578  Australian  Myrtaceous  Kmos.       { A^c- Jour* Pharn 
Tovember,  1895. 
made.  The  percentage  results  obtained  were  practically  the  same 
in  both  cases  : 
Mean  of  Two  Calculated  for 
Combustions.  Co^H^Ot 
Carbon   66*2050  66*383 
Hydrogen   ...       6*5225  6*383 
Oxygen  •  •  •     27*2725  27*234 
IOO'OOOO  IOO'OOO 
From  the  results  of  these  combustions  we  may  consider  C26H30O8 
as  the  empirical  formula  of  eudesmin. 
The  kino  of  Angophora  lanceolata  does  not  appear  to  contain 
eudesmin. 
As  eudesmin  is  soluble  in  hot  water  and  but  slightly  in  cold 
water,  this  property,  of  course,  indicates  that  it  assists  to  give  tur- 
bidity to  aqueous  solutions  of  kinos  ;  but  the  large  proportion  of  a 
resinous-looking  body  extracted  by  ether,  and  left  on  removal  of 
eudesmin,  points  to  the  fact  that  eudesmin  is  not  the  only  substance 
that  causes  this  turbidity. 
As  before  mentioned,  it  has  been  stated  emphatically  that  the 
substance  causing  this  turbidity  is  ellagic  acid.  We  will  submit 
that  ellagic  acid  is  not  present  in  either  the  kino  of  Eucalyptus 
hemiphloia  or  in  that  of  Angophora  lanceolata.  The  ready  solu- 
bility in  boiling  water  of  the  precipitated  substances  on  cooling 
from  a  hot  aqueous  solution  of  the  kino,  by  itself  tends  to  indicate 
that  the  substance  cannot  be  ellagic  acid,  as  this  acid  is  practically 
insoluble  in  water  even  on  boiling.  Its  ready  solubility  in  alcohol 
also  tends  to  indicate  that  it  is  not  ellagic  acid.  As  the  precipitated 
powder  causing  the  turbidity  when  the  kino  of  Angophora  lanceo- 
lata is  treated  with  water  has  been  particularly  mentioned  as  con- 
sisting of  almost  pure  ellagic  acid,  and  as  the  kino  of  Angophora 
lanceolata  does  not  appear  to  contain  eudesmin,  a  portion  of  the 
above  precipitated  powder  (from  cold  water)  was  decomposed  De- 
fusing with  potash.  The  products  of  decomposition  were  found  to 
be  protocatechuic  and  acetic  acids,  which  points  to  the  fact  that  the 
powder  was  not  ellagic  acid. 
The  protocatechuic  acid  is  readily  obtained  in  a  crystalline  state 
by  removing  the  volatile  acids  from  the  solution  acidified  with  sul- 
phuric acid,  with  petroleum  spirit,  and  then  agitating  with  ether. 
We  subjoin  a  tabular  statement  of  the  reactions  obtained  with 
ellagic  acid,  freshly  prepared  from  divi-divi  (pods  of  Caesalpinia 
