(J.H.M., in Forest Flora, N.S.W., Vol. VII, pt. 4.) A Mountain or White Gum.

Systematic. - A large tree up to 30 feet in girth, with a smooth bark, white in spring, and later becoming red, the whole trunk having a blotched appearance. Abnormal leaves scabrous when young, cordate to orbicular or ovate, stem clasping, sessile or very shortly petiolate, often mucronate, averaging 2 inches long and 2 inches broad. Normal leaves lanceolate, sometimes falcate, usually over 4 inches long and 9 lines wide; venation fairly prominent, intramarginal vein not far removed from the edge, lateral veins distant, more or less parallel, inclined at an angle of 35-400 to the mid-rib. Peduncles usually axillary, somewhat flattened, 3 lines long, each with an umbel of three flowers. Buds shortly pedicellate; calyx tube cylindroid, 1 1/2 lines long; operculum semi-ovoid, as long or slightly longer than the tube.

Fruit. - Semi-ovoid, almost sessile; rim domed; valves thick, well exserted; 3 lines long and 3 lines in diameter.

They are uncommonly like E. viminalis. so that these two cannot be separated by the fruit alone.

Habitat. - Yarrangobilly, Batlow, Tumbarumba and mountainous country of south-east New South Wales; probably extending into Gippsland, Victoria,

70 Eucalyptus Dalrympleana 108

ESSENTIAL OIL.-Leaves and terminal branchlets for distillation Wert procured from Laurel Hill, near Batlow, New South Wales, in May, 1916. The material consisted wholly of the mature lanceolate leaves. The yield of oil was 0.15 per cent. The crude oil was of an amber colour, and had an odour similar to those of the cineol-pinene group generally. Cineol was present in some quantity. The chief terpene was pinene, and phellandrene was absent. A small quantity of the sesquiterpene was detected, but esters were not pronounced.

The crude oil had specific gravity at 150 C. = 0.9145; rotation aD + 4.6°; refractive index at 200 = 1.4645, and was soluble in 1 3/4 volumes 70 per cent. alcohol. The saponification number for the esters and free acid was 8.5.

On rectification 2 per cent. distilled below 1620 C. (corr.). Between 162-1720, 27 per cent. distilled; between 172-1920, 60 per cent. came over, leaving 11 per cent. as residue. The fractions gave the following results: -

First fraction, sp. gr. at 150 C.

=

0.9085; rotation aD + 7.2°; refractive index at 200 = 1.4616.

Second

"

"

=

0.9149; rotation aD + 3.6°; refractive index at 200 = 1.4630.

The cineol, determined by the phosphonc acid method in the crude oil, was 50 per cent.

In March, 1899, materal for distillation was received from Bungendore, New South Wales. The trees from which it had been collected bore some resemblance to E. rubida, but as the results did not agree with those for that species, the data we obtained were omitted in the first edition of this work. Now that the same tree has been located at Laurel Hill, and named, the previous results fall into line, and are here recorded. It is thus seen that E. Dalrympleana has quite an extensive range. The material consisted largely of abnormal leaves, consequently the yield of oil was larger than with the above, which was distilled from normal leaves, otherwise the oil was quite in agreement with it in all respects.

The yield of oil was 0.8 per cent. The crude oil had specific gravity at 150 C. = 0.9133; rotaticn aD + 6.7°; refractive index at 200 = 1.4639, and was soluble in 2 volumes 70 per cent, alcohol. The saponification number for the esters and free acid was 7.8.

On rectification 2 per cent, distilled below 1680 C. (corr.). Between 168-1830, 84 per cents distilled; between 183-2450, 7 per cent. came over, and between 245-2650, 4 per cent. distilled. These fractions gave the following results: -

First fraction, sp. gr. at 15o C.

=

0.9105;

rotation aD

+

7.6o.

Second

"

"

=

0.9198;

"

+

1.9°.

Third

"

"

=

0.9354;

"

not taken.

The cineol determined by the phosphoric acid method was 50 per cent, in the crude oil (O.M.).

It is thus seen that the oil of this species contains much more cineol than does that of E. rubida, and that phellandrene is absent, consequently it has a higher rotation to the right, and is much more soluble in alcohol.