Am.  Jour.  Pharm.  > 
December,  1896.  J 
A  romadendrin. 
685 
Theory  requires  for  this  formula  : 
61*484  carbon. 
4'593  hydrogen. 
33-923  oxygen. 
This  agrees  very  well  with  the  percentage  amounts  obtained  by  experiment. 
Combustion  made  on  material  before  heating  to  1200  C.  was  not 
satisfactory,  the  results  of  three  combustions  not  being  sufficiently 
constant.  It  was  found  that  8-86  per  cent,  of  water  was  removed 
by  heating  from  1200  to  1300  C.  in  air  oven,  while  by  heating  in 
water  bath  until  constant  6-1  per  cent,  was  removed.  Taking  the 
formula  as  given  above,  it  is  seen  that  it  requires  3  molecules  of 
water  to  equal  8-71  per  cent.,  so  that  Aromadendrin  crystallizes  with 
3  molecules  of  water ;  two  of  these  molecules  are  removed  at  or 
below  ioo°  C,  while  the  other  is  removed  between  that  temperature 
and  1200  C;  the  formula  for  this  body  is,  before  heating,  therefore, 
C29H26012  -f  3H20.  The  removal  of  these  molecules  of  water  does 
not  form  colored  anhydrides  when  not  heated  beyond  1200  C,  the 
substance  remaining  quite  white.  When  heated  to  melting,  kino- 
yellow  is  formed. 
SOLUBILITY  OF  AROMADENDRIN  IN  COLD  WATER. 
A  portion  of  the  purified  substance  was  dissolved  in  warm  water 
and  allowed  to  cool  to  15-5°  C,  when  the  greater  portion  of  the 
substance  had  crystallized  out.  This  was  filtered  off,  and  a  portion 
of  the  filtrate  evaporated  to  dryness ;  it  was  found  that  the  residue 
equalled  -036  per  cent,  only,  soluble  in  cold  water  at  the  tempera- 
ture given,  or  that  it  required  2,777  parts  of  cold  water  of  that 
temperature  to  dissolve  1  part  of  Aromadendrin. 
Several  attempts  were  made  to  form  salts,  but  owing  to  their 
instability,  the  results  were  not  very  satisfactory.  The  lead  pre- 
cipitate obtained  by  adding  lead  acetate  to  a  hot,  strong  solution 
appeared  the  most  satisfactory.  The  lead  precipitate  thus  obtained 
left  45  per  cent,  of  PbO  on  ignition ;  this  corresponds  to  half  the 
molecule,  or  the  precipitate  obtained  2  atoms  of  lead  in  the  mole- 
cule. 
Although  somewhat  resembling  catechin  in  many  respects,  such 
as  melting  point,  not  precipitating  gelatine,  reduction  of  gold  and 
silver  salts,  its  apparent  action  like  an  acid  (although  but  slightly 
acid  to  litmus),  its  reaction  with  acetate  of  lead,  etc.,  its  slight  solu- 
