ESSENTIAL OILS OF THE ANGOPHORAS. 115 



gave an ethereal odour of apples. The reactions thus 

 indicated the presence of acetic and valerianic as the acids 

 of the esters. These acids were thus in combination with 

 the barium as follows : — 32*64 per cent, barium acetate, 

 and 67*36 per cent, barium valerianate. 



The oil separated after saponification was steam distilled 

 and in the portion which came over, the odour of geraniol 

 was most prominent ; the distilled water also had an odour 

 strongly resembling that of rose water. When mildly 

 oxidised with bichromate of potassium in sulphuric acid, 

 the aldehyde citral was readily formed. It thus appears 

 that geraniol is the only alcohol in these esters, and that 

 it is in combination with both acids in the oils of the 

 Angophoras. 



A portion of the crude oil was acetylated in the usual 

 way and the saponification of this gave results indicating 

 that 5*1 per cent, of free geraniol was present in the oil of 

 this species. 



From the above determinations the composition of the 

 oil of A, melanoxylon maybe stated as follows: 



Pinene 



Free geraniol 



Geranyl acetate ... 



Geranyl valerianate 



Water, volatile aldehydes and low-boiling estei 



Sesquiterpene and undetermined 



Per cent. 



= 72'0 

 = 5*1 

 = 6*9 

 = 9*6 

 = 1*0 

 = 5*4 



100*0 



Power and Kleber 1 show geraniol to be present in the 

 oil of Sassafras leaves in combination with both acetic and 

 valerianic acids. 



Angophora species. 



This species, which grows in the neighbourhood of 

 Bingara, New South Wales, (370 miles north of Sydney), is 



1 Pharm. Review, xiv, p. 103. 



