( 336 ) 



transition element proceerls at the temperature 2 is represented by 

 the equation 



E 



K= (1) 



where 2{iV) is the sum of the internal resistances (at T*^') of the 

 elements of which the transition element is composerlj and E the 

 electromotive force of the transition element at T^. 



I have shown ^) that the internal resistance of a CLAKK-cell at 

 2'° is proportional to that of the zinc sulphate solution, saturated 



at r«. 



Let the measured resistance of a saturated solution of 



Zn SO4 . 7 Hs = ^1 



and that of a saturated solution of Zn SO4, . 6 H3 at the same 

 temperature = W^. Then 



^ ( W)to = (p, W,)to + {p, W,)to , 



where pi and p^ are constants depending on the capacities of the 

 CLARK-cells used and of the vessels in which the resistances of the 

 saturated solutions were determined. 



If the same vessel is used for all the measurements, the equation 

 may be written 



^{W)r, = piW,+ W,) . 



If we call i2i and il^ the specific resistances of the saturated 

 solutions of Zn SO4 . 7 H3 and Zn SO^ . 6 Hs at TO and ü the 

 resistance-capacity of the vessel employed in measuring W^ and TFj, 

 then 



and K = 



Q, = y. W^ 

 E 



Or K^ ^ 



E 



il, + n. 



1) The paper reliitiug- to this will appear shortly in the Zeitschrift lür physikalische 

 Chemie. 



