JACQUES LOEB 



495 



viscosities had increased considerably and the viscosity of magnesium 

 and calcium gelatinate was now as great as was originally that of the 

 sodium gelatinate. Yet the conductivities were practically unaltered. 

 The experiment was continued as indicated in Table I and enor- 

 mous viscosities resulted, practically without any increase in the 

 conductivities. 



The reader will notice incidentally from the continuation of the 

 experiment that upon heating to 50°C. and cooling to 24° the viscosity 

 went practically back to its original level for the four different gela- 



TABLE I. 



Variation of Viscosity and Conductivity of Gelatin Solutions upon Standing. 

 Viscosity in Seconds of Outflozv, Conductivity, 



Ohms 



All Measurements at 24°C. 



tin salts. In this case the influence of the "history" upon the col- 

 loidal solution is entirely reversible. 



These experiments seem to exclude the assumption that the degree 

 of electrolytic dissociation of calcium gelatinate is so much smaller 

 than that of sodium gelatinate that it produces a ratio of 1 : 3 in the 

 osmotic pressure of the two solutions; and that the difference in the 

 degree of dissociation is compensated by the influence of viscosity 

 upon conductivity in such a way as to make the conductivities of the 

 solution of the two types of salts equal. 



