THE COLLOID-CHEMISTRY OF SOAPS 61 



are seen to yield gels with turpentine, gasoline, benzene, toluene, 

 chloroform and carbon tetrachlorid. The list of " solvents " 

 which yield such results can be further lengthened as shown in 

 Figs. 44, 45 and 46 by observing that meta-, ortho- and para- 

 xylene, die thy 1 and butyl ethers, benzaldehyd and paraldehyd, 

 turpentine, limonene, pinene, gasoline, heptane, ethyl oenan- 

 t hate, amyl acetate and triacetin all yield satisfactory results. 

 The experimental details covering Fig. 43 are contained in Table 

 XX; those covering Figs. 44, 45 and 46 in Table XXI. It 



FIGURE 44. 



should be noted that the gelation capacities of Table XX are 

 the maximal values; in the rest of the series we contented our- 

 selves with the mere finding that lyophilic colloid systems could 

 be produced from the soaps and " solvents " chosen for study. 



These findings indicate that a large variety of different " sol- 

 vents " may all yield lyophilic colloid systems, even though there 

 is little chemical relationship between the members of the various 

 groups studied. What this means for the general theory of the 

 lyophilic colloid state is now to be discussed. 



