75 



ESSENTIAL OIL. A sample of xhc oil of this species was forwarded to 

 us for investigation by Mr. C. E. Lane-Poole, the Conservator of Forests of Western 

 Australia. The oil had been distilled by Mr. Braddock of that State, who obtained 

 a yield of 0-5 per cent. 



The crude oil was mobile, of a light amber colour, with a terpene-like odour, 

 and a secondary aromatic one. It contained a considerable quantity of pinene, 

 but phellandrene was absent. Both limonene-and terpinene were present, as 

 was also cineol. The ester was apparently largely geranyl-acetate. 



The crude oil had specific gravity at 15 C. = 0-8852 ; rotation 31-2 ; 

 refractive index at 20 1-4719; and was soluble in 10 volumes 80 per cent, 

 alcohol. The saponification number for the esters and free acid was 7-5. 



On rectification, i per cent, distilled below 160 C. (corr.). Between 

 160-172, 61 per cent, distilled; between 172-193, 28 per cent, distilled, leaving 

 10 per cent, of residue. The fractions and residue gave the following results : 

 First, fraction, sp. gr. at 15 C. = 0-8740; rotation - 33-2 ; refractive 



index at 20 = 1-4671. 

 Second ,, ,, ,, = 0-8837; rotation a D - - 35-0 ; refractive 



index at 20 = 1-4710. 



Residue ,, ,, = 0-9521; rotation n - ~ 3-0 ; refractive 



index at 20 = 1-4988. 



The lower boiling portion of the first fraction gave a nitrosochloride melting 

 at 104 C., so that pinene was present in quantity. 



The second fraction contained limonene, dipentene, and terpinene. 



The saponification number for the residue was 15-1, and in the cold with 

 two hours' contact it was 9-6. The odour of the cold saponified oil was that of 

 geraniol, so that the indication is 3-36 per cent, of geranyl-acetate in that 

 portion. 



The saponification number for the first fraction was 8-1, so that a low 

 boiling ester, probably butyl-butyrate, was present. 



The cineol was determined by the resorcinol method in the portion dis- 

 tilling below 193 ; when calculated for the crude oil, the result was 30 per cent. 

 As the low boiling esters were also absorbed this is somewhat in excess of the real 

 amount, and phosphoric acid did not indicate more than about 15 per cent, in the 

 crude oil. 



See also the article in this work, " On the occurrence of Terpinene in 

 Eucalyptus Oils." 



32. Eucalyptus redunca. 



(Schau., in Lehmann's Plant. Preiss. , I, 127, 1844.) 

 White Gum. 



Systematic. A shrub or small tree preaching up to 120 feet, F.v.M., 

 var. elata, Benth.), with a smooth white bark. Normal leaves ovate- 

 lanceolate to lanceolate, sometimes acuminate, averaging about 3 inches long, 

 thick, coriaceous, often somewhat crenulate ; venation moderately distinct at 

 times, intramarginal vein looped, much removed from the edge, lateral veins 



