Am.  Jour.  Pharm.  t 
December,  1896.  J 
A  romadendrin. 
683 
It  may  be  well  to  direct  attention  to  the  danger  of  a  mixed 
compound  when  preparing  these  substances.  The  plates  of  the 
second  body  mentioned  in  the  former  paper  evidently  consisted  of 
such,  and  contained  enough  "  eudesmin  "  to  alter  the  melting  point, 
as  they  gave  a  melting  point  of  1620  C.  Later,  a  purer  product 
of  Aromadendrin  was  obtained  from  the  kino  of  E.  hemiphloia,  which 
melted  at  1920  C,  while  the  melting  point  of  pure  Aromadendrin  is 
2160  C. 
Aromadendrin  is  readily  soluble  in  ether,  acetic  ether,  rectified 
spirit  and  amyl  alcohol ;  but  is  almost  insoluble  in  chloroform.  It 
is  insoluble  in  benzole  and  petroleum  spirit.  When  dissolved  in 
those  solutions  mentioned,  the  crystals  left  on  evaporation  all  tend 
to  form  acicular  radiating  tufts ;  this  is  so  when  slowly  crystallized 
from  water,  alcohol,  dilute  acetic  acid,  ether  and  acetic  ether,  and  it 
appears  difficult  to  obtain  crystals  of  fair  size  from  any  solution. 
The  first  crystals  obtained  from  the  solution  in  absolute  alcohol, 
although  impure,  appear  to  be  of  larger  size  than  by  any  other 
method. 
Aromadendrin  also  gives  the  following  reactions,  the  cold  aque- 
ous solution  of  the  substance  being  taken  for  the  determinations, 
except  as  otherwise  mentioned.  The  small  amount  of  the  substance 
in  solution  is  not  sufficient  to  redden  litmus,  although  a  stronger 
solution  in  hot  water  does  so  readily.  With  solution  of  acetate  of 
lead  a  yellow-colored  precipitate  is  formed ;  in  a  stronger  solution 
in  hot  water  a  dense  precipitate  forms  of  a  yellow-chrome  color, 
becoming  ochre-yellow  on  drying. 
With  solution  of  sulphate  or  acetate  of  copper  a  light  greenish 
precipitate  is  formed  ;  this  is  much  more  copious  in  a  strong,  hot 
solution  of  the  substance. 
Acetate  of  zinc  or  acetate  of  cobalt  both  fail  to  form  a  precipitate, 
the  salts  being  soluble. 
Gold  chloride  gives  a  purple .  color,  the  dilute  solution  of  gold 
being  readily  reduced. 
Silver  nitrate  gives  no  precipitate,  but  is  reduced  ;  this  very  readily 
takes  place  in  a  hot,  strong  solution  of  the  substance,  a  bright  silver 
mirror  being  formed. 
Ammonio-nitrate  of  silver  is  readily  reduced. 
Fehling's  solution  is  also  reduced  on  heating. 
Gelatine  gives  no  precipitate. 
