(R.T.B., Proc. Linn. Soc, N.S.W., 1900, p. 68o, t. XLVI, figs. 6a, 6b.)

Systematic. - A medium-sized tree, with a smooth bark, decorticating at the base of the trunk, producing a roughish appearance. Leaves small, of light yellowish colour, sometimes glaucous, oval, or ovate, shortly acuminate, mostly 2 inches long and § inch wide, rarely 3 inches long, petiole slender, under 1 inch long; venation faintly marked, lateral veins distinct, oblique, spreading, the intra-marginal vein removed from the edge, producing at the base of the leaf a trinerved appearance. Flowers in axillary or terminal panicles, six to eight in the head. Calyx tube under 2 lines long, 1 line in diameter, tapering into a slender pedicel; operculum hemispherical, depressed, very shortly acuminate.

Fruit. - Small on slender pedicels, or occasionally almost sessile, contracted slightly at the orifice; rim thin; valves not exserted; 2 lines long and 1 1/2es in diameter.

Not at all unlike those of E. crebra, E. polybractea, or a smaller form of E. caerulea.

Habitat. - Bathurst, Rylstone, Camboon, Hargraves, Gerogey, N.S.W.

REMARKS. - A medium-sized or rather stunted tree, growing in poor, sandy or rocky soil (Devonian). The bark is smooth, except occasionally a foot or two from the ground, where it is rough, something like a " Box " bark. It is allied to E. melliodora in the shape and venation of the leaves, and, perhaps, in the exterior character of the bark, but has not the yellow stain on the inner surface such as obtains in E. melliodora. It differs, however, from that species in the shape of the fruits, colour of timber, and chemical constituents of its oil. The typical E. polyanthemos, Sch., of Victoria, has a persistent "Box" bark, larger and more acuminate, orbicular shaped leaves and larger fruits. The oils of the two species are not at all identical; however, there is a resemblance in their timbers. It is an entirely different species from E. Dawsoni or E. polyanthemos.

ESSENTIAL OIL. - Leaves and terminal branchlets for distillation were obtained from Henbury, Rylstone, N.S.W., in December, 1918. The yield of oil was 0.7 per cent. The colour of the crude oil was a light orange-brown, and the odour quite rank and unpleasant. Much phellandrene was present, but pinene only detected in small quantity; a fairly large amount of the sesquiterpene was found. The esters were not pronounced.

The crude oil had specific gravity at 150 C. = 0.058; rotation aD - 8.°; refractive index at 200 = 1.864, and was soluble in 1 volume 80 per cent.alcohol. The saponification number for the esters and free acid was 6..

On rectification, 2 per cent, distilled below 1720 C. (corr.). Between 172-1880, 62 per cent, distilled; between 188-2560, 15 per cent, came over, and between 256-2700, 15 per cent, distilled. The third fraction consisted largely of the sesquiterpene. The fractions gave the following results: -

The oil 0f this species has little resembiance to that of E. polyanthemos, but corresponded to that of the "Lignum-vitæ" of St. Mary's (E. Fletcheri), the oils of both species containing similar constituents in practically the same amounts. At the time of distillation, the oil of E. ovalifolia contained a very small quantity of cineol, but after keeping for eighteen months it was found to contain about 15 per cent. of that constituent.