76 



Under a pressure of 13 millimetres the mixed fatty acids distil un- 

 changed, at a temperature of 220°-225°C. The specific gravities of 

 the acids from akee oil and palm oil closely correspond, in fact it will 

 be noticed throughout the whole table that as a rule the figures for 

 akee oil and palm oil closely approximate. 



A comparison of the iodine values shows that the percentage of 

 liquid, or unsaturated glycerides — olein — is considerably less in akee 

 oil than in olive oil, and slightly less than in palm oil. 



A comparison of the melting and solidifying points leads to the 

 conclusion that the solid glycerides — palmatin — in palm oil have a 

 higher melting point than those in akee oil, and this more than coun- 

 terbalances the slightly higher pecentage of liquid glycerides in the 

 former. 



Separation of the Solid and Liquid Acids. 



This is partially effected by treating the lead salts of the fatty acids 

 with ether, in which the lead salts of the liquid aoids are soluble, and 

 those of the solid acids insoluble. The separation, however, has been 

 shown to be incomplete, as the acids from the insoluble lead salts still 

 give appreciable iodine values. 



The acid regenerated from the ether-soluble lead salts was a pale 

 yellow, liquid oil. Its iodine value was found to be 82*4 ; the lead salt 

 was found on analysis to contain 27*9 per cent, of lead. For pure 

 oleio acid theory requires an iodine value of 90, and a lead salt con- 

 taining 26*9 per cent, of lead. This liquid acid is apparently impure 

 oleio aoid. 



The acid regenerate i from the insoluble lead salts had a melting 

 point of 52°-54°C. It was washed with four successive small quanti- 

 ties of cold alcohol, to remove the last traces of the liquid acids. 

 After this treatment it appeared as a white, finely crystalline powder, 

 melting at 55°-56°C. Recrystallised from alcohol it melted at 56°-67°C., 

 and repeated crystallisation caused no rise in the melting point. 



This acid has not yet been identified. It may possibly be a mix- 

 ture of palmitic and stearic acids, or it may be a near homologue of 

 these acids. The constant melting points to the latter alternative, and 

 the faot that the melting and solidifying points of palm oil and its 

 acids are higher all round than those of akee oil lends weight to this 

 idea, since the solid part of palm oil consists almost entirely of pal- 

 mitic acid and palmitin. 



Akee oil contains approximately about 50 per cent, of liquid gly- 

 cerides, calculated as olein, from the iodine value ; about 40 per 

 cent of solid glycerides, and about 10 per cent, of the free aoids con- 

 tained in these glycerides. 



The oil-cake consisting of the pressed seeds still contains 25 per 

 cent, of oils, which can be extracted by solvents. 



Twenty grams, cut small, dried in a water oven, and extracted in a 

 Soxhlet apparatus with petroleum ether, yielded 5 grams of oil on dis- 

 tilling of the solvent. 



The residue from the petroleum ether treatment was extracted 

 with hot 90 per cent alcohol. The alcohol was distilled off, and 



