45 



contact is rouglilj inversely proportioncal to the number of drops. 



It it clear that the results obtained with the described apparatus 

 give an indication only in rough approximation about the ratio of 

 the surface tensions of different glycerides in contact with aqueous 

 solutions. To determine this ratio quantitatively more accurate 

 measurements, are necessary than can be carried out with the Donnan 

 pipette. It will, however, appear in § 19 et seq. that the data 

 obtained in the described way, can qualitatively entii-ely account 

 for the phenomena that present themselves in the saponification of 

 fats. 



The obtained results are recorded in table I. 



TABLE 1. 



Trilaurine was obtained by recrystallisation of Tangkaliak fat 

 from alcohol, then from ether, tripalmitine by recrystallisation of 

 Chinese vegetable tallow from benzene, then washing of the obtained 

 product with alcohol, and again recrystallisation from ether. Tristearine 

 by recrystallisation of catalytically hardened linseed oil from benzene, 

 then also washing with alcohol and recrystallisation from ether. The 

 olive oil used was oil sold for consumption from French origin. 

 The linseed oil had been freed from free fatty acid as well as 

 possible by treatment with lye. From the constants recorded in 



