--f{^) 



328 



TABLE 7. 



Magnetite Electrode (saturated) Griesheim. 



TABLE 8. 

 ^ = (f{f) ;. = 589/-'/^ Magnetite Electrode (saturated) Griesheim. 



chemical symbol is in accordance with the theoiy of Hilpert which 

 supposes that in the case of magnetic iron oxide the basic and acid 

 properties are united in one and the same molecule. It is, however, 

 conceivable that the very slight activity of the acid radical may 

 be due to an admixture of foreign basic oxide in the mineral. 



