INTRODUCTION  OF  THE  CINCHONA  INTO  INDIA. 
429 
process  must  be  repeated  from  four  to  six  times,  with  constant 
stirring,  so  as  to  exhaust  them  as  much  as  possible.  The  decoc- 
tions are  poured  off  each  time,  without  straining  ;  the  fluids,  to 
which  the  residue  is  finally  added,  are  collected  in  a  beaker,  but 
the  determination  of  the  tannin  must  not  be  proceeded  with  un- 
til they  are  cold.  In  dropping  in  the  cold  solution  of  gelatin, 
a  small  rod  must  be  employed  to  prevent  it  from  flowing  out  in 
a  stream,  by  which,  especially  towards  the  close  of  the  experi- 
ment, the  precipitation  might  easily  be  exceeded.  It  is  also 
well  to  allow  the  exhausted  residue  to  remain  in  the  fluid,  as  it 
assists  greatly  in  the  rapid  separation  of  the  tannate  of  gela- 
tin. 
The  determinations  effected  by  the  author  in  the  way  above 
described  gave  the  following  results  : — 
Grains  of  Tannin. 
100  grs.  of  young  oak  bark,        .        .        .        13|  1 
"    "    of  oak  bark  from  a  tree  100  years  old    .  81A 
"    «    Eschurg  oak-bark  .        .        .  1911 
"    "    Pine-bark  from  young  stems        .        .  122.-8. 
"    "    of  native  galls       ....  50-1 
"    "    of  Divi  divi  ....  49^ 
"    "    of  Sumach  ....  1911 
«    «    of  Tormentilla  root    ....  3314 
"    "    of  American  bark  (the  so-called  Mimosa- 
bark,  probably  belonging  to  a  cinchon- 
aceous  plant)        ....  31g5T 
"    "    of  best  gall-nuts  .        .        .  77l| 
"    "    of  Chinese  galls  (from  Rhus  semi-alatum)  65|| 
Chem.  Gaz.  from  Eisner's  Techniseh-cliemische  Mittheilungen 
fur  1857-1858,  p.  45;  Polytechn.  Oentralblatt,  1859,  p.  56. 
INTRODUCTION  OF  CINCHONA  INTO  INDIA, 
We  have  great  satisfaction  in  stating  that  steps  have  been 
taken  for  the  realization  of  this  important  project,  for  we 
understand  that  Mr.  Clement  Markham  has  been  appointed  by 
the  Government  to  proceed  to  the  Cinchona  districts  of  South 
America  for  the  purpose  of  obtaining  seeds  and  plants  of  some 
of  the  more  valuable  species  of  Cinchona,  and  of  transporting 
