VISCOSITY 



201 



egg albumin suggests a small relative volume; and if this be true 

 the viscosity of solutions of crystalline egg albumin should obey 

 the Einstein formula; while the high order of magnitude of 

 viscosity of the solutions of gelatin suggests that a larger volume is 



0.25 0.5 1.0 15 20 5 3.0 



Concentration of gelatin in per cent 



4.0 



FIG. 51. Influence of concentration on the viscosity of solutions of isoelectric 



gelatin. 



occupied by the gelatin particles in solution and hence the con- 

 stant 2.5 of Einstein's formula should be found too small; in other 

 words, the Einstein formula should be replaced by some other 

 formula, e.g., that of Arrhenius. 



Einstein's formula is = 1 + 2.5<p, where <p is the relative 



*?o 



volume occupied by the protein in the solution, and - is the 



