230 



The cineol was determined by the resorcinol method in the rectified portion 

 and calculated for the crude oil ; the result was 31 per cent. Only about 20 

 per cent, of cineol was present in the fraction as indicated by phosphoric acid, or 

 about 15 per cent, in the crude oil. This result is typical of the oils of the " Box " 

 group, and shows that constituents other than cineol are absorbed by resorcinol. 



In March, 1920, fresh material for distillation was collected at 

 Cabramatta, near Sydney. The yield and general characters of the oil were 

 in fair agreement with those previously obtained from this species, with the 

 exception that phellandrene was present at this time of the year, and con- 

 sequently the laevo-rotation was higher. Cymene was also detected and its 

 chemistry determined, as was also that of the pinene, which was slightly laevo- 

 rotatory. Cineol did not exceed 10 per cent, in the crude oil. A considerable 

 amount of alcoholic bodies was present, as the saponification number after 

 acetylation was 70-5. For the determination of the aromatic aldehydes see the 

 article on " The cyclic (aromatic) aldehydes occurring in Eucalyptus oils." 



122. Eucalyptus gracilis. 



(F.v.M., in Trans. Viet. Inst., i., 35, and" Eucalyptographia," Dec., iii, partim.) 



A Mallee. 



Systematic. A shrub or small tree with a smooth bark, having several 

 sterns from the same root. Leaves lanceolate, generally with a recurved point, 

 under 5 inches long, and J inch wide, thick or coriaceous, drying a light yellowish 

 colour, shining on both sides ; venation quite hidden or only traced with difficulty. 

 Peduncles short (3 lines long), flattened, axillary, with not more than half a dozen 

 flowers in the umbel. Calyx tube under 2 lines long, tapering into a short pedicel, 

 angular, i line in diameter ; operculum hemispherical, shortly acuminate. 



Fruit. On slender pedicels, oblong, cylindrical to 

 pyriform ; rim not thick, countersunk ; 

 valves not exserted ; from 2 to 3 lines 

 long, under 2 lines in diameter. 



In size and shipe they closely resemble E. polybractea 

 and E. viridis, bttt are of a yellow tint and not green 

 as obtains in those species. 



Habitat. Districts of the Darling and Murray Rivers, and as 

 far east as Gunbar, New South Wales; South 

 Australia; Victoria; Queensland. 



REMARKS.- The description given above refers to the " Mallee " occurring in the districts of the Murray 

 and Darling Kivers. A species is figured by Mueller in his " Eucalyptographia " under the above specific name, 

 but in the same plate he gives another figure, which is either E. viridis, K.T.B., or a narrow leaf form of E. H'oollsiana, 

 R.T.B. Mr. Maiden synonymises it under E. calycogona, var. gracilis .Cr. Rev. vol. i, p. 79), but later loc. cit. (vol. iv, 

 p. 262), restores it to specific rank. 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation were 

 obtained from Gunbar, N.S.W., in December, 1900. The yield of oil was 0-9 per 

 cent. The crude oil was amber-coloured, and had an odour resembling those in 

 which aromadendral is a pronounced constituent. Pinene was present, and this 



