121 



REMARKS. A good -sized, straight-stemmed tree; except for the greyish tinge of the foliage, it resembles 

 in appearance E. punctata, DC., the trunks having the same general grey colour, but with lighter coloured patches on 

 them. There has been some doubt in the past whether this tree should not be placed with E. tereticornis , Sm., but 

 timber, bark, and fruits, as well as the oil differ from those of that species, and as these characters are constant 

 throughout its extensive distribution, i.e., east and west of the Great Dividing Range, it has been decided to retain 

 Cunningham's naming. A feature of the inflorescence is the very small, brown-coloured, second operculum, which 

 comes off early in the bud stage. 



ESSENTIAL OIL.- Leaves and terminal branchlets for distillation were 

 obtained from Condobolin, New South Wales, in March, 1901. The yield of oil 

 was 0-85 per cent. The crude oil was the colour of olive oil, and had an odour 

 resembling those of the cineol-pinene class. It was rich in cineol, contained 

 some pinene, but phellandrene was absent. The higher boiling portion con- 

 sisted largely of the sesquiterpene, together with a high boiling dextro-rotatory 

 alcohol. The rectified oil had a yellowish tint, resembling, in this respect, those 

 belonging to this class. The oil is a good one for pharmaceutical purposes. 



The crude oil had specific gravity at 15 C. = 0-9261 ; rotation D + 3-8, 

 refractive index at 20 = 1-4648, and was soluble in if vols. 70 per cent, alcohol. 

 The saponification number for the esters and free acid was 2-1. 



On rectification a small amount of acid water and volatile aldehydes came 

 over below 166 C. (corr.). Between 166-183, 88 per cent, distilled; between 183- 

 255, only 2 per cent, came over, and between 255-268, 5 per cent, distilled. 

 These fractions gave the following results : 



First fraction, sp. gr. at 15 C. = 0-9193 ; rotation a D + 2-6. 

 Third ,, ,, = 0-9460; ,, not taken. 



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

 was 58 per cent. (O.M.), indicating about 52 per cent, in the crude oil. 



This sample of oil had been stored in the dark, and in September, 1919, 

 eighteen years afterwards, was again analysed. Very little alteration had taken 

 place in the oil during all that period, except that it was richer in cineol, in fact, 

 the rectified oil consisted principally of cineol and pinene. 



On redistilling, 90 per cent, came over below 190 C. The crude oil and 

 large fraction gave the following results : 



Crude oil, sp. gr. at 15 C. = 0-9290; rotation D + 3-6; refractive index 



at 20 = 1-4649. 

 Large fraction ,, ,, 0-9228 ; rotation D + 2-5 ; refractive index 



at 20= 1-4594. 



The cineol was determined by the resorcinol method in the portion 

 distilling below 190 ; when calculated for the crude oil the result was 87 per 

 cent. By the rapid phosphoric acid method it was 73 per cent., when calculated 

 for the crude oil. 



50068 I 



