n6 



REMARKS. A species endemic to Tasmania, with specific characters distinct from any of the mainland 

 Eucalypts, although Maiden synonymised it in Roy. Soc. Tas., 1914, p. 30, under E. aggregata, D. & M., but our 

 results for this species do not agree with the physical and chemical properties described under that species, any 

 more than th^y do wh;n it was considered to be E. Macarthuri. 



ESSENTIAL OIL. Material of this species for distillation \vas collected 

 at Deloraine, Tasmania, in June, 1912. The crude oil when cleared was light 

 olive-brown in colour, and had a terpene-like odour, together with that of cineol, 

 but with no resemblance to geranyl-acetate. It contained pinene as the chief 

 terpene, and phellandrene could not be detected. It was rich in cineol, 

 over 60 per cent, of the crude oil being that constituent. The saponification 

 number for the esters and free acid was only 3-96, representing 1-38 per cent, of 

 ester if calculated as geranyl-acetate. The amount of ester in the oil of this 

 species is thus low. The yield of oil was 0-48 per cent., too small an amount 

 to render the oil of commercial value. 



The crude oil had specific gravity at 15 C. = 0-9075 ; rotation + 

 10-6; refractive index at 20 = 1-4671; and was soluble in 6 volumes 70 per 

 cent, alcohol. 



On rectification, the usual amount of acid water and volatile aldehydes 

 were obtained below 164 C. (corr.), at which temperature the oil commenced to 

 distil. Between 164-173, 33 per cent, distilled; between 173-198, 57 per cent, 

 came over, and between 198-265, 5 per cent, distilled. The high-boiling 

 fraction contained a constituent with rotation to the right, but it was not 

 isolated. It was apparently the liquid form of eudesmol. The following results 

 were obtained with the several fractions : 



First fraction, sp. gr. at 15 C. = 0-8979; rotation a D + 15-8; refractive 



index at 20 = 1-4611. 

 Second ,, ,, ,, = 0-9119; rotation a D + 8-4; refractive 



index at 20 = 1-4620. 



Third ,, ,, ,, = 0-9231; rotation D -t-5-2; refractive 



index at 20 = 1-4787. 



The cineol, determined by the resorcinol method in the oil distilling below 

 198 C., and calculated for the crude oil, was 64 per cent. By the rapid phosphoric 

 acid method the result was 50 per cent., when calculated for the crude oil. After 

 acetylation the saponification number was 24-5, thus showing the presence of 

 bodies, other than alcohols, absorbable by resorcinol. The rectified oil had a 

 yellowish tinge, a peculiarity often found with the cineol-pinene oils distilled 

 from the leaves of the smooth bark "Gums" like E. globulus, E. goniocalyx, &c. 

 Pinene was isolated from the first fraction, and proved to be that substance by 

 the formation of the nitrosochloride, which melted at the correct temperature for 

 that substance. 



This species has no close connection with E. Macarthuri of New South 

 Wales, as the oil of that species appears never to contain less than 60 per cent, of 

 geranyl-acetate at any time of the year, the ester often rising to 75 per cent., and 

 one determination of the oil from the abnormal leaves showed that it contained 

 over 77 per cent, of geranyl-acetate. Cineol does not appear to occur in the oil 

 of E. Macarthim, although pinene is usually present in small amount. 



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

 Soc., Tasmania, October, 1912. 



