148 



SOAPS AND PROTEINS 



Fig. 87 illustrates the foaming qualities of the potassium soaps 

 of the acetic series in the concentration m/2. The first soap to 



FIGURE 87. 



show any foaming is the caprate, but its foam dies down completely 

 in two hours, as shown by its absence in the series of tubes marked 

 8 of Fig. 88. It will be observed when the laurate, myristate, 



