483 



It is, perhaps, more largely cultivated abroad than any 

 any other species except E . globulus. Its specific characters 

 appear not to vary wherever the tree is exotically grown. 



The oil from the variety borealis of this species ("Re- 

 search on the Eucalypts," p. 75) differs entirely from that of 

 E. rostrata, but in itself is just as constant. We have now 

 had material of this variety from several localities, recently 

 from Victoria, and the oil from all these is in agreement. 

 There are thus two distinct forms of E . rostrata, and it is our 

 intention to eventually raise the variety borealis to specific 

 rank. 



Essential Oil. 



Leaves and terminal branchlets of this species for distil- 

 lation were collected at the Kingscote end of Kangaroo Island 

 in the month of June. 



The average jieUd of oil was 0*38 per cent. The crude 

 oil was dark coloured — due to the influence of the phenols — 

 and had a strong secondary odour of aromadendral. Cineol 

 was present, but in small amount, and a small quantity of 

 phellandrene was detected ; cymene was present in some quan- 

 tity. The oil from this material gave results which were in 

 entire agreement with those published by us in 1902" for this 

 species ("Research on the Eucalypts," p. 139), from material 

 collected at Albury and at Hay, New South Wales localities. 



The crude oil of the Kangaroo Island E. rostrata had 

 specific gravity at 15° C. = 0*9047 ; rotation, a D _i2-4°; 

 rafractive index at 20° — 1*4890, and was soluble in one 

 volume 80 per cent, alcohol. The saponification number of 

 the esters and free acid was 6*1. On rectification a few drops 

 of acid water and some aldehydes came over below 173° 

 (corr.). Between 173-188°, 51 per cent, distilled; between 

 188-255°, 30 per cent, came over, and between 255-272°, 7 

 per cent, distilled. These fractions gave the following 

 results : — 



Sp. gr, at 15 c C. 



First fraction 

 Second fraction 

 Third fraction 



0-8710 

 0*9127 

 0-9333 



Rotation a.j> 



- 7"o c 

 -21-2 C 



Ref. index at 20°. 



1*4811 



1-4929 

 1-5040 



The left rotation of the first fraction is partly due to the 

 phellandrene, while that of the second fraction is almoist 

 entirely owing to the aromadendral. The high refractive 

 Q2 



