467 



"was a yield of 2 per cent, of oil obtained. The . oils of two 

 species from Kangaroo Island (E . cneorifolia and E. odorata) 

 are almost identical in composition with that yielded by E. 

 j)ol?/bractea, the "Silver-leaf Mallee" of Victoria, and the 

 "Bine Mallee" of New South Wales; and the oils of these 

 three species may be considered as being amongst the richest 

 in cineol content of all the oils yielded by the genus Euca- 

 lyptus. Most of the rectified oils of the species now described 

 for the first time were tinged yellow, and none was water-white 

 similar to those of the "Peppermints" and of the "Ashes." 

 This colour is traceable to the influence of the particular 

 phenol occurring in this group, which evidently forms a 

 ■quinone structure at certain stages. It does not appear to 

 contain a methoxy group in the para position similar to 

 Tasmanol — the phenol of the "Peppermint group" — and is 

 crystallizable. 



The oils of all the species contain esters, as do all crude 

 Eucalyptus oils, although in some cases very small in amount. 

 The esters in the oil of E. fascici/losa represented 7'7 per 

 •cent., if the alcohol had the C 10 H ]7 OH molecule, and the 

 acid acetic. The alcohol did not appear to be geraniol; but 

 the amount of oil at our disposal was altogether too small 

 for it to be isolated and determined. The ester, geranyl- 

 acetate, was present to the extent of about 14 per cent, in 

 the oil of E. acervula. Pinene was a constant constituent in 

 practically all the oils, although in some of them the amount- 

 was but small. Limonene was also detected in the oils of a 

 few species, as also was phellandrene. Cymene was deter- 

 mined as occurring in the oil of E . rostrata in some quantity, 

 and a good deal of work was done on the aromadendral, 

 which also occurs in this oil in fair amount. The oil from 

 E . rostrata from Kangaroo Island was of particular interest, 

 and analysis shows it to be in close agreement with those we 

 distilled from material collected many years ago at Albury, 

 and at Hay, in New South Wales. The results were pub- 

 lished in 1902 in our work, "A Research on the Eucalypts." 

 The oil distilled from the variety borealis of this species, while 

 being as comparatively constant in itself as that of the type, 

 has differences in constitution particularly marked, the two 

 forms being in this respect quite distinct. We have now 

 investigated material from both forms collected from several 

 localities widely separated, and quite recently oil distilled in 

 Victoria from the variety borealis has been analysed. 



It will be observed that only a few South Australian speci- 

 mens now remain of which the oils have not been investigated, 

 and we should be glad to receive material of these for distil- 

 lation and investigation. 



