^%{Z,mo^''''}  Preparations  of  White  ^ebracho  Bark,  93, 
and  can  be  used  for  the  same  purposes,  pharmaceutically,  as  an  anti- 
septic alone  or  mixed  with  wood  charcoal,  or  as  an  ingredient  in  denti- 
frice powders,  electuaries,  etc. 
lufmion. — The  infusion  is  similar  to  sherry  in  color,  clear  and  trans- 
parent. It  has  a  bitter  taste,  analogous  in  every  respect  to  that  of  an 
infusion  of  cinchona,  but  more  pronounced.  It  is  prepared  with  the 
same  proportions  as  the  decoction. 
Decoction, — Quebracho  bark,  bruised,  i  part  ;  water,  20  parts.  Dr,. 
Mantegazza  prepares  it  in  the  proportions  of  i  to  12  or  18.  The 
decoction  is  more  intense  in  color  than  the  infusion,  and  if  it  be  con-, 
centrated  so  as  to  reduce  it  to  one-third  it  acquires  a  color  as  deep  as 
that  of  port  wine.  It  remains  clear  whilst  kept  at  an  elevated  tem- 
perature, but  as  it  cools  it  deposits  an  abundant  precipitate.  A  few- 
drops  of  sulphuric  acid  restore  partially  its  transparency  by  dissolving 
the  alkaloid  it  contains.  If  added  to  a  solution  of  sulphate  of  iron  at 
very  large  quantity  of  greenish-grey  precipitate  is  produced.  With 
ammonia  it  undergoes  no  alteration. 
The  decoction  is  used  as  a  tonic  and  febrifuge  and  it  is  the  form  in 
which  quebracho  is  administered  in  the  provinces  where  paludal  fevers 
prevail. 
Digestion. — Made  with  sulphuric  or  acetic  acid  in  the  proportions 
indicated  for  the  preparation  of  the  alkaloid  according  to  Fraude's 
method.  At  the  end  of  four  to  six  days  it  is  as  intense  in  color  as  the 
concentrated  decoction  and  has  a  much  more  bitter  taste,  as  it  contains 
much  alkaloid  in  solution. 
It  can  also  be  prepared  for  internal  use  with  a  smaller  quantity  of 
sulphuric  acid. 
Tincture. — Quebracho  bark,  bruised,  i  part  j  alcohol,  56°,  5  parts. 
Macerate  during  eight  days  and  filter.  (This  formula  corresponds  to 
the  tincture  of  cinchona  of  the  Codex). 
Compound  Tincture. — Quebracho  bark,  bruised,  2  parts  \  orange  peel, 
I  part  5  alcohol,  56°,  15  parts. 
Wine. — Quebracho  bark,  bruised,  i  part  j  alcohol,  56°,  2  parts; 
white  wine,  San  Juan  or  Mendoza,  16  parts.  Leave  the  alcohol  in 
contact  with  the  bark  during  twenty-four  hours,  then  add  the  wine, 
macerate  for  eight  days  and  filter.  The  use  of  one  or  other  of  these 
wines  is  recommended  because  they  contain  little  tannin  and  possess  a 
special  aroma  that  communicates  an  agreeable  flavor  to  the  preparation. 
