i68 



The above sample had been stored in the dark, and in September, 1919, 

 was again analysed. Not much alteration had taken place during the nineteen 

 years it had been kept. 78 per cent, distilled below 190 C. The crude oil and 

 the redistilled portion gave the following results : 



Crude oil, sp. gr. at 15 C. == 0.9276; rotation a + 0-5; refractive index 



at 20 = 1-4682. 

 Rectified portion = 0-9219; rotation D + 1-8; refractive index 



at 20 = 1-4606. 



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

 and calculated for the crude oil; the result was 74 per cent. By the rapid 

 phosphoric acid method it was 68 per cent, when calculated for the crude 

 oil. Terpineol was detected in the rectified portion. 



90. Eucalyptus cordata. 



(Labill., PL Nov. Holl., ii, 13, t. 152, 1806.) 



Systematic. A small glaucous tree or shrub, with a smooth, deciduous 

 bark. Leaves opposite, thinly coriaceous, obcordate, broadly ovate, ovate- 

 acuminate, crenate, 2 to 3 inches long ; venation not distinctly marked, lateral 

 veins oblique, spreading and looping some distance from the edge. Peduncles 

 axillary, terete, about 3 lines long, with three sessile flowers in the umbel. 

 Calyx conical to cylindrical, about 3 lines in diameter; operculum depressed- 

 hemispherical, obtuse or umbonate, much shorter than the calyx tube. 



Fruit. Depressed-globular, of a bluish colour, con- 

 tracted below the orifice; rim not thick, 

 the capsule somewhat sunk; valves not 

 exserted; about 6 lines in diameter. 



Fruits are distinct from any others, the nearest being 

 some forms o/E. goniocalyx. 



Habitat. Recherche Bay and Huon River, Huon Road, 

 head of Hobart Water Supply, Tasmania. 



REMARKS. This Eucalypt is peculiar to Tasmania. Its nearest ally in Australia is Sim's E.pul,, m- 

 lentn The two, however, are quite distinct as recorded by Hooker, Sims, Robert Brown, and Bentham. Having 

 visited Tasmania for the purpose of botanical investigation, we have now seen both trees in the field, and our 

 observations quite agree with the classification of those botanists. This tree has an erect habit quite dissimilar to 

 that of E. pulverulent a, with its " weak, green, almost clinging, stems." ( Vide Note in this Work under /:. pulveru- 

 lent a.) 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation were 

 obtained from Tasmania, in March, 1902. The yield of oil was 2-3 per cent. ; 

 this is a very high yield for an oil rich in cineol, so that this species may be con- 

 sidered as one of the best of the cineol-pinene class of Eucalyptus oils, 

 which do' not contain phellandrene. The crude oil was of an orange-brown 

 colour, and had an odour resembling the cineol-pinene oils generally. Volatile 

 aldehydes were present in some quantity, and altogether the oil resembled in 

 general chemical characters, those derived from E. pulverulenta and E. cinerea. 

 Cineol was the most abundant constituent in the oil ; dextro-rotatory pinene 

 was present, but phellandrene was absent. Esters were present in some quantity 

 for an oil of this class, and in this resembled those of the species above mertioned. 



