265 



The above oils were mixed together and stored in the dark, and in August, 

 1919, twenty-one years afterwards, the oil was again analysed. Not much 

 alteration had taken place during all that time, as the figures below will show, and 

 the reaction for phellandrene was just as pronounced as formerly. 66 per cent, 

 distilled below 190 C. The crude oil and the rectified portion gave the following 

 results : 



Crude oil, sp. gr. at 15 C. = 0-8945; rotation a n + 1-0; refractive index 



at 20 = 1-4904. 

 Rectified portion ,, =0-8624; rotation a D -- 14-2 ; refractive index 



at 20 = 1-4801. 



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

 when calculated for the crude oil the result was n per cent. 



144. Eucalyptus obliqua. 



(L'Hcr., in Sert. Angl., 18, t. 20.) 



(Syn. E. gigantea, Hook. f. ; E. falcifolia, Miq. ; E. nervosa, F.v.M.) 



Stringybark. 



Systematic. One of the largest trees on the Australian continent and in 

 Tasmania. Bark stringy, and not to be distinguished from that of other 

 Eucalypts to be found in that cortical class of Eucalypts. Abnormal leaves 

 oblique, oval to ovate-lanceolate, shortly acuminate, petiolate, pale-coloured 

 underneath, shining on the upper surface; venation distinct. Normal leaves 

 lanceolate, falcate, oblique, measuring from 6 to 10 inches long and i inch to over 

 2 inches wide ; venation distinct, lateral veins often very oblique, intramarginal 

 veins removed from the edges. Peduncles axillary, about 12 lines long, flattened, 

 bearing numerous flowers. Calyx tube conical, from i to 2 lines in diameter, 

 tapering to a short pedicel ; operculum hemispherical, acuminate. 



Fruit. Urn-shaped, or pyriform to hemispherical, 

 variable as to size, shortly pedicellate, 

 contracted at the rim, which is thin and 

 countersunk ; valves not exserted ; some- 

 times over 6 lines long and 4 lines wide. 



The pear-shaped fruit much resembles that of E. Dele- 

 gatensis, and the hemispherical that of E. regnans. 

 Its connection with E. gigantea, Hook. /., is fully 

 dealt with in our paper on Tasmanian EitC'.ilypts and 

 their Essential Oils, Roy. Soc. Tas., 1912. 



Habitat. -Tableland from Queensland into Victoria, at high 

 elevations ; South Australia ; Tasmania. 



REMARKS. This tree was the first Eucalyptus made known to science, and it was on this species that 

 the Genus was founded by L'Heritier. The original specimens came from Tasmania, but it occurs over extensive 

 areas in Victoria and in the New South Wales Coast Ranges. Its botanical and chemical characters are constant 

 throughout this extensive range. It derives its specific name from the unequal halves of its leaves ; but this is not a 

 good specific character, as several other Eucalypts have this particular feature well marked. Though much re- 

 sembling in'size,' -general appearance, and bark, t we- other species, i.e., E. fastigata, H.D. & J.H.ii.. and E. Delegatersts, 

 R.T.B., with which it is also, associated yet, nevertheless, in the field it is easily distinguished from them by its very 

 broad and rich green abnormal or young state leaves, and by the fact that the persistent bark runs nearly right out 

 to the branchlets, which is not the case in the two other species. 



50068- -S 



