GOSSYPIUM  HERBACEUM. 
400 
Boracic  acid  no  change. 
Acetic  acid  precip.  bright  cherry. 
Tartaric  "       "        "         "      not  entirely. 
Citric     «       "        "         "  " 
Oxalic    "       "         "         "  " 
Potassa  precip.  dark  brown,  soluble  in  excess. 
Ammonia  slight  change  of  color  only, 
Carb.  potassa  precipitates  partially. 
Carb.  soda  no  precipitation,  very  little  change. 
Tart,  emetic  no  change. 
Acet.  lead  scarlet  precipitate. 
Proto  salt  iron  precip.  dingy  black. 
Per  salt  iron  precip.  brownish  red. 
Basic  acet.  iron  scarlet  ? 
Yellow  pruss.  potash  precip.  red,  partial. 
Corrosive  sublimate  precip.  red. 
Sul.  cinchonia  "       insoluble  in  acetic  acid. 
Lime  water  "       dirty  greenish. 
Chloride  of  calcium    "       without  change  of  color. 
Proto  salt  tin  "       dark  red. 
Sul.  copper  «       brownish  red. 
Basic  chlor.  iron        "  "  black. 
Litmus  sol.  is  reddened  ?  not  very  decisive. 
Per  acet.  iron,  cold  no  change;  hot  salmon  precipitate. 
The  tincture  diluted  to  any  extent  with  water  retained  its 
transparency.    This  diluted  solution  was  used  in  the  tests. 
These  tests  I  do  not  of  course  attach  any  particular  import- 
ance to.  I  give  them  simply  for  what  they  are  worth.  They 
will  serve  me  a  purpose  in  feeling  my  way  along. 
The  same  tests  were  applied  to  a  solution  similarly  obtained 
from  catechu,  with  results  agreeing  for  the  most  part,  but  widely 
differing  in  some  points. 
I  submit  specimens  of  dyes  obtained  from  the  cotton  root,  and 
also  from  catechu,  for  comparison.  The  samples  are  so  roughly 
executed,  I  forbear  any  comment  on  them  or  the  processes  by 
which  they  were  obtained,  except  only  to  remark  that  they  are 
very  permanent,  most  of  them  having  been  well  scrubbed  with 
soap. 
The  crude  material  was  subsequently  treated  with  water  acidu- 
