Am.  Jour  Pharm.  ) 
April,  1880,  J 
Albuminate  of  Iron, 
brown  only  in  the  centre,  the  margins,  upon  which  the  pressure  was 
evidently  not  so  strong,  being  opaque  and  light  brownish. 
5.  One  troyounce  of  egg-white  was  treated  precisely  as  in  Exp.  4, 
but  instead  of  precipitating  the  albuminate,  the  solution  was  evapo- 
rated to  dryness.  It  yielded  60  grains  (=i2"5  per  cent,  of  the  egg-white 
employed)  of  dry  substance  in  the  form  of  dirty  dark-brownish  scales, 
having  a  greenish  tinge,  and  when  powdered  had  a  light  brownish-grev 
color,  very  distinct  from  that  of  the  products  previously  obtained. 
6.  Experiments  4  and  5  having  convinced  me  that  the  quantity  of 
ferric  chloride  used  was  still  in  excess,  a  series  of  experiments  were 
made,  which  are  not  necessarily  given  in  detail,  but  which  consisted  in 
adding  variable  proportions  of  ferric  chloride  to  solution  of  egg-white, 
precipitating  the  solutions,  and  selecting  from  among  the  proportions 
so  determined  that  in  which  there  was  evidence  of  a  decided  but  small 
excess  of  ferric  chloride  in  the  filtrate.  This  was  found  to  be  50 
minims  of  liq.  ferri  chlor.,  U.  S.  P.,  to  4  troyounces  of  egg-white,  and 
operating  with  these  proportions  at  different  times,  the  following  yields 
of  albuminate  of  iron  were  obtained,  all  of  which  corresponded  in  their 
physical  characters,  solubilities,  etc.,  with  the  albuminate  obtained  by 
the  first  experiment  : 
4  troyounces  egg-white  yielded    214  grs.  =  11-23  P^r  cent,  albuminate. 
12        "  «  «       720    «   =  12-50       «  « 
22        "  "  «      1312    "  =  12-42       "  " 
With  the  above  proportions  the  filtrate  still  had  a  faint  yellow  color 
and  gave  a  decided  ferric  reaction,  but  only  a  faint  reaction  for  albu- 
men, while,  when  completely  washed  with  dilute  solution  of  salt,  the 
final  washings  failed  to  give  any  appreciable  evidence  of  either. 
Assuming  now,  for  the  purpose  of  comparison,  that  albuminate  of 
iron  is  a  definite  compound  in  which  i  molecule  of  ferric  chloride  (Fcg 
CI3)  is  united  with  i  molecule  of  albumen  (Cj^4Hj22Nj8S2044)/  the  fol- 
lowing table  will  show  the  relation  of  the  former  to  the  latter  in  the 
different  processes  that  have  been  suggested. 
^  A  normal  salt  would  require  2  molecules  Yt^.^  to  3  molecules  albumen. 
