(F.v.M., in Vic. Nat. October, 1890, p. 76.) Brown Gum.

Systematic. - A tree only known, so far, from the Sugar Loaf Mountain, Clyde-road, between Nelligen and Braidwood, occurring there on the very rocky declivities at an altitude from 2,000-4,000 feet; attaining at the lowest level a diameter of 2 feet and a height from 40 to 60 feet, while at the highest elevation (4,000 feet) it grows shrubby or in "mallee" form 4 to 10 feet high, flowering profusely. It has a habit of growing in clusters of perhaps four to eight small-sized trees, springing from an enormous bulging and spreading stock, irregular in shape, of a diameter from 4 to 10 feet or more. On the lower levels the larger trees grow straight, with a smooth, light brown and very thin bark; smooth within 1 or 2 feet of the ground. Leaves somewhat shining and of the same appearance on both sides, the umbels regularly three-flowered. Calyx angular, sessile; operculum much constricted, rostrate, angular.

Fruit. Inclined to be hemispherical in shape, occasionally ribbed; rim broad, outer edge recurved; valves prominent, and exserted; under 1/2 inch in diameter.

It is probably only a depauperate form of E. globulus.

Habitat. - Sugar Loaf Mountain, Braidwood, N.S.W.

ESSENTIAL OIL. - Leaves and terminal branchlets for distillation were obtained from Monga, New South Wales, in August, 1898. The yield of oil was 0.33 per cent. The crude oil was but little coloured, and had an odour resembling the crude pinene-cineol Eucalyptus oils generally. It contained no phellandrene, but pinene and cineol were both present. Eudesmol was detected by crystallisation. The third fraction consisted largely of the sesquiterpene.

The crude oil had specific gravity at 15o C. = 0.8895, rotation aD + 4.05°; refractive index at 20o = 1.4784, and was soluble in 4 volumes 80 per cent. alcohol. The saponification number for the esters and free acid was 9.98.

On rectification 2 per cent. distilled below 170o C. (corr.). Between 170-183o, 78 per cent. distilled; between 183-240o, 11 per cent. came over, and between 240-2800, 7 per cent. distilled. These fractions gave the following results: -

The cineol, determined by the phosphoric acid method in the large traction was 24 per cent., indicating about 20 per cent, in the original oil (O.M.).