462 



ACTION OF ACID AND ALKALI ON GLUTEN 



In Table II, which takes account only of the acid systems, because of 

 the greater consistency of the measurements, the concentration of free 

 hydrochloric acid is calculated from the measurements of hydrogen ion 

 concentration ; that part of the conductivity due to hydrochloric acid 

 is next calculated, and this is then subtracted from the observed con- 



ductivity. The remainder, given in Table II as ''salt conductivity," 

 represents the effect of all other ions than those which may be hypo- 

 thetically attributed to free hydrochloric acid. From this remainder 

 the conducti\ity of the system in the absence of hydrochloric acid is 

 subtracted and the result is called "corrected salt conductivity." 

 It represents the effect of the action of the acid, chemically or other- 



