REMARKS. I tedii M.( ... who 



especially their essential oils. I In name " Re< 

 stand how il can ■ is quite | 



[or working ha\ I mm h resi Eni lish I s> >x. li both in tl 



bridge decking, and altogether i-- .1 tree worth) ol cultivation, 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation were 

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

 ol oil was 0-97 per cent. The crude "il was orange brown in colour, and had an 

 odour resembling those oi the cineol-pinene class ol Eucalyptus oik generally. 

 Pinene was the prim-i j >.il terpeue, and cineol was preseni m some quantity, 

 Init pi H'l land rene was absent, .ind the esters quite small in amount. Terpineol was 

 deteeted. The volatile aldehydes were pronounced. The fourth fraction con- 

 sisted largel} ol the sesquiterpene. 



The crude nil had specific gravit\ al 15° C. = 0-91 178 ■ rotation a -i ',-26°; 

 refractive index at 20 = 1-4675, and was soluble iii 5 volumes 70 per cent. 

 ohol. The saponification number for the esters and free acid was 3-2. 



On rectification, 2 per cent, distilled below 107' C. ton. . Between 

 167-172°, 41 per cent, distilled; between 172-183°, 40 per cent, came Over; 

 between 1N3 250°, 8 per cent, distilled, and between 250 265°, 3 per cent. 

 distilled. These tractions gave the following results : — 



First traction, sp. gr. at 15° C. = 0-8981 ; rotation a D + 13-4°- 

 Second „ ,, ,, = 0-9096; ,, + 7-37°. 



Third ,, ,, ., = 0-9189; ,, not taken. 



Fourth ,, ,, ,, — 0-9376; 



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

 boiling below 183°, was 43 per cent. O.M. ; indicating about 35 per cent, in the 

 crude oil at time of distillation. 



The above sample had been stored in the dark, and in August, 1919, was 

 again analysed. 84 per cent, distilled below 190 C. There was an apparent 

 increase in the cineol content, as is indicated by the physical properties as well 

 as by the quantitative determinations. The crude oil and the fraction gave the 

 following resull - 



Crude oil, sp. gr. at 15° C. = 0-9302; rotation </,. -f- 9-4°; refractive index 



at 20° = I- (.679- 



Fraction ,, ,, = 0-9134; rotation a D + 9-0° ; refractive index 



at 20° = I-4633- 



The cineol was determined by the resorcinol method in the traction and 

 calculated for the crude oil; the result was 63 per cent, A determination by 

 the rapid phosphoric acid method on the traction and calculated for the crude 

 oil gave 58 per cent, of cineol. The difference was largely due to the terpineol. 



