53 



thai period. Between [56 [62 60 pei cent, distilled, and between 162 172 4 

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

 1 esults : 



Crude oil, sp. gr. al 15 C. 0-8840; rotation a D 4- 310 ; refractive index 



.11 20° — 1 -4' > 



First fraction = 0-8670; rotation «„ 4- 3125 ; refractive index 



at _'<> 1 ■ I.651. 



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



.It Jo [-4658. 



The rin.nl was determined by the resorcinol method in the <>il distilling 

 below 172 . When calculated for the crude oil the resull was 6 per cent. ttie 

 saponification number for the esters and free acid in the crude oil was 177. 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' contacl it was 

 22, thus showing the presence ol some free geraniol. 



For further investigation oi the terpene, see the article on the "Pinen.es 

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

 E. Icevopinea. 



18. Eucalyptus nigra. 



R II',. Proc. Linn. Soc., N.S.W., [91 0, p. 689.) 

 Black Stringybark. 



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

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

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

 occasionally oblique, mostly under 4 inches long and tinder 1 inch wide, of a 

 dull green colour; venation only faintly marked on the upper surface, bu1 very 

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

 removed from the edge. Peduncles axillary, short , tinder 4 lines, bearing a clust( r 

 of from eighl to twelve flowers. Calyx hemispherical, under 2 lines in diami tei , 

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

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



Fruit. On thick, angled pedicels, hemispherical to 



pilular; rim variable, thin, or truncate, and l*6 

 even domed occasionally; valves slightly 

 exserted ; about 4 lines in diameter, 



The fruits are very much like ih I ■ nioidi s. 



Habitat. Richmond River district, Cook River, Sydm 

 Bla< kin .nil, New South Wall 



Timber. 01 a dark brow lour hence the specific name), comparal 



onl) with other " Stringybarks," occasionally affected with borers, and not 

 valued for durability b\ those interested in the timbei trade. 



