ESSENTIAL OILS OF THE ANGOPHORAS. 109 



In some iDstances, over 500 lbs. of leaves and branchlets 

 were distilled. 



To test the position of A. intermedia, material was 

 obtained both from Penrith, and from near Parramatta. 

 In the latter case no oil was obtainable, while in the former 

 not more than 10 drops of oil were distilled from 120 lbs. of 

 fresh material. 



The investigation of the oils thus obtained shows that 

 no marked differences in constituents can be detected 

 between the oils of the several species of Angophora. They 

 all consist largely of dextro-rotatory pinene with a uniformly 

 high specific rotation; two esters of geraniol (geranyl- 

 acetate and geranyl-valerianate), free geraniol, a high 

 boiling constituent, most probably a sesquiterpene ; with 

 small amounts of a volatile aldehyde and a low boiling 

 ester, the odour of which was that of amyl-acetate. Neither 

 cineol nor phellandrene were present even in traces. The 

 saponification number for the esters varied somewhat in 

 the several oils, but this factor may be perhaps considered 

 as accidental rather than discriminative, particularly as 

 the pinene in all the oils has practically the same optical 

 activity to the right, and does not vary much in amount. 



The general characters of the oils of the Angophoras are 

 thus in close agreement with those distilled from various 

 species of Eucalypts. None of the species of Angophora 

 can be considered of commercial value as oil producing 

 trees, yet the scientific results derived from their investi- 

 gation are of considerable value in helping to elucidate 

 the problems dealing with the origin and development of 

 the closely related genus Eucalyptus. 



The Essential Oils. 



Angophora Bakeri. 



This species is described in the previous paper, dealing 

 with the seedlings of the Angophoras, by Dr. Outhbert 



