(F.v.M., in Fragm. xi, II, 1878.) Salmon-coloured Gum.

Systematic. - A tree when aged, reaching 100 feet in height, the bark smooth, grey, and somewhat purplish, of an oily lustre. Abnormal leaves ovate to ovate-lanceolate, dull on both sides. Normal leaves narrow-lanceolate, acuminate, falcate, 3 inches long, shining on either side; venation very indistinct, intramarginal vein scarcely removed from the edge, lateral veins spreading, inclined at about 45° to the mid-rib. Peduncles 3 to 4 lines long, at first axillary, bearing umbels of about six flowers. Buds shining. Calyx tube semi-ovate, little more than one line long, on a pedicel of equal length; operculum conoidal, semi-ovate, as long or slightly longer than the tube.

Fruit. - Small, hemispherical to pilular, shining; rim narrow, slightly domed; valves acuminate, much exserted; 1 1/2 lines long and 1 1/4 lines in diameter.

Similar in shape and differs only in the minutest details from those of E. oleosa.

Habitat. - Western Australia.

REMARKS.- -It is just possible this may be the Western tree-form of E. oleosa, for these species have much in common, and the physical and chemical properties are not easy to separate.

ESSENTIAL OIL. - Material for distillation was received from Western Australia in August, 1904. The exact locality from which the leaves were collected is not known, but the consignment was forwarded from Perth. The material had been collected as is usual for commercial purposes. The yield of oil was 1.44 per cent. The crude oil was reddish in colour, indicating the presence of phenols, and an odour representative of the cineol-pinene Eucalyptus oils generally, with a secondary one suggesting aromadendral. The principal constituents in the oil were dextro-rotatory pinene, cineol, and a sesquiterpene. Phellandrene was not present, and the amount of volatile aldehydes was small. High-boiling constituents were only present in small amount, and 92 per cent, distilled below 1830 C. The laevo-rotation of the higher boiling fraction was due to the aromadendral. Although the oil contained a fair amount of cineol, yet it was deficient in the quantity demanded by the British Pharmacopoeia standard.

The crude oil had specific gravity at 150 C. = 0.9076°, rotation aD + 6.3°; refractive index at 20° = 1.4681, and was soluble in 3 1/2 volumes 70 per cent, alcohol. The saponification number for the esters and free acid was 4.9.

On rectification 1 per cent. distilled below 166° C. (corr.) Between 166-172°, 40 per cent. distilled; between 172-183°, 50 per cent. came over, and between 183-224°, 6 per cent, distilled. These fractions gave the following results: -

The cineoi, determined by the phosphonc acid method in the crude on, was 48 per cent. (O.M.)

The rectified oil boiling below 183° (90 per cent, of the whole) had specific gravity at 150 = 0.9052, and gave a return of 52 per cent, cineoi, when determined by phosphoric acid (O.M.).

The oil of this species is thus a fair one, but owing to the comparative absence of high-boiling constituents the gravity is low.

The results obtained with the oil of this species were published by us in the Pharmaceutical Journal, London, September, 1905.