194 



HYDROGEN ION CONCENTRATION 



chains, in which other electrolytes instead of dimethylaniUne- 

 HCl were employed (the NaCl side being left unchanged). 



If it is kept in mind that the conductance is but an approximate 

 measure of the ionic concentration, it becomes evident that the 

 calculated and observed values are in very significant agreement. 



Table 29 shows the results of a few more of Beutner's experiments 

 with p-cresol. These relationships represent perhaps some of the 

 most important recent advances in physiological physics, for here 

 we have succeeded for the first tune in obtaining electromotive 



TABLE 29 



forces of the order of magnitude of those observed physiologically, 

 without the participation of free metals. 



It is also possible to arrange chains with phases which have no 

 ion in common, as, for example, the following: 



Na2S04 

 in water 



Oil 



KCl 

 in water 



The oil contains Na2S04 in its left boundary layer in the corre- 

 sponding distribution equilibrium, and KCl, in a similar way, in 



