscopic.  It  contained  28*47  and  28-49  per  cent,  of 
platinum  (calculated,  28495).  This  alkaloid  is  homologous  with 
cinchonine,  C20  H12  NO,  cinchonine— C2H2==:C18  H10  NO,  cin- 
chonidine. 
In  the  investigation  of  the  bark,  &c,  T.  Crawford  and  II. 
Krombach  took  part.  The  following  analysis  of  the  ashes  of  the 
new  bark  was  made  by  the  latter  chemist.  The  ashes  consist 
for  the  most  part  of  carbonate  of  lime. 
1000  grs.  of  air-dried  powdered  bark  lost  ?5  grs.  by  drying  at 
212°  F.  The  remaining  925  grs.  furnished  19-96  grs.  of  tolera- 
bly white  ashes.  The  amount  of  ash  in  the  air-dried  bark  there- 
fore is  1-996  per  cent,,  and  in  the  bark  dried  at  212°  F.  2-157 
per  cent.    The  composition  of  the  ashes  was — 
Potash       .  .  5-32  Chlorine       .  .  2  23 
Soda         .  .  5-82  Sulphuric  acid  .  3-62 
Lime         .  .  38-73  Phosphoric  acid  .  3-31 
Magnesia   .  .  0-50  Silica           .  .  6-33 
Alumina    .  .  1-00  Carbonic  acid  .  32-33 
Oxide  of  iron  .  0-80 
Chem.  Gfaz.,  Jan.  15,  1857,  from  Wittsteins  Vierteljahr. 
