The yield of oil from E. citriodora from naturally grown material is about 

 0-7 per cent, for leaves and terminal branchlets, and the product is in considerable 

 demand and sells at a high price. The species thus gives promise of success if 

 it were systematically cultivated, and it is evident that it must be more 

 satisfactory to collect the material for distillation from cultivated plants than 

 from big trees. 



EUCALYPTUS STAIGERIANA. 



This tree is also a Queensland species and yields an abundance of oil of 

 quite a remarkable character for a Eucalyptus species, as it consists very largely 

 of citra-1 and limonene. The oil, in constitution, has thus quite a strong 

 resemblance to lemon oil, and it seems reasonable to suppose, that when 

 properly prepared for market it will become in favour as a flavouring agent, 

 and in many ways take the place of lemon oil. Evidence is wanting as to its 

 power of reproduction under cultivation, as it has not been planted to any 

 extent in the Southern States. The species is, however, a very promising one, 

 as the yield of oil is so great, and from cultivated material this should be 

 produced at a lower price than lemon oil. The species may thus be considered 

 as one of the many promising Eucalypts for essential oil production, and to be 

 worthy of industrial effort in the direction of its cultivation. 



Cincol Oils. 



THE present demand for the richer cineol Eucalyptus oils can be met very 

 largely from species growing naturally in Australia, although for some time 

 past the request for oils of this character has far exceeded the supply. The 

 question of systematically cultivating the more promising species for cineol oil 

 production, therefore, merits some consideration, in order to overcome certain 

 disabilities at present operating, such as distance, distribution, and labour. 



In countries outside Australia, E. globulus and a few other oil-yielding 

 Eucalypts have been cultivated, primarily of course for timber, so that 

 the oil produced from these trees has hardly been of much commercial 

 importance. The best and most prolific oil-yielding species have not, until 

 quite recently, attracted much attention in other countries, so that Eucalyptus 

 oil production may be considered as essentially an Australian industry, the 

 present position of which is such as to be considered worthy of every support. 



EUCALYPTUS SMITHII. 



'The rapidity of growth shown by cultivated trees of some of the cineol 

 oil-producing species is extraordinary, and this has often been pointed 

 out, particularly with E. globulus. We have given some attention to this 

 matter in connection with the excellent cineol oil-bearing species E. Smithii, 

 and the results so far obtained are recorded herewith. 



The natural habitat of this species is on the highlands, at an altitude of 

 about 2000 to 3000 feet, and it might be thought perhaps that if planted at sea 

 level, some differences in the rapidity of growth as well as in the composition of 

 the oil might be observed. These changes, however, have not eventuated, as the 

 results obtained with a cultivated tree, grown near. Sydney, practically at sea- 

 level, gave evidence of great stability in both directions. 



50068 2F 



