c"™jlZ*\m&Tm'}    *  The  Tannin  of  Cloves.  303 
with  paper-pulp,  the  resulting  mixture  filtered,  and  the  clear  filtrate 
shaken  repeatedly  with  ether  to  remove  the  last  traces  of  oil  and 
resin.  From  the  aqueous  layer,  after  the  separation  of  the  last 
portion  of  ether,  the  tannin  was  removed  by  the  addition  of  acetone 
and  subsequent  saturation  of  the  liquid  with  sodium  chloride.  The 
acetone  layer,  which  was  thus  separated,  was  removed,  and  the 
solvent  recovered.  The  residue  was  dissolved  in  water,  the  solution 
filtered,  and  the  filtrate  agitated  with  ether.  The  ether  layer  was 
separated  and  the  aqueous  layer  distilled  under  reduced  pressure  to 
dryness.  The  resulting  tannin  was  of  a  straw-yellow  color.  To 
render  it  more  porous,  the  tannin  was  dissolved  in  a  mixture  of 
absolute  alcohol  and  ether,  and  these  solvents  rapidly  vaporized 
under  greatly  diminished  pressure. 
CLASSIFICATION. 
The  tannin,  isolated  and  purified  by  the  process  already  described, 
was  submitted  to  a  series  of  experiments,  by  means  of  which  its 
chemical  behaviors  and  composition  might  be  ascertained  and  its 
classification  therefrom  decided. 
Reactions.^— -The  following  reactions  were  obtained  from  a  one 
per  cent,  solution  of  the  tannin  in  water.  For  comparison,  the 
reactions  afforded  by  gallotannic  acid  and  white-oak  bark  tannin — 
representatives  of  the  two  classes  of  tannins  now  recognized — are 
placed  beside  those  given  by  the  tannin  of  cloves : 
Reagent. 
Tannin  of  Cloves. 
Gallotannic  acid. 
White  Oak  Bark  Tannin. 
Bromine  water  .... 
Ferric  chloride  .... 
Cobalt  acetate  .... 
Manganese  acetate  . 
Uranium  acetate  .  .  . 
Copper  sulphate  ~\ 
Ammonium  hydrate  J 
Sodium  sulphite  .  .  . 
Atnmonio-ferric  \ 
Calcium  hydrate  .  .  . 
Pine  shaving  with  \ 
hydrochloric  acid  j 
Stannous  chloride  ) 
and  hydrochloric  > 
No  ppt. 
Bluish-green  ppt, 
Ivight  yellow  ppt. 
Brownish  ppt. 
Yellowish  ppt. 
Dark  brown  ppt. 
Slight  ppt. 
Dark  brown  ppt. 
Yellowish-pink  color 
Bluish-green  ppt. 
(  No  red  color,  on  long 
<    standing  turning 
(  green. 
No  violet  color. 
No  change  in  color. 
No  ppt. 
Blue  color  and  ppt. 
White  ppt. 
Purple  ppt. 
White  ppt. 
Brown  ppt. 
No  ppt. 
Brown  ppt 
(  Very  slight  pink 
1  color. 
Blue  color  and  ppt. 
Ppt.  turning  blue. 
Slight  green  color. 
No  change  in  color. 
Yellow  ppt. 
Green  color  and  ppt. 
(  Vellow  color  with 
\    streaks  of  pink. 
Green  color  and  ppt. 
Ppt.  turning  pink. 
Violet  color. 
Pinkish  color. 
