132  Scheme  for  the  Recognition  of  {AmiiarU^7h£r,D' 
a.  Alcoholic  hydrochloric  acid  colors  it  brownish.    Chloral  test  colors  evapora- 
tion residue  of  petroleum  spirit  extract  greenish — Dammar. 
b.  Alcoholic  hydrochloric  acid  colors  it  brick-red.  Chloral  test  colors  the  petro- 
leum spirit  residue  carmine-red  to  violet — White  Peru  Balsam. 
2.  Ethereal  solution  gives  with  alcohol  a  clear  mixture. 
a.  Ammonia  gives  with  alcoholic  solution  a  clear  mixture.    Bromine  solution 
colors  blue — Ceradia  Resin. 
b.  Ammonia  gives  with  the  alcoholic  solution  a  turbid  mixture.    Bromine  solu- 
tion colors  greenish — Mecca  Balsam. 
IMPERFECTLY  SOLUBLE  OR  INSOLUBLE  IN  CHLOROFORM. 
COMPLETELY  SOLUBLE  IN  ETHER. 
Etherial  solution  red.    Ammonia  gives  with  alcoholic  solution  a  clear  mixture — Dra- 
gon's Blood  from  Pterocarpus  Draco. 
Ethereal  solution  yellowish  or  colorless. 
I.  Alcoholic  solution  gives  with  lead  acetate  no  precipitate — Podocarpus  Resin. 
II.  Alcoholic  solution  gives  with  lead  acetate  a  precipitate  that  is  not  dissolved  by 
boiling — Sandarac. 
IMPERFECTLY  SOLUBLE  IN  ETHER. 
Ethereal  solution  becomes  turbid  after  addition  of  alcohol. 
I.  Alcoholic  solution  gives  with  ammonia  a  clear  mixture. 
1.  The  mixture  with  ammonia  is  yellow.    The  solution  of  the  resin  in  sulphuric 
acid  is  yellow-brown  and  gives  with  alcohol  a  clear  violet  mixture — Eryops 
Resin. 
2.  The  mixture  with  ammonia  is  carmine  red — Sonora  Lac. 
II.  Alcoholic  solution  gives  with  ammonia  a  turbid  mixture. 
1.  Perchloride  of  iron  colors  green.    The  drug  contains  cinnamic  acid.  'Lead 
acetate  gives  a  precipitate — Liquid  Storax. 
2.  Perchloride  of  iron  colors  brownish  or  not  at  all. 
a.  The  drug  contains  cinnamic  acid,  and  gives  with  lead  acetate  no  precipitate 
— Liquidambar  Balsam. 
b.  The  drug  contains  no  cinnamic  acid,  and  gives  with  lead  acetate  a  precipitate 
— Euphorbia  Tirocalli  Resin. 
Ethereal  solution  gives  with  alcohol  a  clear  mixture. 
I.  Perfectly  soluble  in  alcohol.    Perchloride  of  iron  colors  dark  brown  or  black. 
1.  Solution  in  alcohol  is  red. 
a.  Lead  acetate  gives  no  precipitate.    Chloroform  extract  colorless — Xanthor- 
rhoea  quadrangularis  Resin. 
b.  Lead  acetate  produces  turbidity.    Chloroform  extract  yellow — Xanthorrhcea 
arborea  Resin. 
2.  Alcoholic  solution  yellow.    Lead  acetate  produces  a  precipitate — Yellow  Xan- 
thorrhoea  Resin. 
II.  Imperfectly  soluble  in  alcohol. 
1.  Alcoholic  solution  gives  with  ammonia  a  clear  mixture. 
a.  Ammoniacal  mixture  is  violet.    Lead  acetate  gives  a  violet  precipitate — Lac. 
b.  Ammoniacal  mixture  is  yellow  or  colorless. 
a.  Perchloride  of  iron  colors  the  alcoholic  extract  black.    Lead  acetate  gives 
no  precipitate — Gamboge. 
/?.  Perchloride  of  iron  gives  a  preipitate  which  is  neither  soluble  in  ether  or  by 
heating.    Lead  acetate  gives  a  precipitate. 
a.  Readily  aud  completely  soluble  in  ether-alcohol, 
c.  Bromine  solution  precipitates  the  resin  from  the  chloroform  solution — 
Australian  Copal. 
D.  Bromine  solution  produces  no  precipitate — Manilla  Copal. 
B.  Imperfectly  soluble  in  ether-alcohol — East  Indian  Copal.     African  CopaL 
