68o 
Aromadendrin. 
/ Am.  Jour.  Pharm. 
X   December,  1896. 
(Aromadendrin)  should  have  been  worked  out.  Through  the 
transference  of  Mr.  Maiden  to  the  Directorship  of  the  Botanic 
Gardens,  the  work  of  continuing  this  research  has  devolved  upon 
me.  It  is  with  pleasure  that  I  am  enabled  to  lay  before  the  Society 
the  results  of  my  investigation  in  this  direction. 
Some  short  time  since,  the  Bureau  of  Agriculture  for  Western 
Australia  forwarded  to  the  Technological  Museum  a  sample  of  the 
kino  of  the  red  gum,  Eucalyptus  calophylla,  R.  Br.,  and  in  investi- 
gating this  kino,  which  belongs  to  the  turbid  group  of  Eucalyptus 
kinos,  it  was  found  that  the  turbidity  was  caused  by  the  second 
body  found  in  the  kino  of  Eucalyptus  hemiphloia  and  named  Aroma- 
dendrin. It  was  also  found  that  "  eudesmin  "  was  entirely  absent- 
This  was  a  most  gratifying  discovery,  as  it  has  enabled  me  to  make 
this  investigation  upon  a  pure  substance,  free  from  "  eudesmin,"  the 
presence  of  which  in  a  kino  makes  it  exceedingly  difficult  to  obtain 
Aromadendrin  sufficiently  pure  for  research  purposes,  at  all  events 
with  our  present  known  methods  of  separation.  Whether  its 
insolubility  in  chloroform  can  be  utilized  to  separate  it  successfully 
from  "  eudesmin,"  which  body  is  readily  soluble  in  that  liquid,  is  a 
matter  for  further  investigation. 
METHOD  OF  PREPARATION.  v 
The  fine  powder  of  this  kino  was  treated  with  a  small  quantity  of 
water  and  placed  in  separator  for  the  attempted  determination  of 
"  eudesmin,"  as  fully  described  under  that  substance,  in  the  paper 
already  referred  to.  The  ether  was  more  reddish-brown  than  was 
the  case  with  the  kino  of  E.  hemiphloia,  and,  when  distilled  to  dry- 
ness, did  not  deposit  tufts  of  crystals,  as  was  the  case  in  that  of  the 
latter  kino  under  the  same  condition.  When  tested  for  the  charac- 
teristic color  reactions  of  "  eudesmin,"  it  was  found  that  that  body 
was  absent,  and  that  apparently  the  whole  consisted  of  Aromaden- 
driny  giving  the  same  color  reactions  as  that  body  before  described. 
The  residue,  after  the  ether  had  been  distilled  off,  was  more  diffi- 
cult to  crystallize  out  than  "  eudesmin,"  the  solution  requiring  to  be 
cooled  considerably  before  it  could  be  obtained  in  any  quantity,  and 
it  also  required  to  stand  some  hours  when  only  the  smallest  possible 
quantity  or  absolute  alcohol  had  been  used  for  solution.  When 
these  crystals  are  filtered  off,  they  cannot  be  washed  with  rectified 
spirit,  as  they  are  readily  soluble  in  that  liquid,  but  may  be  washed 
