XeSeV^iT'}  Preservation  of  Hydrogen  Peroxide.  543 
Age  at  time  of  test. 
2  months  6  months 
K2S04  f-  acetanilide  22.70  22.2s 
5000  ■  0 
MgS04^-  15.80....   6.80 
5  5000 
MgS04        +  acetanilide  22 . 70  22.35 
CaS04—  12.80   3.90 
5000 
CaS04  h  acetanilide  22.70  22.40 
5000  '  ^ 
ZnS04—  16. 1    7.55 
5000 
ZnS04  h  acetanalide  22.6s  22.25 
5000  00 
CuS04  1   •'  ••  100 
50,000 
CuS04  -  h  acetanilide  .....22. 60  21.75 
50,000  ' 0 
Series  VI :  Solutions        Normal  in  H3P04.  Effect  of  Various 
Salts  alone  and  with  Acetanilide. 
The  same  procedure  was  followed  as  with  Series  IV  including  the 
neutralization  of  Na2SiOs  with  H3P04.  At  the  beginning  1  c.c. 
of  the  solutions  required  23.65  c.c.  n/io  thiosulphate. 
Age  at  time  of  test 
2  months  6  months 
Original  solution  17 . 85  10 . 60 
Original  solution  +  acetanilide  23 . 35  22 . 90 
Na2HP04^-  17.80  10.55 
5000 
Na2HP04         +  acetanilide  23 . 40  23.25 
CaCl2^—  20°5  i5-oo 
-5000 
CaCl2  ■  h  acetanilide   23 . 20  22 . 9 
5000 
Na2Si03—  18.40......  11.50 
3000 
Na2Si03  —  h  acetanilide  23 . 40  22 . 95 
3000 
AkGSO^jjOOOO  +  acetanilide  23 . 40  23 . 05 
PbCQiHsO,):.— ^—  J9-75  13-90 
50,000 
Pb(C2H302)2  —  1-  acetanilide  23 . 45  23 . 15 
50,000 
