detrimental effect upon the oil and should be removed 

 as far as possible. 



The above analysis would seem to indicate that the 

 chief difference between the Californian and Australian 

 oils is in the exceedingly high content of pinene found 

 in the Californian oil; this would account for the high 

 rotation and low specific gravity of this oil. In order 

 to determine the effect of the pinene upon the solubility 

 in alcohol, pure pinene and cineol were mixed in definite 

 proportions and the solubility in alcohol determined. 

 Fig. Ill shows the effect of varying concentrations of 

 pinene upon the solubility of cineol. It is readily seen 

 that above certain percentages of pinene the mixture 

 would become practically insoluble in 70 per cent 

 alcohol. 



SUMMARY 



The above investigation has brought out the follow- 

 ing facts: 



I The oil from the Eucalyptus globulus, from trees 

 grown in California, has the same constituents as the 

 oil of the Australian trees but in different proportions. 



II The reason why the Californian oil does not 

 fulfil the U. S. P. requirements is probably due in great 

 part to the exceptionally high pinene content. 



Since Eucalyptus oil could be easily produced in 

 large quantities in various parts of California and other 

 Pacific coast states, a method of refining the oil so as 

 to bring it up to the U. S. P. specifications would be 

 particularly valuable. The investigation is being con- 

 tinued by the present authors with this idea in view. 



CHEMICAL LABORATORY 



UNIVERSITY OF CALIFORNIA 



BERKELEY 



(7) 



