126 



rule in this respect. The principal constituents in the oil were dextro-rotatory 

 pinene and cineol, over 50 per cent, of the latter constituent being present. 

 Phellandrene does not occur, nor were either eudesmol, piperitone, or aromaden- 

 dral detected. The ester was probably geranyl-acetate largely, as the greater 

 portion was saponified in the cold with two hours' contact. The small amount 

 of high-boiling constituents in the oil of this species caused it to have a 

 specific gravity below 0-91 at 15 C., while the presence of the pinene in rather 

 large excess gave a somewhat high dextro-rotation. The rectified oil, however, 

 was practically colourless almost water-white -and it had, for an ordinary 

 Eucalyptus oil, a very agreeable odour, and nothing objectionable. The yield of 

 oil from leaves with terminal branchlets was 1-13 per cent. The crude oil was 

 reddish in colour, usual with oils of this class when the leaves are distilled from 

 iron digesters. The specific gravity at 15 C. = 0-9088; rotation a a + 11-8; 

 refractive index at 20 C. = 1-4652, and was soluble in 5 volumes 70 per cent, 

 alcohol. 



On rectification, a small amount of acid water and volatile aldehydes, 

 for oils of this class, came over below 165 C. (corr.). Between 165-174, 

 54 per cent, distilled ; between 174-193. 36 per cent. ; the thermometer then 

 quickly rose to 230, and between that temperature and 246, 5 per cent, 

 distilled. These fractions gave the following results : 



First fraction, sp. gr. at 15 C. = 0-9001 ; rotation a a + 15-7; refractive 



index at 20 = 1-4613. 

 Second ,, ,, ,, =0-9165; rotation a D + 6-4; refractive 



index at 20 = 1-4616. 



Third ,, ,, ,, = 0-9258 ; rotation not taken ; refractive 



index at 20 = 1-4850. 



The cineol was determined by the resorcinol method in the oil distilling 

 below 193 ; the result was 63 per cent, when calculated lor the crude oil. By the 

 rapid phosphoric acid method it was 53 per cent, when calculated for the crude 

 oil. 



The saponification number for the esters and free acid was 18-3. In the 

 cold with two hours' contact, it was 10-7, equal to 3-7 per cent, of geranyl- 

 acetate when calculated for that ester. 



A portion of the crude oil was rectified by steam. The product was almost 

 colourless, and the odour good, whilst but little residue remained. The oil thus 

 rectified had specific gravity at 15 C. = 0-9071 ; rotation a D + 12-1; refractive 

 index at 20 = 1-4621. 



The results of this investigation were published by us in the Proc. Roy, 

 Soc., Tasmania, October, 1912. 



66. Eucalyptus unialata. 



(R.T.B. & H.G.S., in Roy. Soc. Tas., 1912, p. 176, t. I.) 



Systematic. A tree reaching 30 to 40 feet in height, with a bark flaky 

 at the butt and smooth above. Abnormal leaves sessile, the lower pairs oval, 

 then cordate, acuminate, up to 3 inches long and i| inch wide to narrow 

 lanceolate. Normal leaves lanceolate, falcate, up to 9 inches long and i inch 

 wide, sub-coriaceous, occasionally shining on the upper surface; intramarginal 

 yein slightly removed from the edge, venation distinct, lateral veins fairly oblique. 



