261 



The above sample was stored in the dark, and in December, 1919, was again 

 analysed. Very little alteration had taken place in the oil during the twenty-two 

 years it had been kept, and evidently constituents prone to alteration are practi- 

 cally absent in the oil of this species. There was apparently no increase in cineol. 

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

 the following results : 



Crude oil, sp. gr. at 15 C. = 0-9197; rotation a + 5-0; refractive index 



at 20 = 1-4775. 

 Rectified portion ,, = 0-8996; rotation a D + 5-4 ; refractive index 



at 20 = 1-4654. 



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

 when calculated for the crude oil the result was 32 per cent. By the rapid 

 phosphoric acid method, the result was 26 per cent, when calculated for the 

 crude oil. 



141. Eucalyptus acmenioides. 



(Schau., in Walp. Rep., ii, 924.) 

 White Mahogany. 



Systematic. A tall tree, with a lightish-coloured stringy bark. Leaves 

 lanceolate, thin, mostly about 4 inches long and i inch wide, dark green on the 

 upper surface, pale underneath, sometimes shining ; venation distinct, in relief 

 on the under surface of leaf, lateral veins oblique, parallel or spreading, intra- 

 marginal vein removed from the edges. Flowers axillary, peduncles flattened, 

 about six in each umbel ; pedicels about 3 lines long, angled. Calyx tube tur- 

 binate, about 2 lines in diameter, and 2 lines long ; operculum acuminate, shorter 

 than the calyx. 



Fruit. Pedicellate, hemispherical ; rim usually 



thin, slightly sunk ; valves not ex- 



serted, the cells very distinct ; 3 lines 



in diameter. 



The nearest fruits in shape to these are (when 

 immature) E. umbra [i], next E. Bosistoana, 

 E. melliodora and E. carnea. 



Habitat. Coast district, New South Wales ; Queensland. 



REMARKS. This is a distinct species, but care must be taken in the herbarium not to confuse it with E. 

 carnea ami E. umbra, R.T.B., as the early fruits of these species greatly resemble each other. These latter species 

 differ from it in (i) young state leaves, (2) their normal leaves being coarse and thick, and with a uniform greyish 

 colour on both sides, (3) the mature fruits having a thick rim, whilst the timber and oils of all threeare also distinct 

 These species preserve a constancy of specific characters throughout their geographical range. 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation were 

 obtained from Lismore, N.S.W., in August, 1900. The yield of oil was small, 

 only 8| oz. being obtained from 594 Ib. of leaves ; equal to 0-09 per cent. The 



