122 



THEORY OF COLLOIDAL BEHAVIOR 



of the gelatin solution is in the funnel. This is not really neces- 

 sary but it is convenient and is accomplished by allowing the 

 collodion bag to press against the glass wall of the beaker con- 



1.8 2.0 22 24 26 28 3.0 3.2 3.4 3.6 3.8 40 42 4.4 46 4.8 



Fia. 41. Influence of pH and valency of anion on P.D. of solutions of different 

 gelatin-acid salts. The curves in Fig. 41 are similar to (but not identical with) 

 those in Fig. 14. 



taining the outside solution. As a minor but convenient acces- 

 sory each electrode is connected with a reservoir of saturated 

 KC1 solution which makes it possible to let the KC1 solution in 

 the capillary flow out after each measurement, so that the 

 electrode is always clean for each new measurement. What was 



