758 



1 — me 



ÖC = ÖQ . 



ino 



(28) 



Now we get from (27), keeping in view that i^ remains unchanged: 



Making use of (19), (21), and (28) we get from this, when we 

 apply the thesis of the free energy : 



ƒ 



'p 1 — wu' dip ^ ^^ 

 ^ + ip + -^-2,t5=.x 



. do . dt =z 



Further exists the relation : 



Q . dt =■ M, 

 the total mass, from which follows : 



ÖQ . dt ■=■ 0. 



The formula 



h f 



ƒ 



L -\-xp-\- — — — . -^ — 2.t5' . X = const. 



(29) 



follows from the two lelations as condition of equilibrium for the 

 solution in the magnetic field. For this we may put, just as above 

 in the expressions (22) 



o ni in 



2.tB^ ./ == const., 



from which follows, because at the anode B = 0, at the cathode B^=H, 

 just as above for (24) : 



7?T c — 



— log^-RT {c-c,) = 27r'i.H^^). 

 in c. 



(30) 



When w^e introduce this into (25), we get for the potential differ- 

 ence in the state of equilibrium, at which also the solution is in 

 equilibrium 



i^J(/-^)^5 (31) 



E 



6. In order to test the obtained result by observation, I made a 

 number of experiments, in the first ])lace with iron. The iron 

 used for this was electrolytic iron, which Prof. Franz Fischer at 



1) With neglect of the contraction which the solution undergoes, this result is 

 in accordance with the result derived by Voigt (Gött. Nachr. Math. phys. KK 

 1910 p. 545), 



