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ON  THE  KINO  OP  EUCALYPTUS  RESINIFERA. 
was  found  to  possess  a  slight  peculiar  odor  somewhat  like  must. 
Its  consistence  is  like  a  mixture  of  one  part  of  syrup  with  two 
of  water,  its  specific  gravity  ;  is  1.048.  When  it  is  evaporated  to 
dryness  it  yields  13  per  cent  of  extract  similar  in  appearance 
and  taste  to  the  kino.  Its  taste  is  strongly  astringent,  followed 
by  a  sweetish  rather  unpleasant  impression  that  recalls  the  odor 
of  the  juice.  When  heated  to  ebullition  the  fluid  remains  per- 
fectly transparent ;  when  mixed  with  three  times  its  bulk  of 
water  it  becomes  cloudy,  but  does  not  immediately  precipitate  ; 
on  heating  gently,  transparency  is  resumed,  to  again  cloud  by 
cooling;  a  little  alcohol  renders  it  permanently  transparent. 
When  the  juice  is  agitated  repeatedly  with  ether,  it  communi- 
cates its  color  to  that  fluid,  and  on  evaporating  the  ether,  a  small 
quantity  of  soft  red  extract  results,  astringent  to  the  taste,  and 
striking  a  greenish  black  color  with  sesquichloride  of  iron. 
With  reagents,  this  juice  behaves  much  as  the  aqueous  solu- 
tion of  the  kino  ;  it  is  precipitated  abundantly  by  gelatin, 
acetate  of  lead,  and  lime  water.  Tartar  emetic  and  corrosive 
sublimate,  each  precipitated  it,  and  the  persalts  of  iron  strike  a 
dirty  greenish  black  color.  Neither  liquor  potassa  nor  ammo- 
nia cause  any  cloudiness,  but  darken  the  color  of  the  aqueous  so- 
lution. Dr.  Pereira  believed  that  Botany  Bay  kind  contains, 
besides  tannic  acid,  a  peculiar  pectin-like  body,  which  he  has 
called  eucalyptin.  He  indicates  eucalyptin  by  its  property  of 
being  precipitated  from  the  alcoholic  tincture  of  this  kino  on  the 
addition  of  ammonia,  or  solution  of  potassa.  When  half  a 
drachm  of  the  juice  was  diluted  with  two  drachms  of  alcohol,  the 
solution  was  precipitated  by  both  ammonia  and  potassa,  of  a 
dark  brown  color — corroborating  the  observation  of  Pereira. 
As  the  specimen  of  Eucalyptus  juice  above  described  is  seve- 
ral years  old,  and  does  not  exhibit  the  slightest  indication  of 
decomposition,  there  can  be  little  doubt  of  its  being  a  valuable 
astringent  medicine  where  it  is  within  the  reach  of  the  physi- 
cian. It  is  quite  probable,  however,  that  if  exposed  to  the  ac- 
tion of  the  air,  it  would  gelatinize  and  lose  its  astringency,  as 
its  tannic  acid  appears  analogous  to  that  of  the  Pterocarpus  eri- 
naceus. 
