439 



E. Macarthuri grows quite well from seed, and the rapidity of growth 

 and the vitality of the species are remarkable, so that a continuation of supply 

 of leaf material for distillation from cultivated trees seems assured. 



The rapidity of growth can be judged from the illustration (Plate c), 

 which represents a shrub photographed 15 months after the seed was sown. 



PLATE C, 



EUCALYPTUS MACARTHURI. 



Grown from seed at Emerald, Victoria. Fifteen months' growth. 



A sample of the oil distilled from the clippings from bushes only 22 

 months old from the time of planting the seed, was presented to us by Mr. W. 

 Russel Grim wade, of Melbourne. This oil on analysis was found to agree 

 in general characters with that from naturally-grown material ; it contained 

 70-1 per cent, of geranyl-acetate, saponifiable in the cold with two hours' contact, 

 an amount of ester even greater than that usually found in the oil from 

 old trees, and equal to that from the " suckers." 



This result again supplies evidence as to the comparative constancy of the 

 oil products of identical species of Eucalyptus, a factor of cons : derable importance 

 when the cultivation of particular species of Eucalyptus is under consideration. 



EUCALYPTUS CITRIODORA 



It can also be demonstrated with other Eucalyptus species that the 

 formation of their characteristic odoriferous constituents commences very early 

 in the life history of the plant, and remains persistent throughout its whole 

 growth. In the very early leaves of the seedlings of E. citriodora, for instance, 

 the citronellal odour of the oil of this species can readily be detected, and this 

 is also the case with other Eucalypts, . the oils of which have a sufficiently 

 distinctive odour. 



