Am.  Jour.  Pua-rm, 
June  1,  1871. 
}    Elixir  Cinchonce  et  Ferri  Ghloridi.  245 
to  the  tow,  and  the  surface  of  the  powders  is  covered.  Cork  the 
percolator  mouth,  and  allow  to  macerate  for  forty-eight  hours.  Now 
remove  the  cork  and  pour  on  dil.  alcohol,  and  as  fast  as  the  tincture 
comes  off,  dissolve  in  each  pint  one  pound  avoirdupois  of  powdered 
sugar,  until  (Oxvj)  sixteen  pints  are  obtained  of  the  elixir,  and  mix. 
Sol.  Ferri  Chloridi  (Proto-)  (FeOl). 
R.    Sulphatis  Ferr.  (FeO,  SO3,  7H0)  av.  oz.  iv, 
Sacch.  Alb.,  av.  oz.  vj, 
Aq.  Bull.  Oj. 
Solve  and  filter  whilst  hot  as  rapidly  as  possible. 
R.    Sodse  Carb.  Purae  Cryst.  av.  oz.  v,  vel  q.  s. 
Aq.  Bull.,  f5viij. 
Solve,  and  filter  while  hot. 
Mix  the  two  solutions,  pour  the  precipitated  proto-carbonate  of  iron 
upon  a  calico  filter,  and  wash  thoroughly  with  boiling  water,  with  an 
ounce  of  syr.  simpl.  to  the  pint,  until  the  precipitate  is  free  of  soda. 
Dissolve  the  oxide  in  pure  hydrochloric  acid,  being  careful  not  to  use 
an  excess.  Then  add  syr.  simplex  to  make  the  solution  measure 
twenty-two  (f^xxij)  fluidounces. 
Now  take  Elixir  Cinchonas,  Cong,  j, 
Ac.  Hydrochloric.  Pur.,  ^j,  (troy  weight), 
Alcohol.,  f^iv. 
M.  by  agitation,  and  then  add 
Sol.  Ferri  (Proto)  Chloridi,  f^ij. 
M,    Dose  for  adult  3ij  to  ^iv,  in  water. 
It  has  been  my  experience,  Avhen  the  chloride  of  iron  is  made 
directly/  from  iron  and  muriatic  acid,  notwithstanding  I  used  every 
precaution  in  selecting  material  and  mode  of  preparation,  it  has 
blackened  the  elixir,  either  at  once  or  in  a  short  time  afterwards.  I 
have  made  the  protochloride  by  various  processes :  double  decompo- 
sition between  FeO,  SO3,  7H0,  and  BaCl,  which  makes  a  very  beau- 
tiful solution  under  proper  precautions,  and  keeps  well.  Where  con- 
siderable quantities  are  to  be  made,  the  precipitation,  washing  and 
solution  I  perform  in  vessels  exhausted  of  air  and  filled  with  hydro- 
gen. The  formula  I  sent  you  I  used  for  years,  until  I  have  required 
larger  lots,  when  I  constructed  an  apparatus  for  the  purpose.  I  have 
directed  boilifig  water  for  the  reason  it  is  deprived  of  air,  (and  conse- 
