i88 
Albuminate  of  Iron, 
A.m.  Jour.  Pharm. 
April,  1880. 
and  92*7  grams  pure  albuminate  of  iron,  representing  4*8  grams  of 
ferric  oxide. 
Then,  if  927  grams  of  pure  albuminate  contain  4*8  grams  of  ferric 
oxide,  100  grams  of  pure  albuminate  contain  5*16  grams  =  5'i6  per 
cent.  FegOg. 
The  experiment  showed  that  the  product  obtained  by  the  process  of 
precipitation  contains  a  considerable  proportion  of  chloride  of  sodium. 
-Remembering  that  the  expressed  precipitate  was  translucent  in  the 
centre  and  opaque  in  the  margin,  a  portion  of  the  clear  central  mass  of 
the  press  cake  obtained  by  Exp.  6  was  dried  and  treated  precisely  as 
the  above.    The  result  was  as  follows  : 
H'o  gram  clear  albuminate,  Exp.  6,  yielded,  .  .    0*105  gram  ash 
Ash  yielded,        .....  0*056     "  salt 
Difference,        .....     0*049     "  ^^^2^3 
100  grams  of  this  albuminate,  therefore,  contains  only  5'6  grams  of 
salt,  and  the  pure  albuminate  of  iron,  constituting  the  remainder,  = 
5*19  per  cent.  Fe203. 
Equal  portions  of  the  three  lots  of  albuminate  of  iron  obtained 
according  to  Exp.  6  were  now  powdered  together,  and  i  gram  of  this 
powder  treated  as  above.    The  result  now  was  as  follows : 
I  o  gram  mixed  albuminate,  Exp.  6,  yielded,  .  .    0*120  gram  ash 
Ash  yielded,         .....  0*072      "  salt 
Difference,        .....    0048     "  Fe.Oy 
Showing  that  100  grams  contained  7*2  grams  of  salt,  and  that  the 
pure  albuminate  contained  5*17  per  cent.  Fe203. 
It  remained  now  to  subject  the  albuminates  of  iron  obtained  by 
Friese's  (Exp.  7)  and  Bernbeck's  (Exp.  8)  methods  to  similar  quantita- 
tive examination.  But,  inasmuch  as  the  peculiar  method  by  which 
these  albuminates  were  obtained  seemed  to  exclude  the  presence  of 
saline  components  other  than  ferric  compounds,  these  were  simply 
incinerated,  and  the  residue  weighed  as  ferric  oxide. 
I  gram  albuminate,  Exp  7,  yielded  0  048  gram  =  4*8  per  cent.  FejOg 
I  gram  albuminate,  Exp.  8,  yielded  0*048  garm  =  4*8  per  cent.  FegOg 
thus  pointing  to  identity  in  their  composition,  notwithstanding  that  the 
one  was  obtained  with  normal  solution  of  ferric  chloride,  and  the  other 
with  ferric  chloride  which  had  been  previously  deprived  of  its  excess 
of  acid. 
