AmAugusi,Ii895!m*}        Solution  of  Potassium  Arsemte.  403 
vent  recovered.  The  residue  was  treated  with  distilled  water  and 
the  solution  filtered.  In  order  to  further  purify  the  product  of 
the  action  of  the  fused  alkali,  it  was  removed  from  the  last  solu- 
tion by  agitation  with  ether,  as  before.  The  residue  left  upon 
the  evaporation  of  the  ether  was  dissolved  in  water,  and  in  this 
solution  the  following  reagents  indicated  the  presence  of  proto- 
catechuic  acid. 
Ferric  chloride,  green  color,  slight  ppt., 
and 
Sodium  carbonate,  red  color. 
Ferrous  sulphate,  in  neutral  solution,  purple  color  and  ppt. 
Lead  acetate,  yellow  ppt. ;  filtrate  gave  a  slight  ppt.  with  lead  oxyacetate. 
Ammoniacal  silver  nitrate,  reduced. 
Fehliug's  solution,  reduced. 
Lead  oxyacetate,  yellow  ppt. 
Pine  wood  and  •) 
Hydrochloric  acid,  }No  violet  or  red  color  (absence  of  phloroglucol). 
The  inference  the  author  draws  from  this  investigation  is  that  the 
tannin  principle  of  Cinnamomum  Cassia  is  either  a  phlobaphene  as 
it  exists  in  the  drug,  or  that  it  acquires  a  phlobaphene  character 
when  brought  into  contact  with  water.  In  either  case,  the  presence 
of  such  compounds  could  be  expected  to  contribute  a  large  part  of 
the  difficulty  experienced  in  percolating  the  drug  with  aqueous 
menstrua. 
A  NEW  PROCESS  FOR  THE  PREPARATION  OF  SOLU- 
TION OF  POTASSIUM  ARSENITE,  U.  S.  P. 
By  Andrew  Campbell,  Ph.G. 
Contribution  from  the  Chemical  Laboratory  of  the  Philadelphia  College  of 
Pharmacy.    No.  146. 
With  the  object  of  practically  ascertaining  the  value  of  a  sugges- 
tion of  Garraud,  in  the  Bulletin  de  la  Societe  de  Pharmacie  de  Bor- 
deaux, in  regard  to  a  rapid  method  for  the  preparation  of  Fowler's 
solution,  the  experiments  described  below  were  undertaken  by  the 
author. 
But  before  taking  up  the  consideration  of  the  proposed  method, 
it  might  be  well  to  review  the  methods  which  have  been  so  long  in 
vogue,  so  that  their  features  will  be  fresh  in  mind. 
The  official  method  of  the  United  States  Pharmacopoeia  of  1890 
for  the  preparation  of  solution  of  potassium  arsenite,  is  to  boil  10 
