THE COLLOID-CHEMISTRY OF SOAPS 35 



The results in the case of two soaps of the oleic series (sodium 

 oleate and sodium erucate) with this series of alcohols are shown 

 photographically in the upper two rows of Fig. 28 and graphi. ill v 

 in Figs. 29 (A) and 30. 



The behavior of sodium elaidate (elaldic acid being an isomer 

 of oleic acid) is shown in the lowermost series of bottles of Fig. 28, 

 and graphically in Fig. 29 (B). The gelation capacity of thi- 

 soap differs from that of sodium oleate in that the maximal 

 gelation capacity is obtained with an alcohol in the mi. 1.1!.- .f 

 the series. In general all the gelation capacities lie below the 

 values obtained with sodium oleate. 



FIGURE 17. 



The experimental result > mvrring these three soaps' are given 

 in Tal.le XII. It is again apparent in the oleic series that the 

 Delation capacity increases with the height of the alcohol in the 

 series; while, when the erucate is compared with the oleate. tin- 

 former has a higher gelation capacity \\iih a given alcohol than 

 the latter, at least as far as the Innermost members are concerned. 

 We were not ^ .1 either ly direct < in.Iin-ct mean- (through 



primary solution in methyl alcohol rion values in the 



hmher alcohols alxrve that for ethyl alcohol. We cannot, how- 

 ever, say at this time whether tin- is a necessarily correct finding, 

 for our erucic acid was not absolutely pure. 



