492 



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 yield of oil was very small, only three ounces being 

 obtained from 194 lb. of material, equal to 0'096 per cent. 

 The crude oil was of an orange-brown colour, and the odour 

 resembled that' of an oil belonging to the cineol-pinene group. 

 The secondary odour was indefinite. Phellandrene does not 

 occur in the oil of this species. The crude oil had specific 

 gravity at 15 c C. =0'8945; rotation, a D + 8*l c ; refractive 

 index at 20° = 1*4779, and was soluble in 4 volumes of 80 

 per cent, alcohol. The saponification number for the esters 

 and free acids was 7*7. 



On rectification a few drops of acid water, with some 

 aldehydes, came over below 159° C. (corr.). Between 159- 

 167° 28 per cent, distilled, and between 167-205° 53 per- 

 cent, came over; the residue thus represented 19 per cent. 

 As the amount of available oil was small, less than half the' 

 usual quantity was available for distillation. These fractions 

 gave the following results: — 



First fraction 

 Second fraction 

 Residue 



Sp. gr. at 15° C. Eolation a D : R e f. index at 20°. 



0-8718 +20-9° , 1-4670 



0-881(5 +11-1° 1-4738 



0*9548 1-5007 



The cineol was determined by the resorcinal method in- 

 the rectified oil, and when calculated for the crude oil the 

 result showed that 20 per cent, of that constituent was pre- 

 sent. The oil of this species thus shows strong resemblance- 

 to those distilled from E. microcorys and E. maculata. The- 

 chief terpen e is dextrorotatory pinene. The species has little 

 value as an oil-producing Eucalypt. 



31. Eucalyptus obliqua, L'Her. 



"Stringy Bark." 



This widely-known species of the Eastern States extends 

 to South Australia, and along with E. cajdtellata and E . 

 macrorhyncha is the most common species in the ranges of 

 the South-east, extending across to Kangaroo Island. 



It is botanically and chemically described in our work on 



