422 



On Retardation of Chemical Action. 



Taking the value of b, or 1113-2, for the blank experiment 

 as equal to 100, and expressing the corresponding values of 

 this quantity contained in the above Table in terms of it, the 

 numbers contained in the following Table are obtained ; they, 

 in point of fact, represent the number of minutes required to 

 oxidize the iron in each solution from y' to y" ', the time 

 required to perforin the same amount of oxidation in the blank 

 experiment being 100 minutes, 



Table II. 



From the numbers contained in Table II., it will be seen 

 that the retardation in the rate of oxidation of ferrous sulphate 



