JACQUES LOEB 



483 



buffer solutions consisting of mixtures of m/50 acetic acid and m/50 

 Na acetate in the proper proportions to give a pH 4.7, 5.6, or 3.4. So- 

 lutions of different concentrations of Ce(N03)3 were made up in these 

 buffer solutions and put into the collodion bags. The outside solutions 



280 

 260 

 240 

 ^ 220 

 B 200 

 ISO 



Q 



^ 160 

 G 



'Z 140 



g-100 

 O 60 



B 

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60 

 40 

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^ Z048 1024 512 256 128 64 32 



Concentration 



Fig. 6. Influence of Ce(N03)3 on the transport curve in the presence of buffer 

 solutions (mixtures of M/50 acetic acid and m/50 Na acetate). 



were the same buffer solutions without the Ce(N03)3- The curves in 

 Fig. 6 represent the transport values in 20 minutes. We will first 

 direct our attention to the transport curve at pH 4.7. It is clear that 

 at the isoelectric point the transport curve for Ce(N03)3 rises again 

 steeply, thus supporting the idea that the Ce(N03)3 reacts with the 



