091 



tromotive behaviour of iron with respect to solutions containing a 

 varying ferro- and ferri-ion content, as appears from the following 

 table. 



ferrosalt 



Fe-electrode in solutions with varying ratio 



ferrisalt" 



As was said in ti.'e inti-odnction, tlie complexity must first be 

 proved, and then we may try and decide whether the ions differ 

 in valence. 



The theory of allotropy already considered (he anodic polarisation 

 phenomenon of iron a cleai' experimental j>roof, and now the attack 

 experiments have furnished in our opinion (he first irrefutable proof. 

 And now that this stage is reached the elecdomotive behaviour 

 of iron with respect to solutions with varying ferro- and ferri-ion 

 content appears in a new light. 



Now that we namely know that iron must contain different metal 



ions, it was natural to try it 

 the observed phenomena ma}" 

 be accounted for from the new 

 point of view on the assump- 

 tion that iron contains ions of 

 different valence. And really, 

 for so far as we can now sur- 

 vey the region of the observa- 

 tions, this attempt is entirely 

 successful. 



If we construct a h,.v tigure 

 for the system Fe-electrolyte in 

 the way as was already indi- 

 cated by one of us, the con- 

 nection between the pseudo-bi- 

 nary and the unary system 

 drawn in fig. '1 harmonizes well 

 ■^ wi(h the experimental facts. 



The stable unary electromotive two-phase equilibrium is indicated 



