74 
Arnrnonio-  Citrate  of  Iron. 
f  Am.  Jour.  Phaem. 
t     Feb.  1, 1874. 
8  fl.  oz. 
4  oz.  (Avoir. 
19J  fl.  oz. 
British  Pharmacopoeia,  1867. 
Solution  of  Persulphate  of  Iron  (1-441) 
Citric  Acid,  .... 
Sol.  Ammonia,  (-959) 
United  States  Pharmacopoeia,  1873. 
Citric  Acid,         .  .  .  5  oz.  360  grains  (Troy). 
Sol.  Persulphate  of  Iron  (1-320)  .  16  fl.  oz. 
Sol.  Ammonia,    .  (-960)     .  20  fl.  oz. 
French  Codex,  1866. 
Acid  Citric,  ..... 
Hydrated  Peroxide  of  Iron, 
Sol.  Ammonia,  .  .  .  .  . 
Add  such  a  quantity  of  hydrated  ferric  oxide  as  will  correspond  to 
53  parts  of  anhydrous  oxide  iron. 
Pharmacopoeia  Germanica,  1872. 
Citric  Acid,  .  .  .         .  .8  parts. 
Oxide  of  Iron,     .  .  .  .  q.  s. 
Then  add  Citric  Acid,  .  .  .1  part. 
Sol.  Ammon.       .  .  .  .  q.  s.  to  saturation. 
The  following  table,  deduced  from  these  formulae,  will  show  at  a 
glance  the  relative  amounts  of  anhydrous  ferric  oxide  to  the  same 
amount  of  citric  acid  : — 
100  parts, 
q.  s. 
18  parts. 
Lond.  Pharm., 
Brit.  Pharm., 
u 
U.  S.  Pharm., 
French  Codex 
Pharm.  Ger., 
1851 
1864 
1871 
1873 
1872 
Citric  Acid.  Ferric  Oxide 
100  parts. 
57-3 
33-4 
41-8 
40-0 
53-0 
? 
Added  as  ferrous  salt. 
Added  as  ferric  salt. 
The  London  and  British  Pharmacopoeias  describe  the  amount  of 
ferric  oxide  resulting  from  incineration  with  free  exposure  to  air,  but 
the  Codex  and  German  and  American  Pharmacopoeias  do  not  state 
the  amount  of  ferric  oxide  perfect  specimens  of  their  respective  salts 
should  contain. 
