§7 



ESSENTIAL OIL. I and iriiinn.il branchlets for distillation were 



obtained from Barber's I reek, New South Wales, in June, [8g8. The yield "I 

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

 odour. A somewhat large .mi. Mint oi pinene was present, while the higher boiling 

 portion consisted largely oi the sesquiterpene. Phellandrene was nol detected. 

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

 largely oi a valeric acid estei and geranyl acetate. The portion distilling above 

 250 was "I a bright blue 1 olour. 



The crude oil had specific gravit} .11 15 C. 0-9056; rotation a, - . 

 refractive index a1 20 = r/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 [64 C. corr. . Between 164 

 172 , 47 per cent, distilled ■ between 172 250 . 11 per cent, came over, and 

 between 250 265 , E2 per rent, distilled. These fractions gave the following 

 results : 



First traction, sp. gr. at 15 C. = 0-8872; rotation a B +17 

 Second .. ,, = < '-goo \ ; rotation a n -f 6-8 



rhird ., .. .. = 0-9355 ; rotation not taken. 



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

 Eraction, indicated 23 per cent, in the crude oil O.M. . 



Another sample of the oil oi 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 tin 

 21 years it had been stored, except that the specifii gravitj had increased a little. 

 On distillation So per cent, came over boiling below 11,0° 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 + 17, ; refractive index 



at jo - I- (.658. 



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

 ling below r.90 , when calculated tor the crude oil die result was [2 percent. 

 By the rapid phosphorii acid method d was 26 per cent, when calculated tor the 

 crude oil. 



40. Eucalyptus Baeuerlenu 



(F.v.M., in Vi V,, Octol ■ C890, p 

 Brown Gum. 



Systematic. A tree only known, so tar, from the Sugar Loai Mountain, 

 ( lydi road, between Nelligen and Braidwood, occurring there on the very rocky 

 declivities at an altitude from 2,000 t,ooo feet; attaining at the lowesl level a 

 diameter oi 2 feel and a heighl from 40 to 60 feet, while at the highest elevation 



pon feel it grows shrubby or in"mallee" form 1 1 feel high, flowering 



profusely. H has a habit oi growing in clusters oi perhaps lorn to eight 



