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H. G. SMITH. 



dalina, E. piperita, E. coriacea, etc., the oils of which consist 

 more or less largely of the terpene phellandrene, and those that 

 contain only a small quantity of pinene, or perhaps none at all. 

 Although the two species from which these pinenes were obtained 

 are types, both botanically and chemically, yet it is not to be sup- 

 posed that oils containing pinene are all devoid of phellandrene, 

 such not being the case. A variety of the Rylstone species (E. 

 Icevopineaf was obtained from Barber's Creek, the oil of which 

 was found to contain a small quantity of phellandrene, although 

 consisting almost entirely of the lsevorotatory pinene identical with 

 the pinene obtained from the type species. It is worth notice that 

 oils containing phellandrene are generally light coloured in their 

 crude state, while those not containing phellandrene are often 

 reddish in colour. This colour is readily removed by agitating with 

 potash, and it is of an acid character. Tt is not derived from the 

 eucalyptol (?cineol), as about the same minute quantity of eucalyptol 

 was found in the higher boiling portions of the Rylstone oil (a red 

 oil) as was found in that of its variety (oil almost colourless, being 

 light yellowish with a tinge of green). We cannot at present 

 derive much information from the colour of the crude Eucalyptus 

 oils, although it may be found eventually to have some bearing 

 on their constitution. 



The almost entire absence of eucalyptol in the oils of certain 

 members of this group, is also very characteristic, and it seems 

 possible that we may eventually be able to decide how this con- 

 stituent of Eucalyptus oils increases in quantity, as we go up or 

 down the series. 



This investigation was carried out on material obtained from 

 Barber's Creek ; from Currawang Creek near Braidwood ; and 

 from Nullo Mountain near Rylstone, all in this Colony. 



The material from Barber's Creek, from which the dextroro- 

 tatory pinene was obtained, was botanically identical with that 

 of the species forwarded by the Museum collector from Currawang 



1 Named E. loevopinea var. minor by Mr. Baker, loc. cit. 



