272 
Covimercial  Aloes. 
Am.  Jour.  Pharin. 
June,  1903. 
Aloes  A — containing  barb-aloin  ;  responds  to  Borntraeger's  test  for 
emodin,  but  does  not  give  a  distinct  red  color  with  nitric  acid,  or 
with  Klunge's  test. 
Aloes  B — contains  iso-barb-aloin  with  barb-aloin ;  responds  to 
Borntraeger's  test  for  emodin,  and  also  gives  a  deep  red  color  with 
strong  nitric  acid  or  with  Klunge's  test. 
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