586 
Rubus  Villosus. 
I  Am.  Jour.  Pharm. 
I    December,  1894. 
tin  and  alum.  After  standing  for  forty-eight  hours,  the  mucilage 
was  filtered  off  and  the  filtrate  evaporated  under  reduced  pressure 
to  dryness.  Again  attempts  were  made  to  "  puff  up  "  the  tannin, 
but  without  success. 
Obtained  by  this  means,  the  tannin  was  of  a  dark-brownish  color, 
had  a  faint  odor,  was  readily  soluble  in  water  and  in  alkaline  solu- 
tions, with  the  production  of  a  deep  reddish-brown  color  in  the  latter 
instance,  and  was  sparingly  soluble  in  ether,  sp.  gr.  -750  and  acetic 
ether  and  insoluble  in  acetone  and  benzol. 
A  one  per  cent,  aqueous  solution  of  the  tannin  reacted  as 
follows : 
Boiled  with  an  equal  volume  of  sulphuric  acid  (1-9),  after  twenty-four  hours 
standing,  a  slight  brownish  precipitate. 
Bromine  water,  yellow  precipitate. 
Ferric  chloride,  dark -greenish  color  ; 
and 
Ammonium  hydrate,  red-brown  color. 
Tartar  emetic,  no  change; 
and 
Ammonium  chloride,  faint  clouding  ;  after  twenty-four  hours  standing,  a  red- 
dish-brown precipitate. 
Copper  sulphate,  deep-brown  precipitate  with  a  greenish-yellow  supernatant 
liquid  ; 
and 
Ammonium  hydrate,  greenish-brown  color. 
Lead  nitrate,  brownish-yellow  precipitate. 
Calcium  hydrate,  darkening  of  color  ;  after  standing,  a  dirty  yellowish  solution 
with  a  greenish  fluorescence. 
Cobalt  acetate,  grayish-brown  precipitate. 
Manganese  acetate,  cloudiness  ;  on  standing,  a  slight  reddish  precipitate. 
Uranium  acetate,  brownish  precipitate. 
Ammoniacal  picric  acid  solution,  dirty-brownish  precipitate  ;   changing,  oh 
standing,  to  a  grayish-green. 
Potassium  bichromate,  deep-brown  color. 
Silver  nitrate,  reduced. 
Ferric  acetate,  red-brown  precipitate. 
Gelatin  and  alum,  precipitate. 
Fehling's  solution,  reduced. 
Some  of  the  preceding  tests  resemble  those  given  by  the  tannin 
of  hemlock,  while  others,  those  obtained  from  cutch  tannin,  as 
tabulated  in  Allen's  Commercial  Organic  Analysis,  Volume  III,  Part 
r,  pages  102-103.  ■ 
The  ether  with  which  the  aqueous  solution  of  the  tannin  was 
shaken,  previous  to  its  evaporation  to  dryness,  extracted  from  that 
