ESSENTIAL OIL. Leaves and terminal branchlets for distillation wen- 

 obtained from Barber's Creek, New South Wales, in June, 1898. The yield of 

 oil was 0-24 per cent. The crude oil was red in colour, and had a turpentine-like 

 odour. A somewhat large amount of pinene was present, while the higher boiling 

 portion consisted largely of the sesquiterpcne. Phellandrene was not detected. 

 Cineol occurs in this oil, although not in large amount. The esters consisted 

 largely of a valeric acid ester and geranyl-acetate. The portion distilling above 

 250 was of a bright blue colour. 



The crude oil had specific gravity at 15 C. ;= 0-9056; rotation D + 10; 

 refractive index at 20 1-4716, and was soluble in i volume 80 per cent, 

 alcohol. The saponification number for the esters and free acid was 18-4. 



On rectification 2 per cent, distilled below 164 C. (corr.). Between 164- 

 172, 47 per cent, distilled; between 172-250, 34 per cent, came over, and 

 between 250-265, 12 per cent, distilled. These fractions gave the following 

 results : 



First fraction, sp. gr. at 15 C. ;; 0-8872; rotation a D + 17-0. 

 Second ,, ,, ,, = 0-9002; rotation a D + 6-8. 



Third ,, ,, ,, : 0-9355; rotation not taken. 



The cineol, determined by the phosphoric acid method in the second 

 fraction, indicated 23 per cent, in the crude oil (O.M.). 



Another sample of the oil of this species was obtained from Barber's Creek 

 in May, 1898. This oil agreed with the above sample except that the yield was 

 less, but in ester content, rotations for the several fractions and other physical 

 characters, as well as in the amount of cineol present, the oils were practically 

 identical. 



The first sample of oil had been kept in the dark, and in September, 1919, 

 was again analysed. Very little alteration had taken place in the oil during the 

 21 years it had been stored, except that the specific gravity had increased a little. 

 On distillation 80 per cent, came over boiling below 190 C. The crude oil and 

 fraction gave the following results : 



Crude oil, sp. gr. at 15 C. = 0-9192; rotation not taken ; refractive index 



at 20 = 1-4724. 

 Fraction ,, ,, ,, = 0.8964; rotation a D + 13; refractive index 



at 20 : 1-4658. 



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

 ling below 190 ; when calculated for the crude oil the result was 42 per cent. 

 By the rapid phosphoric acid method it was 26 per cent, when calculated for the 

 crude oil. 



40. Eucalyptus Baeuerleni. 



(F.v.M., in Vic. Nat. October, 1890, p. 76.) 

 Brown Gum. 



Systematic. A tree only known, so far, from the Sugar Loaf Mountain, 

 Clyde-road, between Nelligen and Braidwood, occurring there on the very rocky 

 declivities at an altitude from 2,000-4,000 feet; attaining at the lowest level a 

 diameter of 2 feet and a height from 40 to 60 feet, while at the highest elevation 

 (4,ood" feet) it grows shrubby or in " mallee " form 4 to 10 feet high, flowering 

 profusely. It has a habit of growing in clusters of perhaps four to eight 



