"7 



ESSENTIAL OIL. Material consisting of leaves and terminal branch! 

 [or distillation was i olle< ted .it the Kingsi ote end oi Kangaroo [sland, in June, 

 [on. 1'hr yield oi oil was o- |i per i ent. The crude oil was oi .1 lemon-yellow 

 colour and had .1 terpene-like odour, which almost entirely masked thai oi the 

 small amounl oi cineol. Although chiefly a terpene oil, and highly laevo-rotatorj . 

 yel phellandrene was absent, rhe oil also contained nearly 20 per cent. "1 

 sesquiterpene. The crude oil had specific gravity at 13 1 0-884; rotation 



- ; refractive index at 20 1 , md required 8 volumes 80 per 



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

 and free a< id was po. 



On rectification, a few drops oi acid wain aid volatile aldehydes came 

 over below t68 C. (corr.). Between 168-175 , 38 per cent, distilled; between 

 r.75 200 , 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 38-6°; refractive 



index at 20 = 1-4670. 

 Second „ ,, „ =0-8701; rotation a 5---"; 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 \\ as 12 per cent . when 1 alculab d 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 i(>2°; 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°, 

 e6 per cent, distilled. These fractions gave the following results ; 



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



index at 20 = 1-4673. 

 Second ,, „ „ =0-857-1; rotation a D 48-0°; refractive 



index at 20 = 1-4693. 

 Third ,, ,, ,, = 0*8574; rotation a D 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 laevo-rotatory limonene, and that pinene was only 

 present in small quantity. Although the constants .ire those suggestive oi 

 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 oi this species were published by us in 

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



