HENDERSON, COHN, CATHCART, WACHMAN, AND FENN 



463 



wise, to increase conductivity, aside from the direct effect of the ions 

 arising from those molecules of acid which remain free in the solu- 

 tion. Finally this value is compared with the total amount of acid 

 which has disappeared from the solution, and which may therefore 

 be held responsible, directly or indirectly, for this action. This com- 

 parison is expressed in the form of a ratio designated in Table II as R. 



It will be seen that there is a rough constancy of the ratio of cor- 

 rected salt conductivity to combined acid. As might have been ex- 

 pected, this is not true in the lower ranges of acidity where the experi- 

 mental errors, presum^ably of constant magnitude, are large in propor- 

 tion to the effects of the acid added. 



Disregarding the systems where the quantity of acid is small, it 

 may also be seen that the numbers vary in a regular manner. The 

 greater the hydrogen ion concentration, the greater are the values of 

 R (Table III). 



TABLE III. 

 Values of R. 



In order to investigate this subject, we may provisionally assume 

 that, however it comes about, the effect upon the conductivity of the 

 formation of a given amount of protein chloride is constant. Of 

 course this can be at best only a very rough approximation. As the 

 acidity decreases, the values of R tend to approach a limit which we 

 may take, for purposes of rough estimate, as 50, expressing the value 

 in round numbers. 



This makes possible an estimate, however hypothetical, of that 

 increment of the conductivity which is due to protein chloride, or is 



