220 



F. Phenols. 



The crude oil contains a small amount of phenols. One 

 litre of th-e crude oil was shaken with 300 ecs. of a 5 per cent, 

 sodium hydroxide solution, and the aqueous liquor separated 

 and shaken with ether to remove adhering oil. It was next 

 acidified, extracted with ether, and the latter evaporated 

 off. The residue was washed with sodium bicarbonate solu- 

 tion, extracted with ether and evaporated. The final yield 

 was 2 CCS., which is equivalent to 0'2 per cent, of the crude 

 oil. Beyond applying qualitative tests, no further work was 

 done, owing to the small amount of material available. 



G. Alteration of the Specific Gravity, Rotation, 



Refractive Index of the Crude Oil on keeping. 



The following table gives a summary of the results 

 obtained : — 







Rota- 



Specific 



Refract. 



Disper- 





Sample. 



tion. 



Gravity. 



Index. 



sion. 



1. 



Crude oil freshly dis- 













tilled (Jan., 1920) 



-9-5° 



0^9102 



• — ■ 



— 



2. 



Crude oil stored in a 

 tightly-corked bottle 

 in the dark for 1-J 













years 



-9-0° 



0-9105 



— 



— 



S. 



Crude oil stored in a 

 loosely-corked iron 













drum for 1^ years 



-7-3° 



0-9145 



1-4707 



0-01029 



4. 



Crude oil exposed to 













light in white glass 













for 1^ years 



-4-7° 



0-9311 



1-4728 



0-01033 



Conclusion. — The specific gravity increases on keeping, 

 while the rotation diminishes. The refractive index and the 

 dispersion also increase. These changes are accelerated by 

 exposure to light, and are probably caused by the polymeri- 

 sation of the terpenes and /or aldehydes. 



Summary. 



The results of this investigation have shown that the oil 

 from the leaves and twigs of Eucalyptus cneorifolia distilled 

 in January has the following approximate composition : — 

 Cineol ... 67% 



Cymene 

 Limonene 

 Pinene ... ... 



Aldehydes — Gumic Aldelhyde 



Aromadendrai 



Cryptal 



Cneoral 

 Sesquiterpene 

 Phenols, esters, and acids 



5% 



3% 



7-5% 



1% 

 0-5% 



