112 H. G. SMITH. 



The saponification number of the ester as determined ia 

 the cold, with two hours' contact, was 19 2, so that this 

 portion, calculated as geranyl-acetate, was equal to 6*7 

 per cent, of that ester, and the remainder calculated as 

 geranyl- valerianate was equal to 6*1 per cent. 



A portion of the crude oil was acetylated by boiling one 

 and a half hours with acetic anhydride and anhydrous sodium 

 acetate in the usual way. The saponification number from 

 this was exactly 50. As no other alcohol was detected 

 than geraniol, with the exception, perhaps, of a trace of 

 amyl alcohol as acetate, the amount of free alcohol calcu- 

 lated as geraniol was 4*5 per cent. 



The sesquiterpene was only present in small amount in 

 the oil of this species. 



The composition of the oil of Angophora Bakeri may be 

 stated as follows : — 



Per cent. 



Dextro-rotatory pinene ... ... ... ... = 78*0 



Free geraniol = 4*5 



Geranyl-acetate = 6*7 



Geranyl- valerianate = 6*1 



Water, volatile aldehydes and low-boiling esters == 1*0 

 Sesquiterpene and undetermined = 3*7 



100*0 



Angophora melanoxylon. 

 This species was first described by my colleague, Mr. 

 R. T. Baker, f.l.s., in the Proceedings of the Linnean 

 Society of New South Wales, April, 1900. 



Chemistry. — This material was collected in the month 

 of March at Coolabah, New South Wales (430 miles west 

 of Sydney), and forwarded to the Museum by Mr. H. T. 

 Morgan, the Public School teacher at that place. It con- 

 sisted of fresh leaves and terminal branchlets collected as 

 would be done for commercial oil distillation. 



