^"aS'Jjs^™  }  ChemkaL  Examination  of  Cincho-^inine.  1 5 j 
formed.  These  were  collected  on  a  filter,  washed  with  a  little  dilute 
alcohol,  dried  and  weighed.  The  so  purified  herapathit  weighed  0'054O 
grams,  corresponding  to  0*0305  grams  of  pure  quinia  from  4*513  grams 
of  the  precipitated  alkaloids,  [J  2),  which,  calculated  for  the  entire 
precipitate  [J  2)  obtained,  is  0*0307  grams,  or  o-6i2  percent,  of  the 
5*0  grams  of  cincho-quinine  used. 
Quantitative  results  No,  6. — Cincho-quinine^  sample  No.  2,  contains  of 
pure  quinia  0*6 1 2  per  cent. 
B  3. — The  filtrate  and  washings — B  2 — from  which  both  the  impure 
and  pure  herapathit  had  been  obtained,  were  mixed,  decolorized  with 
alcoholic  solution  of  sulphurous  acid,  and  evaporated  to  dryness.  The 
residue  was  dissolved  in  dilute  hydrochloric  acid,  precipitated  by  ammo- 
nia, the  precipitate  washed  and  dried.  This  precipitate  was  subjected 
to  the  following  qualitative  examination  : 
A  portion  was  dissolved  in  dilute  sulphuric  acid,  a  little  acetic  acidl 
was  added,  and  then  tincture  of  iodine.  The  brick-red  deposit  formed 
was  redissolved  by  the  aid  of  gentle  heat,  and  the  mixture  was  then 
allowed  to  stand  over  night.  Next  morning  a  brick-red  crystalline 
deposit  had  formed,  which  was  entirely  free  from  the  green-black  crvs- 
tals  of  herapathit. 
The  remainder  was  dissolved  in  dilute  hydrochloric  acid,  and  the 
solution  was  treated  with  chlorine  water  and  ammonia,  which  produced 
a  green  color,  and  with  chlorine  water,  ferrocyanide  of  potassium,  and 
ammonia,  which  produced  a  red  color.  But  in  neither  instance  was  the 
color  as  intense  as  when  corresponding  quantities  of  sulphate  of  quinia 
or  of  sulphate  of  quinidia  were  subjected  to  the  same  tests.  This  dif- 
ference we  ascribe  to  the  presence  of  cinchonia,  and,  possibly,  also  to 
cinchonidia,  the  ether  dissolving  portions  of  both  of  these  alkaloids,  if 
present.  We  therefore  unhesitatingly  arrive  at  the  following  con- 
clusions : 
Result  No.  7. —  The.^  in  ether ^  soluble  portion  of  cincho-quinine  is  com- 
posed^ 
of  a  small  proportion  of  quinia  ; 
1.^  of  a  large  proportion  of  quinidia ; 
'^'i  of  a  small  proportion  of  cinchonia ; 
4,  (probably)  of  a  small  proportion  of  cinchonidia. 
Remarks. — We  wish  it  to  be  positively  understood  that  we  intend 
to  convey,  by  what  we  have  said  in  the  above  relating  to  Experiments 
B^  that  we  have  determined  quantitatively  only  the,  in  ether,  soluble 
