482 



The crude oil had specific gravity at- 15° C.=0'9307; 

 rotation, a D — 1'4°; refractive index at 20° C. = T487, and 

 was soluble in one volume 80 per cent, alcohol, but became 

 very turbid on addition of excess of alcohol. The high 

 specific gravity, refractive index, and colour reactions suggest 

 the presence of a fair amount of sesquiterpene. The large 

 amount of ester renders the oil somewhat soluble in alcohol, 

 but with excess of alcohol the presence of a solid paraffin in 

 some quantity is indicated. 



The results of the analysis of this oil, as shown above, 

 very closely resemble those we obtained for E . acervula from 

 Tasmania. This is particularly noticeable through the ester 

 and the solid paraffin, and allowing for differences in yield 

 of oil and a consequent lower specific gravity in the Tasmanian 

 material, the physical characters may be considered in agree- 

 ment. 



The presence of the aromatic alcohol, geraniol, in the 

 oil of this South Australian tree is worthy of reference, in 

 view of Hooker's remarks in his "Flora Tasmaniae," in which 

 he states "that the bruised foliage has a much sweeter cdour 

 than is usual in the genus." This observation was made over 

 fifty years ago. 



24. Eucalyptus viminalis, Labill. (PI. New Holl., ii., 126 



to 151). 

 "Manna Gum." 



Few species of Eucalypts are so widely distributed in 

 Australia as E . viminalis, consequently it has several common 

 names, the most general being "Manna Gum." It is re- 

 stricted to the south-eastern portion of this State. A full 

 svstematic description and plate, as well as other relevant 

 matter on the species, are given in Brown's "Forest Flora of 

 South Australia," 1882. 



It is botanically and chemically described in our work on 

 "Eucalypts and their Essential Oils," p. 137. 



25. Eucalyptus rostrata, Schlecht. (Linnea. xx., 655). 



"Red Gum." 



Being a distinct tree, and easily recognized from its loca- 

 tion, very little confusion has occurred in connection with 

 the nomenclature of this species. It is almost invariably 

 found on the banks of rivers, billabongs, and courses of old 

 rivers. Its most common name is "Murray Red Gum," but 

 it has a much larger distribution than that name implies. 



