321 



The tetrabromide was formed in the usual way with the fraction distilling 

 at 175-177, and when purified melted at 104-105 C. It thus appears that the 

 terpene present in the oil of this Eucalyptus was almost entirely laevo-rotatory 

 limonene, and that over 60 per cent, of the oil consisted of that substance. 



An aldehyde determination on the crude oil, using a 30 per cent, solution 

 of sodium bisulphite, gave an absorption equal to 16 per cent, of citral. This 

 aldehyde when purified formed the characteristic naphthocinchoninic acid by 

 Doebner's reaction, the product melting at 198 C. 



The non-aldehydic oil, which was quite aromatic, had a secondary odour 

 of geraniol. It had specific gravity at 15 C. = 0-8710; rotation , -- 46-8; 

 refractive index at 20 = 1-4802. 



The saponification number for the esters and free acid in the non-aldehydic 

 oil was 28-3, or 9-9 per cent, of ester, if calculated as geranyl-acetate, equal to 

 8-3 per cent, in the original oil. 



A portion of the non-aldehydic oil was acetylated in the usual way, when 

 the saponification number had risen to 78-5, representing 13-8 per cent, free 

 alcohol, calculated as geraniol, or n-6 per cent, on the original oil. 



The results of this investigation were originally published in the Phar- 

 maceutical Journal, London, March, 1906. 



172. Eucalyptus patentinervis. 



(R.T.B., Proc. Linn. Soc., N.S.W., 1899, p. 602, t. XLV.) 

 Half Mahogany. 



Systematic. A good-sized tree, as far as seen, with a bark similar' to 

 that of some species of Pines. Ultimate branchlets angular. Abnormal leaves 

 ovate, shortly acuminate, lanceolate, thin, almost membraneous, petiole slender, 

 from i to 2 inches long; venation prominent, iniramarginal vein removed. from 

 the edge. Normal leaves lanceolate-falcate, coriaceous, acuminate, almost i 

 foot long in some cases, not shining, colour uniform on both sides, petiole rather 

 slender, channelled above ; venation very distinct in the coast trees, but finer in 

 the inland ones, lateral veins very prominent and spreading, curved, numerous, 

 the intramarginal vein removed from the edge. Peduncles axillary, about i 

 inch long, flattened, bearing about ten fairly large flowers. Calyx tube occa- 

 sionally angular, 6 lines long; operculum about 'as long as the calyx, conical, 

 sometimes concave below the summit. 



Fruit. Large, hemispherical, to pyriform, on a 

 pedicel of about 4 lines in length ; rim quite 

 i line broad; valves prominently exserted, 

 acute or. occasionally obtuse as depicted ; 

 nearly 3 lines long, 4 lines in diameter. 



These are very much like an enlarged form of E. resini- 

 fera, but more bell-shaped. 



Habitat. Ballina, Bungwahl, Belmore, Milton, Ashfield, Sassa- 

 fras, New South Wales, 



