6 7 



ESSENTIAL OIL. Material consisting of leaves and terminal branchlets 

 for distillation was collected at the Kingscote end of Kangaroo Island, in June, 

 1911. The yield of oil was 0-41 per cent. The crude oil was of a lemon-yellow 

 colour and had a terpene-like odour, which almost entirely masked that of the 

 small amount of cineol. Although chiefly a terpene oil, and highly hevo-rotatory, 

 yet phellandrene was absent. The oil also contained nearly 20 per cent, of 

 sesquiterpene. The crude oil had specific gravity at 15 C. :: 0-884; rotation 

 a n ~ 37'7; refractive index at 20 = 1-4736, and required 8 volumes 80 per 

 cent, alcohol to form a clear solution. The saponifkation number for the esters 

 and free acid was 4-9. 



On rectification, a few drops of acid water and volatile aldehydes came 

 over below 168 C. (corr.V Between 168-175, 3^ per cent, distilled; between 

 175-200, 39 per cent, came over; and between 260-275, 17 per cent, distilled. 

 These fractions gave the following results : 



First fraction, sp. gr. at 15 C. 0-8674; rotation a u - 38-6; refractive 



index at 20 1-4670. 

 Second ,, ,, ,, = 0-8701; rotation a u - 52-2; refractive 



index at 20 1-4691. 

 Third ,. ,, ,, = 0-9295; rotation not taken; refractive 



index at 20 = 1-4963. 



The cineol was determined by the resorcinol method in the portion 

 distilling below 200 C. ; the result was 12 per cent, when calculated for the crude 

 oil. 



The oil was thus shown to consist largely of terpenes, so that redistillation 

 of the two first fractions was undertaken. 3 per cent, of the first fraction was 

 removed, boiling below 162; the second fraction was then added, and the 

 whole fractionated in order to further separate the lower-boiling terpenes. 

 Between 162-172, 34 per cent, distilled (= second fraction); between 172-175, 

 16 per cent, distilled. These fractions gave the following results : 



First fraction, sp. gr. at 15 C. = 0-8597 ; rotation D - - 29-6 ; refractive 



index at 20 -- 1-4673. 

 Second ,, ,, ,, - 0-8574; rotation a D - - 48-0; refractive 



index at 20 = 1-4693. 

 Third ,, ,, ,, = 0-8574; rotation a - 65-6; refractive 



index at 20 1-4711. 



These results suggest that as phellandrene was absent the principal terpene 

 in the oil of this species was Isevo-rotatory limonene, and that pinene was only 

 present in small quantity. Although the constants are those suggestive of 

 limonene, yet the characteristic tetrabromide was not at all satisfactorily 

 prepared. For industrial purposes the essential oil of this Eucalyptus has little 

 commercial value at present. 



The results obtained with the oil of this species were published by us in 

 the Trans. Roy. Soc., South Australia, 1916. 



