Z)'2$ Prof. H. F. Weber's Researches on 



therefore 



-A-2 == xi^^ Ag= . . . = U. 



Consequently the general solution, fulfilling all the conditions, 

 of the present problem is 



I/i / IA 



,_ __IA L 4 IA T f -S«. 1 -£» 



*~*° kq'2 + TT*Yq 



From this we get for the concentrations z" and z' (present in 

 the boundary layers for x = L and #= respectively) the values 



, 4 k r -Si*. i -fin. r 



+ ?*j L u L + r L + -j> 



and the electromotive force E, present at the instant t between 

 the two zinc electrodes, has the quantity 



E=A(*"-/)[l + B(2"+<)] 



=A[1 + 2B, ]|l{i-^( 6 -S- + ,-& 2 - + ...)}. (6) 



With the aid of this equation (6) the correctness of the 

 elementary law of diffusion might be tested and the value of 

 the constant k determined ; but a closer discussion of this 

 equation enables us to perceive that its peculiar form does 

 not permit any very accurate determination of the quantity k: 

 a very small error of observation in the measurement of the 

 electromotive force E has even a proportionally great influence 

 upon the value of the constant to be determined. On this 

 ground I have not made use of equation (6) for the definitive 

 measurement of the course of diffusion. I have, however, 

 employed it for the decision of the following, in many respects 

 interesting question : — Does the galvanic current passing 

 simultaneously with the diffusion-current through the salt- 

 solution possess any influence over the course of the diffusion 

 (i. e. over the magnitude of the diffusion-constant), or not ? 

 Eepeated series of experiments proved that the quantity of the 

 diffusion-constant determined by aid of equation (6) as good 

 as perfectly agreed with the value obtained for it from what 

 took place when the diffusion proceeded without the simulta- 

 neous passage of a galvanic current through the solution. 



