3 o 



O . t- 



rH CO r* 



S S S 8 



Peroxid m 

 averag 



s s 



First precipita 

 tion. 





ill 



O o ft 



S3 3S S-g' S3 8 38 S 5! 

 SS SS So SS SS 8 Si 



O <^ 



5>S 38 88 co8 88 S SS 32 S8 8* 8w S ! 

 SS SS SS SS SS 8 SS SS SS SS SS 8 Si 



i 



1 < 





iCiC OO OCC OO t-< 



OO OO OO OO O c 

 ^^ rH^ ^^ ^^ rH , 



O o ft 



8 co 3 f5 3 8 



So oo SS So 



Percent 

 of sul- 

 phur. 



o 





SS SS SS S3 SS 



o 



SS SS SS SS SS o SS 











X 0> 



1 1 



o p w 



[Cir. 56] 



