190 A RESEARCH ON THE EUCALYPTS OF TASMANIA 



It is easy of recognition both in the field and herbarium. 



The timber is characteristic, and is closely related to the 

 " Gum-topped Stringy-barks " of Tasmania, E . Delegaten- 

 ns and E. r eg nans , but the sapwood is very liable to the 

 attacks of borers, which is not so in the case of E. Dele- 

 gatensis. 



Chemistry. 



Essential Oil. — Material of this species was collected 

 in July, 1908, at Mt. Wellington, at an altitude of about 

 2000 feet : and also at about the same time of the year 

 at Williamsford, on the West Coast of Tasmania. Both 

 the crude oils were of a reddish-brown colour, due to the 

 iron of the still, and both contained the same constituents, 

 and thus were similar in all characters. The results also 

 agreed with those obtained with the oil of this species 

 from Monga, New South Wales, collected in 1898, and 

 published in our work " Research oh the Eucalypts '' 

 (p. 188). The chief constituent of this oil is phellandrene, 

 and the high boiling aromatic 'aldehyde (aromadendral) 

 occurs in some quantity. Eucalyptol is present in very 

 small amount. Both eudesmol and piperitone are absent. 

 The following are the tabulated results for the crude 

 oils from the two localities : — 



Mt, Wellington. Williamsford. 



Yield of oil 0*66 percent. 0-66 percent. 



Phellandrene Abundant Abundant 



Aromadendral Pronounced Pronounced 



Specific gravity at 15° C .. 0-8836 0-8854 



Rotation aj, —28-1° —24-2° 



Refractive index at 24° ... . 1 • 4852 1 • 4843 



Soluble In 3^ vols. 80°/o In 4 vols. 80°/^ 



alcohol alcohol 



S.N. ester and free acid .... 8*1 7-2 



These results, together with the botanical characters, 

 indicate that the Tasmanian trees of this species are identi- 

 cal with those of New South Wales and Victoria. 



In August, 1912, leaves for distillation were collected 

 by Mr. Irby from doubtful trees, which, although growing 

 amongst E. ohliqua on Mt. Wellington at an altitude of 

 about 1000 feet, had a smooth top, the " stringy-bark " 

 only reaching to the branches. The oil distilled from this 

 material was identical in all respects with that of the 

 typical E. ohliqua. The yield of oil was 0768 per cent. ; 

 specific gravity of crude oil at 15° C. = 0*8845 ; rota- 

 tion aD= -28-80; refractive index at 19° = 1-4839, and 



