(R.T.B., Proc. Linn. Soc, N.S.W., 1901, p. 676.) Apple-top Box.

Systematic. - A medium-sized tree, with a white box bark, persistent to the ultimate branchlets. Abnormal leaves ovate-acuminate, cordate, shortly petio-late, glaucous, variable in size from 1 to 3 or 4 inches long, and 1 to 3 inches broad; venation indistinct on both sides. Normal leaves narrow-lanceolate, about 6 inches long, acuminate, not shining, of the same colour on both sides; venation finely marked, oblique, spreading, intramarginal vein removed from the edge. Peduncles axillary, 3 to 4 lines long, slightly compressed, bearing a few flowers. Calyx tube hemispherical to pyriform, 1 line long, on a pedicel of equal length; operculum hemispherical, shortly acuminate.

Fruit. - Shortly pedicellate, hemispherical to slightly pear-shaped; rim thick, convex, having a groove below the edge; valves generally our, exserted, under 1 line long; 2 lines in diameter and 2 to 3 lines long.

The fruits are much like a small E. viminalis or E. Bridgesiana, but are quite different from those of E. Stuartiana, which have a sloping rim.

Habitat. - Colombo, Towrang, New South Wales.

REMARKS. - The herbarium material of this species is so similar to that of E. Bridgesiana that on a first examination it might be included with that species. Field observations, however, have shown that the two trees are quite distinct and should not be included under the same name. E. Bridgesiana is known vernacularly as "Apple" and "Woollybutt," but this tree as "Apple-top Box." The bark is that of a true "Box," but the timber is quite unlike that of a "Box." The bark has not an essential oil as obtains in E. Bridgesiana. Although it has a regular light-coloured grey "Box" bark, yet the appearance of the foliage in the field is more like that of an "Apple-tree" (Angophora), hence the local name of "Apple-top Box."

ESSENTIAL OIL. - Leaves and terminal branchlets for distillation were obtained from Towrang, N.S.W., in October, 1900. The yield of oil was 0.9 per cent. The crude oil was red in colour, and contained rather a large amount of phellandrene, to which constituent the 1ævo-rotation of the oil was due. Pinene was determined, and also cineol. It also contained a somewhat large amount of sesquiterpene. The constituents in the oil of this Eucalypt differ greatly from those in the oil of E. Bridgesiana, as can be seen by referring to that species.

The crude oil had specific gravity at 150 C. = 0.049; rotation aD - 11.°; refractive index at 200 = 1.824, and was soluble in 1 volume 80 per cent.alcohol. The saponification number for the esters and free acid was 7..

On rectification, 1 per cent.distilled below 1650 C. (corr.). Between 165-1830, 70 per cent.distilled; between 183-2450, 2 per cent.came over, and between 245-2700, 20 per cent.istilled. The third fraction consisted largely of the sesquiterpene. The fractions gave the following results: -

The cineol, determined by the phosphoric acid method in the first fraction, was 26 per cent., indicating about 18 per cent. in the crude oil (O.M.)

This sample was stored in the dark, and in December, 1919, was again analysed. The oil had altered somewhat during the nineteen years it had been kept, and the phellandrene had suffered considerable loss in optical activity; it had otherwise changed, so that only 52 per cent, distilled below 1900 C. There was apparently no increase in the amount of cineol. The crude oil and the rectified portion gave the following results: -

The cineol was determined by the resorcinol method in the rectified portion; when calculated for the crude oil, the result was 27 per cent.