i82 
Albuminate  of  Iron. 
f  Am.  Jour.  Pharm^ 
t      April,  1880. 
of  iron  and  of  albumen.  The  strongly  expressed  precipitate  constituted 
a  translucent  mass,  light  brown  in  thin,  dark  reddish-brown  in  thiclc 
layers,  very  friable  when  dry,  and  then  easily  reduced  to  a  very  fine- 
powder  having  a  light  cinnamon-brown  color.  It  was  readily  soluble- 
in  water.    Its  quantitv  was  not  determined. 
2.  A  quantity  of  Dtinitz's  solution  corresponding  to  one  egg-white 
(one  ounce,  more  or  less)  yielded,  upon  evaporation  in  a  current  of 
warm  air,  56  grains  of  albuminate  of  iron  in  the  form  of  friable,  light 
yellowish-brown,  translucent  scales,  which  produced  a  very  light  cin- 
namon-brown powder. 
3.  A  portion  of  the  same  solution,  corresponding  to  the  same  quan- 
tity of  egg-white,  was  treated  with  one-third  its  volume  of  solution  of 
salt,  the  precipitate  collected,  washed  with  a  mixture  of  one  volume  of 
solution  of  salt  and  three  volumes  of  distilled  water  (hereafter  desig- 
nated "  dilute  solution  of  salt "),  subjected  to  powerful  expression  andj 
dried.  It  weighed  34'grains  and  possessed  all  the  characters  of  the- 
albuminate  of  iron  obtained  by  Exp.  i.  The  filtrate  from  the  precipi- 
tate, however,  gave  but  faint  evidence  of  iron  and  abundant  evidence 
of  albumen,  the  washing  being  continued  as  long  as  decided  evidence 
of  the  latter  was  given.  Both  the  filtrate  and  washings  appeared  color- 
less. 
From  these  experiments  it  became  evident  that,  while  in  Exp.  i 
very  decided  excess  of  ferric  chloride  had  been  used,  in  Exp.  2  and  3 
albumen  was  in  excess.  This  excess  of  albumen  is  represented  in  the 
dry  albuminate  obtained  by  Exp.  2,  but  is  removed  by  washing  in  Exp. 
3,  just  as  the  excess  of  ferric  chloride  is  removed  by  washing  in  Exp... 
I.  The  quantity  of  ferric  chloride  employed  in  Exp.  i  was  therefore- 
reduced,  some  attempt  being  also  made  to  establish  a  working  formula. 
4.  10  troyounces  of  egg-white  were  diluted  to  20  fluidounces  witb> 
distilled  water,  a  solution  of  3  fluidrachms  of  liq.  ferri  chlor.,  U.  S.  P.^ 
in  10  fluidounces  of  distilled  water  was  added,  and  the  solution  filtered.. 
10  fluidounces  of  solution  of  salt  were  now  added,  the  precipitate  col^- 
lected  on  wetted  muslin,  washed  with  dilute  solution  of  salt,  drained,, 
expressed  powerfully,  and  dried.  The  product  weighed  9  drachms  (= 
1 1*25  per  cent,  of  the  egg-white  employed)  and  had  all  the  characters  of 
the  albuminate  obtained  by  Exp.  i.  The  filtrate  was  yellow,  thougb 
much  lighter  than  that  obtained  by  Exp.  i  ;  the  washings  finally  gave 
evidence  only  of  traces  of  iron  and  of  albumen.  The  press  cake„ 
though  obtained  by  powerful  pressure,  was  translucerut  dark  reddish- 
