253 



oi sesquiterpene, rhe constituents in the oil oi this Eucalypl difl itly from 



those in the oil of E. Bridgesiana, a can be seen l>\ referring to thai species. 



The crude oil had specific gravity a1 15 C. 0*9049; rotation - 11*5 , 

 refrai tive index a1 20 1 ■ |> ■ \. and was soluble in 1 volume 81 1 pei cent, alcohol. 

 The saponification number foi the esters and free a< id was 7-3. 



(hi rectification, 1 per cent, distilled below [65 C. (corr.). Betwi 

 [65 [83 . 70 per cenl distilled; between r.83 245 2 per cent, came over, and 

 between 245 270 . 20 pei cent, distilled. The third fraction consisted largely of 

 the sesquiterpene. rhe fractions gave the following results: 



First fraction, sp. gr. a1 15 C. = o-NNN(> ; rotation a B _>i-i - 

 I bird ,. .. .. = 0-9392 ; ,, ao1 taken. 



The cineol, determined l>\ the phosphoric a< id mi thod in the first fraction, 

 was 26 per cent., indicating about r.8 pei cent, in the crude oil (O.M 



This sample was stored in the dark, and in December, [919, was again 

 analysed. The oil had altered somewhat during the nineteen years it had been 

 kept, and the phellandrene had suffered considerable 1<»>> in optical activity; it 

 had otherwise changed, so that only 52 per cent, distilled below [90 C. There 

 was apparently no increase in the amount oi cineol. The crude oil and the 

 rei tified portion gave the following results : 



Crude oil, sp. gr. at 15 C. = 0-9251; rotation a„ -2 ; refractive index 



at 20 = 1-4^25. 

 Rectified portion ,, =0-8947; rotation a B - (1-4 ; refractive index 



at 20 = 1-4678. 

 The cineol was determined by the resorcinol method in the rectified portion; 

 when calculated for the crude oil, the result was 2J per cent. 



136. Eucalyptus microtheca. 



(F.v.M., m Journ. Linn. Soc, iii, S7.) 

 Coolabah or Tangoon. 



Systematic — A tree attaining a height of So feet, and a stem diameter of 

 j feet (H. K. Bennett). Bark rough, more or less dark or ashj -rev outside, 

 sometimes persistent, but occasionally smooth (F.v.M.). Leaves lanceolate, falcate, 

 always drying a light slate colour, oblique, measuring sometimes up to 8 or 

 9 inches in length and | inch in width, on a. petiole oi 1 inch or 1 \ inch long; 

 venation lanh prominent, intramarginal one not far removed from the edge. 

 Mower- mostly in terminal panicles. Calyx tube small, almost hemispherical; 

 operculum conical, acuminate. 



Fruit. Small, hemispherical, on a slender pedicel; 

 rim thin; valves expanded and much 

 exserted and convex; under 2 lines m dia- 

 metei 

 / hese fruits stand alone as regards tln-ir sluipt-. 



Habitat. From Narrabri to the deserts oi the north-wesl of 

 New South Wales; South Australia; Queensland; 

 North Australia 



