200 



H. G. SMITH. 



the corresponding laevorotatory pinene appears now to conclusively 

 show that such is the case, and that we have existing in the oils 

 of the Eucalypts two pinenes, one of which is probably the physical 

 isomeride of the other. 



By obtaining the nitrosochloride I have been able to detect the 

 presence of pinene in nearly all the oils of the class of Eucalypts 

 to which E. globulus belongs, such as E, Bridgesiana, E. gonio- 

 calyx etc., but it is only present in these oils in very small quantity, 

 the greater portion of their constituents being terpenes other than 

 pinene, and eucalyptol. The two species of Eucalyptus from which 

 these present pinenes were obtained form part of a different group 

 altogether from that to which E. globulus belongs. The Stringy- 

 barks are a group the investigation of whose oils has been of great 

 assistance in extending our knowledge of the constituents of the 

 oils of the genus. 



Eucalyptol is almost entirely absent from the oils of the two 

 species now under consideration, as it was only possible to detect 

 its presence in the higher boiling portions, and even then it could 

 not be detected by phosphoric acid, its presence in minute quantity 

 being determined by iodol and also by bromine. Whether at 

 other times of the year eucalyptol would be found to be present 

 in greater quantity is of course a matter for future investigation. 



On redistilling the oil from the Currawang Creek sample 63 per 

 cent, was obtained between 156° and 162° C. 1 and 25 per cent, 

 more distilled between 162° and 172° 0. On distilling the oil 

 from Barber's Creek under exactly the same conditions, 62 per 

 cent, was obtained between 156° and 162° and 25 per cent, more 

 between 162° and 172° C. These oils were practically identical, 

 although the oil from the Barber's Creek sample was rather more 

 dextrorotatory than that from Currawang Creek, but this differ- 

 ence might be expected, because our experiments show that the 

 oils obtained from the trees of the same species growing together 

 under exactly similar conditions have not the same rotation, but 



1 The temperatures given in this paper are all corrected, and stated to 

 the nearest whole degree. 



