188 THEORY OF COLLOIDAL BEHAVIOR 



of albumin chloride were measured and calculated for 2y -\- z 2x. 

 The difference, which should be the osmotic pressure of the albu- 

 min particles in solution, is found in the last row. It is almost 

 identical with the difference found for gelatin chloride for the 

 same concentration of gelatin. 



We therefore come to the conclusion that the Donnan equilib- 

 rium theory allows us to explain and to derive mathematically 

 the influence of pH, of valency of ions, of concentration of neutral 

 salt, and of concentration of protein on the osmotic pressure; 

 and that the values calculated for the osmotic pressure on the 

 basis of this theory agree within the limits of the accuracy of the 

 experiments with those actually observed, though the accuracy 

 of the experiments is considerably less than in the case of the 

 P.D. measurements. 



