49 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation were 

 received from Rydal, N.S.W., in October, 1909. The yield of oil was 0-26 per 

 cent. 



The crude oil was of a light amber colour, and had a terpene-like odour 

 with little resemblance to ordinary Eucalyptus oil. It consisted principally of 

 dextro-rotatory pinene, together with the sesquiterpene. Phellandrene was not 

 detected, and cineol was only present in very small amount. Esters occur in 

 some quantity, the principal one being geranyl-acetate. 



The oil of this species has a strong resemblance to that of E. acacicejormis. 

 The crude oil had specific gravity at 15 C. = 0-8854 ; rotation a + 24-7 ; 

 refractive index at 20 = 1-4717, and was insoluble in 10 volumes 80 per cent, 

 alcohol. The saponification number for the esters and free acid was 44, while 

 in the cold with two hours' contact it was 36. The secondary odour of the cold 

 saponified oil suggested geraniol. 



On rectification i per cent, distilled below 157 C. (corr.). Between 

 157-172, 62 per cent, distilled; between 172-194, 10 per cent, came over, and 

 between 194-276, 20 per cent, distilled. These fractions gave the following 

 results : 



First fraction, sp. gr. at 15 C. = 0-8606; rotation a D + 30-5; refractive 



index at 20 = 1-4665. 

 Second ,, ,, ,, : 0-8904; rotation D + 4-4 ; refractive 



index at 20 = 1-4747. 

 Third ,, ,, ,, = 0-9388; rotation too dark; refractive 



index at 20 = 1-4915. 



The cineol was determined by the resorcinol method in the portion 

 distilling below 194. When calculated for the crude oil the result was 8 per cent. 



I6i, Eucalyptus cornea. 



(R.T.B., Proc. Linn. Soc., N.S.W., 1906, p. 303). 



Systematic. A tall tree, attaining a height of 100 feet, with a dark- 

 coloured, stringy bark, persistent to the branchlets. Abnormal leaves opposite, 

 sessile, cordate, ovate, acuminate, thin, pale-coloured on the under side, shining, 

 up to 6 inches long and 3 inches broad. Normal leaves lanceolate falcate, up 

 to 9 inches long and from i to nearly 3 inches wide, often very oblique at the 

 base especially the larger leaves, coriaceous, pale-coloured on both sides ; 

 venation less pronounced than in abnormal leaves, intramarginal vein well 

 removed from the edge, lateral veins distinct, oblique and spreading. Inflorescence 

 usually in terminal panicles, but sometimes in axillary umbels. Calyx tube 

 turbinate, gradually tapering into the flattened pedicel ; operculum hemispherical, 

 shortly acuminate. 



Fruit. Hemispherical ; rim thin ; valves sunken ; 

 about 3 lines in diameter. 



The fruits morphologically much resemble those of 

 E. acmenioides. 



Habitat. Richmond River, and North Coast district, N'ew South 

 Wales, 



