AmMJa°rU,r'i87h8!rm"}     Resins,  Gum  Resins  and  Balsams,  131 
b.  Bromine  solution  produces  no  color — Para  Copaiba  Balsam. 
2.  The  drug  is  solid  and  dissolves  only  partially  in  petroleum  spirit.  Iodine 
solution  colors  red-violet — Ordinary  Mastic. 
Ethereal  solution  forms  clear  mixture  ivitb  alcohol. 
I.  Perfectly  soluble  in  alcohol. 
r.  Perchloride  of  iron  colors  the  alcoholic  solution  blue. 
a.  Lead  acetate  gives  a  precipitate  with  alcoholic  solution.    Sulphuric  acid  dis- 
solves the  drug  with  a  cherry-red  color — Guaiacum  Resin. 
b.  Lead  acetate  gives  no  precipitate.    Sulphuric  acid  dissolves  the  drug  with  a 
yellow-brown  color — Carana  Resin  (  Aceyta  americana). 
2.  Perchloride  of  iron  colors  the  alcoholic  solution  brownish  or  greenish. 
a.  Lead  acetate  gives  with  the  alcoholic  solution  a  precipitate  that  is  not  dissolved 
by  boiling. 
a.  Sodium  carbonate  solution  dissolves  parts  at  the  ordinary  temperature. 
Chloral  test  colors  the  residue  from  the  evaporation  of  a  petroleum  spirit 
extract  gradually  red-violet  with  blue  streaks — Coniferous  Balsams  and 
Resins. 
$.  Sodium  carbonate  dissolves  none  or  a  very  small  quantity. 
a.  Petroleum  spirit  extract  colorless.    Chloral  test  produces  no  color  or  a 
very  faint  greenish — Bombay  Mastic. 
B   Petroleum  extract  colored. 
C.  Dark  brown.    Chloral  test  colors  brown — Mani  Resin. 
D.  Yellow-brown.  Chloral  test  colors  gradually  indistinct  red  violet — Carana 
Resin. 
e.  Yellow-brown.    Chloral  test  and  bromine  solution  color  a  magnificent 
violet — Carana  hedionda. 
b.  Lead  acetate  gives  with  alcoholic  solution  a  precipitate  that  dissolves  on 
boiling. 
a..  Bromine  solution  colors  red — Peruvian  Guaiacum  Resin. 
0.  Bromine  solution  produces  no  coloration — Alexandrian  Mastic. 
c .  Lead  acetate  gives  no  precipitate.  Ammonia  gives  a  turbid  mixture — Dragon's 
blood. 
II.  Imperfectly  soluble  in  alcohol. 
1.  Lead  acetate  produces  turbidity  which  disappears  upon  warming — Brazilian 
Copaiba  Balsam. 
2.  Lead  acetate  gives  no  precipitate.    The  drug  is  clearly  crystalline.  Sodium 
carbonate  does  not  dissolve  it  by  boiling. 
a.  Bromine  solution  gradually  colors  green. 
a.  Alcoholic  hydrochloric  acid  colors  violet,  blue  or  brown — Elemi. 
b.  Bromine  solution  colors  violet — Elemi. 
c.  Bromine  solution  produces  no  color — Elemi  (Amyris  elemifera). 
IMPERFECTLY  SOLUBLE  IN  ETHER. 
Perfectly  soluble  in  alcohol. 
I.  Sulphuric  acid  colors  the  residue  from  evaporation  of  a  petroleum  spirit  extract 
cherry-red.    The  drug  is  free  from  cinnamic  acid — Siam  Benzoin. 
II.  Sulphuric  acid  does  not  color  such  residue,  or  only  faintly  brown.  Contains 
tains  cinnamic  acid — Sumatra  Benzoin  or  Tolu  Balsam. 
III.  Sulphuric  acid  colors  such  residue  yellow-brown  passing  into  violet — Black 
Peru  Balsam. 
Imperfectly  soluble  in  alcohol. 
I.  Perchloride  of  iron  gives  a  precipitate,  which  is  neither  dissolved  by  boiling  nor 
soluble  in  ether — Brazilian  Copal. 
II.  Perchloride  of  iron  produces  no  turbidity  or  only  a  slight  one  that  disappears  on 
boiling. 
1.  The  ethereal  solution  gives  with  alcohol  a  turbid  mixture. 
