2gi 



The above sample was stored in the dark, and in November, 1919, was 

 again analysed. Not much alteration had taken place during the twenty-one 

 years it had been kept, except that the rotation with the crude oil had diminished 

 considerably. This was apparently due to the alteration in optical rotation of 

 the piperitone, as the phellandrene had not altered much. This is shown by the 

 fact that while the loss in rotation with the crude oil was 21-5, that with the 

 rectified portion was only 2-1. 62 per cent, distilled below 190 C. The crude 

 oil and the rectified portion gave the following results : 



Crude oil, sp. gr. at 15 C. = 0-8996; rotation a D - 7-8; refractive index 



at 20 : 1-4856. 

 Rectified portion ,. = 0-8693; rotation D 28-2; refractive index 



at 20 = 1-4776. 



The cineol was determined by the resorcinol method in the rectified portion ; 

 when calculated for the crude oil the result was 10 per cent. As piperitone was 

 present, a ketone determination was made in the rectified portion, with the result 

 that 6 per cent, was absorbed. Thus about 5 per cent, of cineol was present 

 in the crude oil. 



Material for distillation was obtained in March, 1913, from Mount Kosciusko, 

 N.S.W., the highest point in Australia, where the tree is known as the " Snow Gum." 

 The yield of oil was 0-76 per cent. 



The crude oil had a peppermint-like odour, due to the presence of piperitone. 

 Phellandrene was pronounced and pinene practically absent. Cineol was present 

 in very small amount, and crystallised eudesmol was also detected. The high- 

 boiling portion consisted largely of the sesquiterpene. 



Altogether this oil had strong resemblance to that originally distilled 

 from the material collected at Ilford in 1898. 



The crude oil had specific gravity at 15 C. 0-8983 ; rotation a D 27-0; 

 refractive index at 20 = 1-4890, and was soluble in i volume 80 per cent, alcohol. 

 The saponification number for the esters and free acid was 3-7. 



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

 below 190 C. ; when calculated for the crude oil, the result was 5 per cent. 



157. Eucalyptus Sieberiana. 



(F.v.M., in Eucalyptographia, Dec., ii, 1879.) 

 Mountain Ash. 



Systematic. A tall tree with a dark, fibrous, deeply-furrowed bark. 

 Abnormal leaves oblique, ovate, shortly acuminate, and about 3 inches long, 

 or lanceolate-falcate, over 6 inches long; venation distinct, lateral veins very 

 oblique, spreading, distinct, the intramarginal vein removed from the edge. 

 Normal leaves lanceolate, falcate, coriaceous, shining, or lustreless; venation 

 fairly prominent, and similar to that of abnormal leaves. Flowers on axillary, 



