chief constituents were dextro-rotatory pinene, laevo-rotatory phellandrene, 

 cineol, geranyl-acetate, free geraniol, together with .1 small amounl oi an undeter 

 mined alcohol, .ind 11- ester, and also a solid paraffin-Uke stearoptene. A 

 substance ol such a charactei had nol previously been recorded for Eucalyptus 

 oils; it 1- not, however, peculiar to this species, for it has alreadj been found in 

 the oils "i some New South Wales Eucalypts. It mosl probabhj belongs to 

 the I II +-2 group, as it is saturated. This solid aliphatii stearoptene is 

 related to .1 similar substance found in Rose oil, although melting at a higher 

 temperature, and it is remarkable thai the principal alcohol in both Rose oil and 

 in the oil "i this Eucalypl is geraniol. The oil ol E. Macarthuri, however, does 

 nut contain it. similar paraffins, with varying melting points, have been isolated 

 from thf oils of a tew other plants, and in some case- from the oils ol their leaves. 

 l'he stearoptene from E. aceroula is without doubt from the oil oi the leaves, 

 because the tree- were not in flower at this time ol the year. 



The oil of E. acervula does not agree entirely in general characters with 

 that of E. paludosa ol New South Wales, as the former contains a small quantity 

 ol phellandrene and not much pinene, while the principal terpene in the oil 

 of E. paludosa is pinene, and phellandrene appears to be absent. The esters, 

 too, were not identical in composition. They both contained, however, about 

 the same amount of cineol, and the paraffin stearoptene was also found in both, 

 hut in much smaller quantity in the oil of /:'. paludosa. The two species may, 

 therefore, he considered as closely related. 



The specific gravity of the crude oil at 15 C. = 0-8956 ; rotation a B -- i-i°; 

 refractive index at 20 = 1-4747, and it was soluble in 1 volume 80 per cent. 

 alcohol, but became turbid with ) volumes, and remained turbid with further 

 addition of alcohol in the cold, forming a flocculent precipitate on standing. On 

 heating the solution it became clear, but the paraffin was deposited again on 

 cooling. 



The saponification number for the esters and free acid was ;_>-,x by boiling, 

 and 21-4 in the cold with two hours' contact ; this represents 7-5 per cent, of geranyl- 

 acetate in the crude oil, and 4 per cent, of another ester if calculated for an alcohol 

 having a similar molecular weight. The odour of geraniol in the separated oil, 

 alter saponification, was very pronounced, and although the amount of oil at 

 our disposal did not permit of its separation and purification, yet there is no 

 doubt as to its identity, particularly as geraniol and geranyl-acetate are such 

 common constituents in certain classes of Eucalyptus oils. 



The amount of tree geraniol in the oil was considerable, and another 

 undetermined alcohol was also present. A portion ol the crude oil was acetylated 

 by boiling with acetic anhydride and anhydrous sodium-acetate in the usual 

 manner; the separated oil was mobile, and had an odour of geranyl-acetate. 

 'I'he saponification number lor this esterised oil by boiling was 105-3, a,1( l ni 

 the (did with two hours' contact, 69-5. This latter figure represents 24-3 

 per cent, of ester as geranyl-acetate, and indicates that 13-2 per cent, of free 

 geraniol was present in the oil, as well as (>•<> per cent, of another alcohol, assumed 

 to have the same molecular weight. 



It is worthy ol notice that over 50 years ago, when this species was de- 

 scribed by Hooker in his "Flora tasmaniae," he remarked that 'The bruised 

 foliage has a much sweeter odour than is usual in the Genus." The discovery of 

 geraniol and its ester in the oil not onl\ confirms this remark, but also indicates 

 the constant character of the chemical constituents. 



'l'he acid in the original ester was separated and found t" he almost entirely 

 ai etic. 



