142 SOAPS AND PROTEINS 



81 (the concentration m/2) at 50 C. This is dependent, in our 

 judgment, upon the more perfect solubility at the lower con- 

 centration of the laurate in the water, with diminution of its 

 hydrophilic colloid properties as the temperature is raised. 



FIGURE 79. 



Fig. 82 shows the appearance of the foaming soaps just 

 described after having been left to themselves for two hours at the 

 designated temperatures and again demonstrates that foams die 

 down fastest in the lower soaps and at the higher tempera- 

 tures. 



