484 
Ferrated  Albumen. 
f  Am.  Jour.  Pharni_ 
\      Oct.,  1882 
required  was  noted.  From  this  the  percentage  of  chloride  was  calcu- 
lated in  the  following  way. 
For  example,  1  gram  of  the  bromide  was  used.  According  to  their 
combining  powers,  1  gram  of  potassium  bromide,  if  perfectly  pure, 
would  require  for  complete  precipitation  84'03  cubic  centimeters  of  the 
argentic  nitrate  solution.  1  gram  of  potassium  chloride,  if  perfectly 
pure,  would  require  for  complete  precipitation  134"22  cubic  centimeters 
of  the  argentic  nitrate  solution.  The  difference  between  the  volume  of 
silver  solution  required  for  the  two  salts  would  then  be  134*22 — 
84-03=-50-19;  and  since  50-19-^100=-50l9  it  follows  that  for  each 
•5019  cubic  centimeters  of  the  silver  solution  used,  above  the  amount 
required  for  pure  bromide,  1  per  cent,  of  chloride  is  indicated.  The 
sample  containing  carbonate  was  previously  neutralized  by  nitric  acid. 
The  amount  of  potassium  chloride  present  was  determined  to  be 
1-10,  1-39,  1-55,  1-97,  2-24,  2-25,  3-44,  4*88,  5*98  and  6*92  per  cent.,, 
or  for  the  ten  samples  an  average  of  3' 17  per  cent. 
FEEKATED  ALBUMEN. 
By  George  Buchner,  of  Munich. 
From  the  author's  investigations  and  observations  on  compounds  of 
ferric  chloride  with  albumen  we  make  the  following  abstracts : 
The  amount  of  chloride  in  egg-albumen  was  determined  by  ignition 
with  sodium  carbonate  and  titration  with  nitrate  of  silver; -1*6  per 
cent.  CI  was  found.  The  chlorine  of  the  compound  was  determined 
in  the  same  manner,  deducting  the  chlorine  of  the  albumen.  The  iron 
was  estimated  by  ignition,  dissolving  in  hydrochloric  acid,  reduction  to 
ferrous  salt  by  zinc,  and  titration  by  potassium  permanganate. 
1.  Solution  of  ferric  chloride  (1:20)  was  added  to  a  filtered  solution 
of  albumen  (1:10)  until  the  voluminous  yellowish-brown  precipitate  was 
just  dissolved.  In  the  clear  red-brown  liquid  albumen  as  well  as 
ferric  chloride  responded  to  the  usual  reagents.  On  evaporating  this 
liquid  at  a  temperature  not  exceeding  50°C.  and  drying  the  gelatinous 
mass  at  the  same  temperature,  a  dark-brown  powder  or  transparent 
brown-red  scales  were  obtained,  only  partly  soluble  in  water,  the  insolu- 
ble portion  becoming  transparent  and  gelatinous.  Analysis  :  Fe  2*  1  93^ 
CI  7-980,  albumen  89*827  =  Fe^Clg  6*354,  excess  of  CI  3*819. 
2.  The  preceding  product  was  thoroughly  washed  with  water  and 
