^™Mari88i™  }     Researches  on  the  Cinchona  Alkaloids,  107 
perties  as  acetyl-quinia,  Avith  the  exception  that  it  is  perfectly  amor- 
phous, dissolves  somewhat  more  readily  in  ether,  and  deviates  the 
plane  of  polarized  light  to  the  right,  giving  for  the  solution  in  alcoliol 
+  127-6°,  and  in  water  with  3  molecules  HCl,  +158-6°.  By  saponi- 
fication there  is  naturally  formed  from  this  compound  neither  quinia 
nor  quinicia,  but  quinidia.  The  platinum  salt  is  obtained  as  an  amor- 
phous flocculent  precipitate,  which  soon  becomes  crystalline,  and  is 
sparingly  soluble  in  water  and  dilute  acids.  The  gold  salt  is  a  beau- 
tiful yellow  amorphous  precipitate,  which,  on  drying  with  exposure  to 
the  air,  becomes  pulverulent. 
Acetyl-cinchonidia,  Ci9H2i(C2H30)N20,  forms,  after  drying  at  80° 
to  100°C.,  a  brittle  mass,  yielding  a  white  powder,  melting  at  42°C. 
(uncorr.)  It  is  very  readily  soluble  in  ether,  alcohol  and  chloroform, 
but  sparingly  in  water;  its  solution  in  alcohol  deviates  the  ])lane  of 
polarization — 38-4°;  in  water  with  1  molecule  HCl,  — 66-6°,  and 
with  3  molecules  HCl,  — 81-3°.  A  neutral,  concentrated,  warm  aque- 
ous solution  gives  a  milky  precipitate  with  the  tartrate  of  sodium  and 
potassium,  which  again  disappears  on  cooling.  The  platinum  salt  is 
obtained  as  a  yellow  flocculent  precipitate,  which  soon  becomes  trans- 
formed into  aggregations  of  orange-red,  wort-like  crystals.  The  gold 
salt  is  a  beautiful  yellow  amorphous  precipitate,  having  the  formula^ 
C,,H„(C,H30)N,0,2AuCl,H. +H,0. 
Acetyl-homocinchonidia  has  the  composition  of  the  preceding  com- 
pound, and  resembles  it  except  that  it  furnishes  by  saponification  in 
alcoholic  solution  no  cinchonidia,  but  liomocinchonidia,  and  in  its  solu- 
tions acts  somewhat  more  feebly  on  polarized  light,  the  values  obtained 
being  — 34*0°,  — 61-1°  and  — 72-5.  platinum  salt  is  an  orange- 
yellow  amorphous  precipitate,  gradually  changing  into  dark  orange- 
colored  crystals.  The  gold  salt  is  a  beautiful  yellow  amorphous  pre- 
cipitate, almost  insoluble  in  cold  water. 
Acetyl- cinchonia  is  amorphous,  melts  at  a  low  temperature,  and  has,, 
when  dried  at  100°C.,  also  the  formula  C\9H2i(C2H30)N20.  It  may 
be  reduced  to  a  white  powder,  which  is  easily  soluble  in  ether,  alcohol 
and  chloroform.  Its  solution  in  alcohol  shows  a  rotatory  power  of 
+  114-1°,  and  in  water  with  3  molecules  HCl,  =  +  139-5°.  Its  plati- 
num salt  forms  orange-red  crystals.  The  gold  salt  is  a  yellow  amor- 
phous precipitate. 
II.  Action  of  Hydrochloric  Acid,  spec.  grav.  1*125,  on  the  Cinchona 
alkaloids. — After  having  proved  that  quinia,  quinidia,  cinchonidia, 
