(R.H.C., Proc. Roy. Soc, N.S.W., 1918, p. 453.)

Systematic. - A tall shrub, "Mallee" like, reaching 15 to 20 feet in height. Branchlets angular at extremities. Abnormal leaves ovate to ovate-lanceolate. Normal leaves lanceolate, falcate, to ovate-lanceolate, acuminate; venation fairly prominent, intramarginal vein close to the edge of the leaf, lateral veins inclined at about 400 to the mid-rib. Flowers about six in umbel, the common peduncle axillary or lateral, about 5 lines long. Buds almost sessile; calyx tube conoidal, 2 lines long, and half as long as the blunt pointed conical operculum.

Fruit. - Hemispherical to turbinate, rough, somewhat shining; rim thick, convex; valves thick, usually four, well exserted; 3 lines long and 3 to 4 lines in diameter.

Amongst other species the nearest in shape to these are E. dealbata and E. tereticornis.

Habitat. - Near Pokolbin, New South Wales.

Plate XXXVILl.

Eucalyptus Pumila. r.h.c

Plate XXXVII.

W. Marshall, del.

Eucalyptus Pumila, R.H.C

ESSENTIAL OIL. - Leaves and terminal branchlets for distillation were obtained from near Pokolbin, N.S.W., in August, 1907. The yield of oil was 1.6 per cent.

The oil from this species is one of the best of the cineol-pinene class of Eucalyptus oils, and compares favourably with those from E. polybractea, E. Smithii, and others. As it grows in the "Mallee" form the leaves would not be difficult to collect, and if occurring in quantity should be profitable for oil distillation. The rectified oil was slightly tinged yellow, as are practically all the rectified oils of this class. Cineol was the chief constituent, three-quarters of the oil consisting of that substance. Pinene was present, but phellandrene was absent. Although the pinene was dextro-rotatory, yet that form only slightly predominated, consequently the rotations for the crude and rectified oils were almost the same. The lower boiling aldehydes, butaldehyde and valeralde-hyde, were present, as is usual with oils of the cineol-pinene class. The higher boiling portion contained some sesquiterpene, and it is probable that aromaden-dral was also present in small amount.

The crude oil had specific gravity at 150 C. = 0.9237; rotation aD + 2.3°; refractive index at 200 = 1.4683, and was soluble in 1.1 volumes 70 per cent. alcohol. The saponification number for the esters and free acid was 3.2.

On rectification the usual amount of acid water and volatile aldehydes came over below 1670 C. (corr.). Between 167-1830, 89 per cent. distilled, and between 183-2500, 8 per cent. distilled. These fractions gave the following results: -

The cineol was determined by the phosphoric acid method; the result was 74 per cent. of that constituent in the crude oil.