233 



On rectification, 2 per cent, distilled below 167 C. (corr.). Between 

 167-183, 78 per cent, distilled; between 183-234, n per cent, came over, and 

 between 234-255, 4 per cent, distilled. These . fractions gave the following 

 results : 



First fraction, sp. gr. at 15 C. == 0-8882; rotation a a --- 7-3. 

 Second ,, ,, =0-9148; ,, a D 8-5. 



Third ,, ,, = 0-9377; ,, not taken. 



These figures indicate that this " Mallee " is closely associated with the 

 group of typical " Boxes," as E. hemiphloia. 



This sample of oil had been stored in the dark, and in September, 1919, was 

 again analysed. Some alteration is apparent, such as a diminution in the optical 

 activity, a slight increase in specific gravity, and perhaps a slight increase in cineol. 

 80 per cent, distilled below 190 C. The crude oil and the rectified portion gave 

 the following results : 



Crude oil, sp. gr. at 15 C. = 0-9070; rotation a D - - 2-8; refractive index 



at 20 ; 1-4769. 

 Rectified portion ,, = 0-8942; rotation a a - - 6-6; refractive index 



at 20 = 1-4699. 



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

 when calculated for the crude oil the result was 38 per cent. A qualitative 

 determination with phosphoric acid indicated about 10 to 15 per cent, of cineol in 

 the fraction, or about 12 per cent, in the original oil. A considerable amount of 

 constituents, other than cineol, were thus absorbed by the resorcinol, and this 

 result appears to be characteristic with oils of this group. 



124. Eucalyptus uncinata. 



(Turcz., in Bull. Mosc., 1849, ii, 23, Syn. E. leptophylla, Miq.) 



A Mallee. 



Systematic. A tall shrub, with several thin stems, branched from near the 

 base, with a smooth, red, or ashy-grey bark, coming off in thick flakes, branches 

 erect. Leaves narrow-lanceolate, about 3 inches long, under \ inch wide, light 

 green in colour, somewhat shining, generally terminated by a short, narrow, hooked 

 apex, from which the specific name is, in this instance, derived, conspicuously 

 black-dotted, especially underneath. Peduncles mostly in the axils of the leaves, 

 each bearing an umbel of about six to eight small flowers ; operculum obtusely 

 conical or acuminate, occasionally of a reddish colour. 



Fruit. Small, globular, or pear-shaped, more or 

 less shining ; rim comparatively broad, 

 sometimes countersunk; valves thin, acu- 

 minate, tips just exserted ; 2 to 3 lines long 

 and up to 2 lines in diameter. 



E. odorata and E. Behriaru more closely match these 

 than any other. 



Habitat. Far interior of New South Wales ; Western Australia ; 

 South Australia; Victoria. 



50068 Q 



