THE COLLOID-CHEMISTRY OF SOAPS 



51 



gelation capacity as we ascend the acetic series. Sodium oWte 

 lies far below sodium stearate in its gelation capacity, while 

 sodium linolate was found to yield no gel at all. Both Table 

 XVII and Fig. 36 show that sodium erucate and sodium 

 elaidate (the isomer of the oleate) have a latoer gelation capacity 

 in trimethyleneglycol than has sodium oleate, but, as noted 

 above, we were not completely satisfied with the purity of our 

 erucic acid. 



FIGURE 37. 



The results of some experiments with ethyleneglycol and 

 soaps of the acetic and oleic series are shown in 1 IKS. 37 and 38. 

 The actual experimental findings are again contained in Table* 

 XVI and XVII. As apparent from the figures and the tables, 



only the higher members in each of the soap aerien will yield fell 

 with ethyleneglycol, the lower members yirhliim <>i,lv true eolu 

 1 1< .MS or crystalline deposits in the cooled reaction mixture*. 



