552  PROXIMATE  ANALYSIS  OF  »  K  AM  ALA." 
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The  filtrate  from  the  lead  precipitates  was  treated  with 
carbonate  of  ammonia,  and  filtered  from  the  carbonate  of  lead. 
The  liquid  was  tested  for  lactic  acid  and  sugar,  with  negative 
results. 
The  dry  resin,  after  the  treatment  with  water,  weighed  22-8 
grms.;  it  appears  to  contain  the  active  portion  of  the  constituents 
of  k  a  mala.  It  is  soluble  in  boiling  alcohol ;  about  one-fifth 
separated  on  cooling,  with  a  somewhat  lighter  reddish  yellow 
color.  Both  portions  are  brittle,  soluble  in  caustic  potassa  with 
a  red  color,  and  precipitated  by  acids  without  alteration ;  with 
the  aid  of  some  heat  they  dissolve  in  ammonia  and  alkaline 
carbonates.  The  readily  soluble  resin  fuses  at  80°  0.  (176°  F.), 
the  other  at  191°  C.  (376°  F.)  They  could  not  be  obtained  in 
a  crystalline  state,  are  not  glucosides,  yield  with  nitric  acid 
oxalic  acid,  and  left  «6  and  .4  per  ct.  ashes,  respectively.  The 
chemical  composition  of  the  first  resin  is  C30  H18  08  ;  of  the 
second,  C16  H12  O10.  The  color  appears  to  be  peculiar  to  the 
resins.    Dr.  Anderson's  rottlerin  could  not  be  obtained. 
The  above  residue  of  26-850  grms.  had  the  color  of  hydratecl 
sesquioxide  of  iron.  The  alcoholic  tincture  yielded  a  small 
quantity  of  a  brittle  resin,  soluble  in  ether  and  ammonia ;  no 
further  attention  was  paid  to  it.  Boiling  water  extracted  from 
it  neither  sugar,  lactic  or  citric  acid ;  otherwise  the  solution 
showed  the  same  behaviour  as  the  aqueous  decoction  of  the 
ethereal  extract. 
25-460  grms.  were  left  after  the  treatment  with  alcohol ;  no 
albumen  or  sugar  could  be  detected.  After  boiling  with  wafcer,  a 
residue  of  23-450  grms.  remained  behind.  The  decoction  con- 
tained a  little  starch,  gum  and  so-called  extractive;  it  had  a 
brown  red  color  and  an  insipid  taste. 
After  digesting,  with  diluted  muriatic  acid,  the  dry  residue 
weighed  19-700  grms.;  the  filtrate  contained  oxalic  acid,  sesqui- 
oxide of  iron  and  lime. 
On  treating  the  residue  with  potassa,  and  precipitating  the 
deep  brown  filtrate  with  muriatic  acid,  the  precipitate  was 
blackish  brown,  brittle,  of  a  resinous  lustre,  and  evolved  ammo- 
nia, along  with  empyreumatic  products  when  heated  in  a  test- 
tube  ;  it  was  a  humus-like  acid,  with  some  albuminous  matter. 
The  dried  residue  now  weighed  16-340  grms.   and  yielded 
