53 



that period. Between 156-162, 60 per cent, distilled, and between 162-172 

 25 cent, came over. The crude oil and the two fractions gave the following 

 results : 



Crude oil, sp. gr. at 15 C. == 0-8840; rotation a D + 31-0; refractive index 



at 20 = 1-4689. 

 ,, ,, = 0-8670; rotation a D + 31-25; refractive index 



at 20 = 1-4651. 

 ,, ,, = 0-8741; rotation a + 29-80; refractive index 



at 20 = 1-4658. 



The cineol was determined by the resorcinol method in the oil distilling 

 below 172. When calculated for the crude oil the result was 6 per cent. The 

 saponification number for the esters and free acid in the crude oil was 17-7. In 

 the cold, with two hours' contact, it was 12 ; after acetylating, the saponification 

 number had increased to 41-3, and in the cold with two hours' contact it was 

 22, thus showing the presence of some free geraniol. 



For further investigation of the terpene, see the article on the "Pinenes 

 of Eucalyptus Oils." For the corresponding laevo-rotatory pinene see under 

 E. Icevopinea. 



First fraction, 

 Second 



18. Eucalyptus nigra. 



(R.T.B., Proc. Linn. Soc., N.S.W., 1900, p. 689.) 

 Black Stringybark. 



Systematic. A tall tree, with a black stringy bark. Abnormal leaves 

 opposite or alternate, thin ovate, acuminate, shortly petiolate ; pale on underside, 

 branchlets covered with stellate hairs. Normal leaves lanceolate, scarcely falcate, 

 occasionally oblique, mostly under 4 inches long and under i inch wide, of a 

 dull green colour ; venation only faintly marked on the upper surface, but very 

 distinctly so on the lower, lateral veins oblique, distinct, intramarginal vein 

 removed from the edge. Peduncles axillary, short, under 4 lines, bearing a cluster 

 of from eight to twelve flowers. Calyx hemispherical, under 2 lines in diameter, 

 on a short pedicel ; operculum hemispherical, acuminate, about ij lines long 

 when mature. Ovary flat-topped. Anthers very small, filaments very slender. 



Fruit. On thick, angled pedicels, hemispherical to 

 pilular ; rim variable, thin, or truncate, and 

 even domed occasionally ; valves slightly 

 exserted ; about 4 lines in diameter. 



The fruits are very much like those of E. cugenioidcs. 



Habitat. Richmond River district, Cook's River, Sydney, 

 Blackheath, New South Wales. 



Timber. Of a dark brown colour (hence the specific name), comparative 

 only with other " Stringybarks," occasionally affected with borers, and not 

 valued for durability by those interested in the timber trade. 



