loo         Liquor  Ferriy  Peroxy chloride  of  Iron,  etc.  { Am-MJa0ru;  x£7trm* 
sodium  carbonate  and  the  sodium  chloride  in  water,  the  filtrate  was 
acidulated  with  nitric  acid,  and  the  amount  of  chlorine  determined  with 
a  tenth  normal  solution  of  nitrate  of  silver  ;  the  ferric  oxide  was  cal- 
cined and  weighed. 
a.  Solution  of  precipitate  obtained  with  81*3  +  1  7  cc.  ammonia — "490  Fe2Cl3-f- 
•061  Cl=*44i  Fe203-f-*0953  Fe2Cl3— 82-6  per  cent.  Fe203-f- 1 7  4  per  cent.  Fe2Cl3. 
b.  Solution  of  precipitate  obtained  with  8i*3+three  times  i'j  cc.  ammonia — 
•365  Fe203-f-*o248  Cl=*346  Fe203-f-*o385  Fe2Cl3=9o  per  cent.  Fe203-fio  per  cent. 
Fe2Cl3. 
c.  Solution  of  precipitate  obtained  with  8i'3+four  times  1-7  cc.  ammonia — 
♦614  Fe203-r--o382  Cl=*5853  Fe203+'o583  Fe2Cl3=9i  percent.  Fe203-f9  per  cent. 
Fe2Cl3. 
d.  Solution  of  precipitate  obtained  with  8i'3-f-4*5  times  1*7  cc.  ammonia — 
•411  Fe203-|-  0223  Cl=*3942  Fe203+  034  Fe2Cl3=92  per  cent.  Fe203-f-8  per  cent. 
Fe2Cl3. 
e.  Solution  of  precipitate  obtained  by  adding  1  per  cent,  of  ferric  chloride  solu- 
tion to  the  precipitate  caused  by  89  cc  ammonia — '455  Fe203-f  0308  Cl=*43i8  Fe2Os 
+  •047  Fe2Cl3=9o-2  per  cent.  Fe203-f-9-8  per  cent.  Fe2Cl3. 
f.  A  precipitate  formed  by  adding  to  150  cc.  of  the  ferric  chloride  solution  91*5 
cc.  of  ammonia,  and  washed  until  the  filtrate  remained  perfectly  clear  on  addition 
of  silver  nitrate,  gave  on  analysis — '416  Fe203-f-  oo6o2  Cl=*4ii5  Fe203-f-oo9i7 
Fe2Cl3=97-83  per  cent.  Fe203-]-2,i7  per  cent.  Fe2Cl3. 
This  precipitate  was  transferred  to  a  bottle,  with  a  little  water,  and 
is  shaken  occasionally.  At  the  date  of  this  paper  it  has  stood  a  little 
over  seven  weeks,  during  which  time  over  three-fourths  of  the  original 
precipitate  has  dissolved.  The  writer  is  fully  convinced,  to  judge  from 
its  appearance,  that  it  will  ultimately  dissolve  entirely. 
g.  Another  precipitate,  obtained  with  a  little  more  ammonia  than  f  gave — '424 
Fe203  and  '00318  CI. 
This  precipitate  has,  at  the  date  of  this  paper,  not  shown  the  least 
sign  of  ever  dissolving,  although  it  has  stood  as  long  and  been  shaken  as 
often  as  f. 
For  comparison,  the  writer  has  examined  several  commercial  prepara- 
tions of  dialyzed  iron : 
I.  -604  Fe203-|-,o37i  Cl='576  Fe203-f--o57  Fe2Cl3=9i  per  cent.  Fe203-f"9  per 
cent.  Fe2Cl3. 
II.  -255  Fe2034--oi275  CI— 2454  Fe203+-oi947  Fe2Cl3=92-6  per  cent.  Fe2Os-f 
7-4  per  cent.Fe2Cl3. 
III.  -534  Fe203-r- -0203  Cl=  5187  Fe203+-o3i  Fe2Cl3=94-47  per  cent.  Fe2034- 
5*53  per  cent.  Fe2Cl3. 
