ESSENTIAL OILS OF THE ANGOPHORAS. 117 



cent, of the oil of this species of Angophora consists of 

 pinene. 



The saponification number for the esters and free acids 

 was 18*9, thus showing that the esters were present in 

 somewhat less amount than in the oils of either A. Bakeri 

 or A. melanoxylon. 



Angophora lanceolata. 



This species was described by Cavanilles in 1797. It is 

 a common tree in the neighbourhood of Sydney, and grows 

 principally on the Hawkesbury Sandstone formation. This 

 kind of acid soil is the one it naturally selects by choice, 

 and throughout its wide distribution it still clings to the 

 sandstone. In the district around Warialda, where the 

 low hills are capped with sandstone, this tree is also found 

 growing. It is the only Angophora with a smooth bark ; 

 all the others have thick, semi-fibrous, soft barks. 



Chemistry. — Material of this species for oil distillation 

 was collected at the Military Reserve, Mosman, Sydney, 

 in the month of June. The yield of oil was very small, 

 equalling only 0*013 per cent. It was a somewhat thick 

 oil and with such a small amount it was difficult to separate. 

 The specific gravity of the crude oil at 15° O. = 0*927; and 

 the refractive index — 1*4946; the oil was insoluble in 10 

 volumes 80 per cent, alcohol. These results indicate a 

 considerable amount of the sesquiterpene. The saponifica- 

 tion number of the esters and free acid by boiling was 24*2; 

 and in the cold with two hours contact 10*1. The secondary 

 odour of the separated saponified oil was that of geraniol, 

 so that judging from the results with the other oils, it may 

 be considered that the geranyl-acetate equalled 3*53 per 

 cent., and the geranyl-valerianate 5*99 per cent. 



The available oil was then distilled, and 4 cc. obtained, 

 boiling between 157 - 163° C. (corr.). This had a pinene 



