686 
Aromadendrin. 
f  Am.  Jour.  Pharm. 
\  December,  1896. 
bility  in  cold  water,  its  crystallizing  in  needles  with  water,  and  a 
few  other  reactions — yet,  it  differs  from  catechin  in  its  composition, 
its  reaction  with  ferric  chloride,  its  not  forming  pyrocatechin  on 
heating  in  glycerol  from  2200  to  2300  C.  for  half  an  hour,  its  differ- 
ent reactions  with  potash  solution  and  sulphuric  acid,  and  its  not 
imparting  brown  tints  to  cotton  cloth  when  boiled  with  solutions  of 
sulphate  of  copper  and  potassium  bichromate,  it  having  very  little 
dyeing  properties. 
We  must  admit  the  family  likeness,  however,  and  if  we  consider 
the  composition  of  the  members  of  the  catechin  group,  and  the  rela- 
tions of  the  catechin  tannins,  we  cannot  but  recognize  the  probabil- 
ity that  eventually  some  connection  will  be  found  to  exist  between 
Aromadendrin  and  the  tannins  of  the  turbid  group  of  Eucalyptus 
kinos. 
The  reactions  of  the  products  obtained  by  fusing  Aromadendrin 
with  caustic  potash  indicate  that  both  phloroglucol  and  protocate- 
chuic  acid  are  formed. 
Kinoin,  from  Malabar  kino,  is  a  body  also  allied  in  some  respects 
to  catechin,  and  in  some  of  its  reactions  to  Aromadendrin. 
When  Aromadendrin  has  been  heated  in  glycerol,  the  ether  re- 
moves a  yellow,  resinous-looking  body,  which  is  almost  insoluble  in 
cold  water,  but  instantly  soluble  in  alcohol,  forming  a  yellow  solu- 
tion of  great  staining  power ;  dyeing  the  skin,  wool,  etc.,  a  bright 
yellow.  This  is  an  alteration  product  that  may  be  considered  as 
kino-yellow,  and  is  worthy  of  further  investigation.  Kino-yellow  is 
also  obtained  when  Aromadendrin  is  heated  above  its  melting-point. 
Aromadendrin  is  almost  tasteless,  being  perhaps  slightly  sweetish. 
It  has  no  odor. 
Although  the  term  aromadendric  acid  has  been  used  for  this  sub- 
stance, it  should  only  be  so  considered  in  the  sense  already  adopted 
for  catechuic  acid,  as  the  acid  qualities  of  the  former  are  but  slightly 
greater  than  are  those  of  the  latter  ;  but  it  may  eventually  be  proved 
to  form  one  of  a  series  of  the  tannic  acids  of  the  Eucalypts,  and 
may  probably  be  a  starting-point  for  those  as  yet  but  little  investi- 
gated bodies. 
The  ready  isolation  and  determination  of  these  two  bodies,  eudes- 
min  and  Aromadendrin,  will  assist  in  the  elucidation  of  many  prob- 
lems connected  with  the  large  group  of  Eucalyptus  kinos,  known  as 
the  "  turbid  group,"  and  will  enable  it  to  be  broken  down  on  a 
