CHEMICAL  COMPOSITION  OF  QUIN1DINE. 
167 
yellowish  crystals,  which  are  monoklinometric,  and  have  the  ap- 
pearance of  rhombic  prisms. 
Perfectly  dried  over  sulphuric  acid  at  100°,  the  acid  muriate  of 
quinidine  lost  5.8  per  cent,  of  water.  It  is  easily  soluble  both  in 
water  and  spirit  of  wine.    In  100  parts  were  : 
Found.  Calculated. 
i.  ii.  in. 
Carbon  .    .    .   58.30  —      ...  57.93 
Hydrogen,  .    .     7.12  —       ...  6.97 
Chlorine,    .    .      —     .  .  .  18.96  .  .  .     19.00     .  .  .  18.99 
Corresponding  formula : 
C36H22  N2  02  2HC12  +  2H0. 
Platinum-Chloride  of  Quinidine. — The  most  beautiful  crystals 
of  the  muriate  of  quinidine  were  dissolved  in  water,  the  solution 
diluted,  acidulated  with  muriatic  acid,  and  chloride  of  platinum 
added  as  long  as  a  precipitate  was  obtained.  The  orange-yellow 
precipitate  was  then  placed  on  a  filter  and  washed  with  acidulated 
water  till  chloride  of  platinum  was  no  longer  detected  in  the 
washings.  The  precipitate  dried  at  100°,  was  burnt,  and  gave 
the  following  results.    In  100  parts  were  : 
Found.  Average  of 
,  '  s  experiments 
i.  ii.  in.  calculated. 
Platinum,   .  ;    27.05    .  .    27.17    .  .   27.13    .  .   27.11  27.04 
These  numbers  correspond  to  the  formula : 
C36  H22  N2  02>  2  H  CI,  2  PI  Cl2_|_4  HO. 
Mercury-chloride  of  Quinidine. — Pure  quinidine  was  dissolved 
by  the  aid  of  heat  in  alcohol  of  85  per  cent,  acidulated  with 
muriatic  acid  and  an  equal  weight  of  bichloride  of  mercury  dis- 
solved in  ether,  added  to  the  solution.  When  the  mixture  had 
become  cold,  the  mercury-chloride  of  quinidine  was  obtained  in 
the  form  of  small  scaly  pearly  crystals,  which  dissolved  with  great 
difficulty  in  water.  The  crystals  were  placed  on  a  filter,  thorough- 
ly washed  and  pressed  between  folds  of  filtering-paper ;  when 
dried  over  sulphuric  acid  they  lost  no  water  at  1 10°. 
In  100  parts  were : 
