486 
Ferrated  AlhiLnmi. 
j  Am.  Jonr.  Pliarm^ 
{       Oct.,  1882. 
addition  of  hydrochloric  acid;  potassium  ferridcyanide  a  green  precipi- 
tate not  altered  by  hydrochloric  acid  ;  potassium  sulphocyanide  a  yel- 
lowish-brown precipitate,  the  solution  becoming  deep  red  on  the  addi- 
tion of  hydrochloric  acid ;  sodium  chloride  a  light  yellowish-brown 
precipitate. 
The  liquid,  evaporated  at  a  moderate  heat,  yielded  brown-red,  nearly 
tasteless  scales,  which  retained  their  solubility  in  water,  the  solution 
on  being  kept  for  a  year  becoming  slightly  mouldy,  but  not  putrid. 
The  scales  contained  Fe  1-1715,  CI  O'SIO,  albumen  97-775  =  Fefi\_ 
0-778,  excess  of  iron  as  Fe2(OH)6  2-765. 
It  is  obvious  from  the  foregoing  that  these  pfoducts  are  readily 
altered  and  cannot  be  of  uniform  composition  unless  obtained  under 
precisely  identical  conditions  of  temperature,  dilution,  action  of  water, 
etc.  It  is  remarkable  that  with  the  entrance  of  re2(0II)g  into  the 
compound  these  products  become  soluble  in  water  and  non-coagulable 
by  heat,  properties  which,  together  with  the  peculiar  behavior  to 
reagents,  are  best  observed  in  the  dialyzed  product,  and  result  from  a 
relatively  small  amount  of  iron.  The  difficulties  of  studying  the 
nature  of  such  products  are  increased  by  the  uncertainty  of  determin- 
ing the  water  without  altering  the  composition,  and  of  ascertaining 
whether  definite  compounds  or  mixtures  of  such  are  under  investi- 
gation. 
The  formation  of  iron-albuminates  may  be  used  for  proving  the- 
presence  of  albumen.  A  very  diluted  solution  of  albumen,  which  is 
scarcely  rendered  opalescent  by  boiling,  if  mixed  with  a  saturatal  solu- 
tion of  table  salt,  yields  on  the  addition  of  a  little  ferric  chloricte,  near 
the  point  of  contact  a  yellowish-white  zone,  and  on  agitation,  at  first  a 
dense  turbidity,  changing  after  a  while  to  a  rather  voluminous  pre- 
cipitate. 
On  digesting  iron  in  solution  of  albumen  for  a  few  days  a  yellowish- 
brown  liquid  is  obtained,  which  on  evaporation  at  a  moderate  heat 
yields  light-brownish  red  scales,  similar  in  behavior  to  the  dialyzed 
ferrated  albumen  ;  in  two  cases  1-2  and  2  per  cent,  of  iron  was  obtained. 
Freshly  precipitated  ferric  hydroxide  dissolves  in  albumen;  the  dry 
product  contained  0-65  Fe  =  1*24  Fe2(OII)g.  Ferrous  hydroxide  is 
very  slightly  soluble  in  albumen. — Archiv  d.  Pharmacie,  June,  1882,,, 
pp.  417-425.  J.  M.  M. 
