"^"^Xis^Bo^"'}  Albuminate  of  Iron,  i8i 
2.  Aibumen  is  precipitated  from  its  aqueous  solutions  by  dilute  sul- 
phuric, nitric,  hydrochloric  and  pyro-  and  meta-phosphoric  acids  ;  but 
4)y  the  ordinary  tribasic  phosphoric  acid,  or  by  organic  acids,  only  upon 
the  addition  of  chloride  or  sulphate  of  sodium,  or  other  alkali  salts. 
3.  Albumen  appears  to  form  acid  and  normal  salts,  the  first  contain- 
'^ing  one  molecule  of  base,  the  second  two  molecules.  It  also  appears 
to  combine  directly  with  some  salts — principally  basic — in  the  same 
(.proportions . 
4.  The  acid  salts  of  albumen  are  sometimes  soluble,  the  normal  salts 
generally  insoluble  in  water ;  but  neither  are  insoluble  in  excess  of 
metallic  salt  or  albumen. 
5.  The  formula  for  albumen  is,  according  to  Lieverhuhn,  Cj^^Hj22 
^13^2^4/?  so  generally  accepted.  That  of  its  acid  salts  would 
be  represented  by  the  formula  MO,Cj4^Hi22N^3S204^ ,  and  that  of  its 
normal  salts  by  2lVIO,Ci4^Hi22NigS2044. 
It  becomes  evident,  from  the  above,  that  my  inquiries  gave  no  clue 
ito  a  precipitate  for  albuminate  of  iron,  and  it  was  therefore  by  a  purely 
empirical  process  of  reasoning  that  I  decided  to  try  the  effect  of  a  satu- 
rated solution  of  common  salt  upon  a  quantity  of  Donitz's  solution  of 
albuminate  of  iron,  to  which  an  excess  of  ferric  chloride  had  been  pre- 
viously added.  The  result  was  an  immediate,  copious  and  evidently 
^complete  precipitate,  which  my  experiments  seem  to  prove  to  be  an 
albuminate  of  definite  composition,  and  which  is  obtainable  from  solu- 
tions containing  an  excess  of  albumen  as  well  as  from  such  that  con- 
tain an  excess  of  ferric  chloride.  The  following  is  a  brief  account  of 
kthe  experiments  made  : 
I.  To  a  quantity  of  Donitz's  solution  corresponding  to  one  egg- 
-white, one  fluidrachm  liq.  ferri  chlor.,  U.  S.  P.,  diluted  with  water  and 
partly  neutralized  with  ammonia,  was  added,  whereby  no  other  change 
than  a  slight  deepening  in  color  was  produced.  On  now  adding  a 
■quantity  of  saturated  solution  of  chloride  of  sodium  (hereafter  desig- 
nated as  "  solution  of  salt  "j,  a  copious,  light  brown  precipitate  was 
produced,  while  the  supernatant  fluid  had  a  decided  yellow  color,  gave 
abundant  evidence  of  iron,  and  only  faint  evidence  of  albumen.  The 
4)recipitate  was  collected,  expressed,  shaken  with  distilled  water,  in 
which  it  dissolved  completely,  and  again  precipitated  with  solution  of 
rsalt.    The  filtrate  now  passed  colorless,  and  gave  only  faint  evidence 
The  old  notation  is  retained  in  this  paper. 
