$8o 
Australian  Myrtaceons  Kinos. 
/Am.  Jour.  Pharm. 
I  November,  1895. 
pyrogallol,  and  a  yellowish,  resinous-looking  body,  difficultly  soluble 
in  cold  water,  but  soluble  in  boiling  water,  was  also  removed  by  the 
ether  at  the  same  time. 
This  reaction  shows  that  the  tannic  acid  was  not  one  likely  to 
give  ellagic  acid  as  a  decomposition  product. 
When  portions  of  these  same  tannins  were  heated  in  a  closed 
tube  for  one  hour,  at  ioo°  C,  with  dilute  hydrochloric  acid,  a  body 
in  appearance  allied  to  one  of  the  red  decomposition  products  known 
as  kino  red,  elm  red,  hemlock  red,  etc.,  is  obtained  as  a  product  of 
decomposition.  From  these  results,  although  we  might  be  inclined 
to  look  for  two  tannic  acids,  we  must  conclude  that  there  is  but  one 
tannic  acid  in  the  kino  of  Eucalyptus  hemiphloia. 
As  the  whole  of  the  tannin  of  Angophora  lanceolata  kino  is  pre- 
cipitated by  neutral  acetate  of  lead,  we  may  infer  the  same  also  of 
this  kino,  the  decomposition  products  of  the  tannin  obtained  from 
the  lead  precipitate  being  catechol  when  decomposed  by  heating  at 
200°  C.  for  half  an  hour,  and  protocatechuic  acid  and  acetic  acid 
when  decomposed  by  fusing  with  potash. 
From  the  decomposition  products  of  the  tannins  from  Eucalyptus 
hemiphloia  kino,  and  from  Angophora  lanceolata  kino,  we  consider 
them  identical. 
As  already  stated,  there  is  a  resinous-looking  substance  extracted 
with  eudesmin  by  ether  from  the  kino  of  Eucalyptus  hemiphloia. 
As  this  is  soluble  in  boiling  water  (with  difficulty,  as  it  melts  into 
greasy-looking  masses),  but  separates  again  on  cooling,  we  must 
consider  that  this  substance  also  plays  a  part  in  the  turbidity  of  this 
kino  as  well  as  eudesmin.  This  body,  when  allowed  to  precipitate 
from  boiling  water,  is  removed  from  the  aqueous  solution  by  agitat- 
ing with  ether,  the  liquid  becoming  quite  clear,  demonstrating  that 
the  whole  of  the  bodies  causing  this  turbidity  have  been  removed. 
As  the  ether  slowly  evaporates,  crystals  form  at  the  junction  of  the 
ether  and  water  ;  these  fall  through  the  liquid  to  the  bottom  of  the 
vessel,  either  by  themselves  or  when  the  vessel  is  gently  agitated. 
We  have  only  just  succeeded  in  crystallizing  this  substance,  to  which 
we  have  given  provisionally  the  name  aromadendrin,  and  a  subse- 
quent communication  will  be  made  to  the  Society  when  its  chemistry 
has  been  worked  out. 
As  seen  under  the  microscope  the  crystals  are  plates.  In  the 
early  state  of  crystallization  the  rhombus  is  the  principal  form,  but, 
