i©6 



The crude oil had specific gravity at 15 C. — 0-9237; rotation a D 4- J - 7°; 

 refractive index at 20° = 1-4708, and was soluble in U volumes 70 per cent. 

 alcohol The saponification uumber for the esters and free acid was ii-i. After 

 acetylation, the saponification number was 58-4, showing the presence oi a 

 considerable amount of free alcohols. 



On rectification, the usual amount of acid water and volatile aldehydes 

 came over below 104 C. (corr. . Between 164-183°, 81 percent, distilled ; between 

 i s ; I'M ■ l - P er cent, came over, and between 194-265°, 5 percent, distilled. 

 These fractions gave the following results : — 



First fraction, sp. gr. at 15° C. = 0-9159; rotation a r , + 1-05°. 



Second ,, ,, ,, = 0-9308; ,, <?" 4- 4-80°. 



Third ,, ,, ,, = 0-9475; ,, not taken. 



A high-boiling dextro-rotatory alcohol was evidentlv present in the third 

 fraction. The cineol determined by the phosphoric acid method in the large 

 fraction was 52 per cent. (O.M. , indicating about 45 per cent, in the original oil. 



The above sample of oil had been preserved in the dark, and in September, 



1919, was again analvsed. No great change was observable in the character 



of the oil after nineteen vears, except perhaps, that it was a little richer in cineol. 



On rectification, 84 per cent, distilled below 190° C. The results with the 



crude and rectified oils were as follow : — 



Crude oil, sp. gr. at 15° C. = 0-9297; rotation a D + 3 ; refractive index 



at 20° = 1-4709. 

 Fraction ,, ,, = 0-9168 ; rotation a B 4- 2-0° ; refractive index 



at 20 = 1-4637. 

 The cineol was determined bv the resorcinol method in the portion distilling 

 below 1 90°. When calculated for the crude oil, the result was 65 per cent. By 

 the phosphoric acid method it was 53 per cent. 



53. Eucalyptus Rossii. 



(R.T.B. & H.C.S.. m Euc. and their Ess. Oils, ist Edit.. 1902.) 

 White Gum. 



Systematic. — A medium-sized tree, with a smooth, white bark. Leaves 

 lanceolate, generallv under 6 inches long, mostly narrow, falcate and thin, rarelv 

 over 12 lines wide; venation distinct, intramarginal vein removed from the edge, 

 lateral veins oblique, spreading. Peduncles axillary, rarely forming panicles, 

 slender, flattened, under twelve flowers in the head, pedicel almost filiform, 

 2 lines long. Calvx under 2 lines in diameter; operculum hemispherical, 

 shortlv acuminate. 



Fruit.— Hemispherical; rim red, broad in compari- ^ 



son to the size of capsule ; valves slightly ^^1 £|9 

 or not exserted; about 2 lines in diameter. 3 



They are similar with those of E. fu-emastoma, var. 

 micrantha, and care is required not to confound 

 botanically the two species. 



Habitat. — Tableland and Coast district of Eastern Australia. 



