JACQUES LOEB 



83 



where <p is the relative volume and ?? is a constant. In other words, if 

 Arrhenius's formula can account for the viscosity of these solutions 

 the logaritlim of the viscosity ratio when plotted over the concentra- 

 tion (Fig. 6), should give a straight line. The agreement of the 

 value for 45° and 35° with this theory is satisfactory (considering 

 the limits of accuracy of the measurements) , (Fig. 6) the logarithms 



60 



50 



=1 



40 



KM 

 o 



J 30- 



20 



10 



025 Q5 1.0 1.5 2.0 25 3.0 35 40 



Concentration of isoelectric gelatin in per cent 



Fig. 6. Showing that the logarithms of the viscosity of solutions of isoelectric 

 gelatin of different concentrations when plotted over the concentration as abscissae 

 are straight lines. 



of the viscosity increasing practically in direct proportion with the 

 concentration {i.e., the relative volume) of the gelatin in the solution 

 (Table III). At 60° the agreement is not quite so good but still 

 recognizable. At 25°, however, it is satisfactory only at the lowest 

 concentrations but at the higher concentrations the viscosity grows 

 more rapidly than the concentration. The reason for this, however, 

 is obvious since at this temperature the gelatin solution solidifies 



