314 
REVIEW  OF  PHARMACOPOEA  HELVETICA. 
Ferrum  aceticura  is  an  excellent  preparation,  being  the  dry 
salt  in  a  state  perfectly  soluble  in  water  and  alcohol.  Peroxide 
of  iron,  freshly  precipitated  by  ammonia,  is  washed  with  cold 
water,  digested  in  acetic  acid  for  6  hours  at  40  to  60°  C;  after 
standing  over  night  the  clear  solution  is  decanted,  not  filtered, 
and  evaporated  at  between  60  and  80°  C.  It  contains  about 
half  its  weight  of  oxide  of  iron. 
Ferrum  carbonicum  is  a  wrong  name  for  the  preparation  offici- 
nal here  as  Ferri  subcarbonas,  a  name  not  much  more  appro- 
priate. 
Ferrum  carbonicum  saccharatum,  prepared  by  drying  the 
protocarbonate  obtained  from  12  p.  sulphate  of  iron,  with  5  p. 
sugar,  contains  about  one-fourth  its  weight  of  iron,  and  is  a  very 
appropriate  compound. 
Ferrum  jodatum  contains  about  double  the  amount  of  iodine  as 
the  same  measure  of  our  syrupus  ferri  iodidi,  but  is  free  from 
sugar  and  therefore  unstable. 
Ferrum  jodatum  saccharatum  is  the  dry  salt  preserved  by 
sugar  of  milk,  in  the  proportion  of  5  parts  to  one  of  iodine. 
The  Pharmacopoeia  orders  also  proto-  and  sesquichloride  of 
iron  in  crystals,  ammonio-citrate,  lactate,  peroxide,  proto-per- 
oxide,  phosphate  (blue),  powder  obtained  mechanically  and  by 
hydrogen,  and  sulphate  of  iron. 
Glycerinum  has  only  a  specific  gravity  of  1*227  to  1-230;  a 
pale  yellowish  article,  otherwise  pure,  is  allowed. 
Corrosive  sublimate,  calomel  (prepared  by  subliming  the  former 
with  mercury),  white  precipitate,  iodide  and  biniodide,  oxide  and 
black  sulphuret  of  mercury,  correspond  with  our  preparations. 
Protonitrate  of  mercury  in  crystals  and  solution,  and  Hahne- 
mann's soluble  mercury  are  likewise  officinal,  the  latter  under 
the  incorrect  name  of  hydrargyrum  oxydulatum  nigrum. 
Hydrargyrum  depuratum  is  made  by  digesting  mercury  with 
solution  of  sesquichloride  of  iron  and  washing  with  water. 
Hydrargyrum  sulfurato-stibiatum  s.  JEthiops  antimonialis 
consists  of  equal  parts  of  the  black  sulphurets  of  mercury  and 
antimony. 
The  preparations  of  potassium  agree  with  those  of  our  phar- 
macopoeia, except  that  a  pure  carbonate  is  not  ordered,  but 
