AND THEIR ESSENTIAL OILS. 9 



The commercial possibilities of the several species for 

 oil-production, in comparison with those of the mainland, 

 can be judged from the results recorded in this paper, but 

 it might be well to direct attention to the glaucous species, 

 Eucalyptus Delegatcnsis, which is generally known 

 throughout the island as " Gum-topped Stringy-bark." 

 This species is now being used somewhat extensively in Tas- 

 mania as a timber-producing tree, and it might be well, 

 therefore, to consider the advisability of utilising the leaves 

 for their oil, instead of wasting them as at present. The 

 method of extracting the oil is most simple, and can be 

 carried out by ordinary labour, nor is there required much 

 outlay for plant, as one or two 400-gallon iron tanks, fitted 

 for the purpose, is all that is necessary, provided water is 

 available. The oil of this species could be used for mineral 

 separation, for which purpose it is in considerable demand. 

 The following list summarises the species and their oil 

 relations : 



Eucalypts which yield oils containing over 50 per cent, 

 of eucalyptol, the principal terpene being pinene : 

 both phellandrene and piperitone are absent: 

 E. cor data. 

 E. globulus. 

 E. Muelleri. 

 E. Perriniana. 

 E. Eodwayi. 

 E. unialata. 

 E . ur nig era. 

 E. vernicosa. 



Eucalypts which yield oils containing eucalyptol, 

 pinene, and phellandrene : eucalyptol between 50 

 and 25 per cent.: 



E. Gunnii. 

 E. viminalis. 



Eucalypts which yield oils containing over 50 per cent, 

 of eucalyptol, in which the terpene phellandrene 

 has largely replaced the pinene : piperitone is 

 present : 



E. linearis. 

 E. Eisdoni. 



Eucalypts which yield oils consisting largely of phel- 

 landrene, and containing less than 25 per cent, of 

 eucalyptol: piperitone is present: 

 E . amygdalina. 

 E. cocci f era. 



