1/-' 



Analysis of the Oil. — The crude oil of the Yourie and Tanto material 

 distilled at the Technological Museum, was of a very light lemon tint, had quite 

 a pleasant odour, the volatile aldehydes not being at all pronounced. Tin- oil 

 contained a large amount of cineol. The reaction for phellandrene was not 

 distinctive, and this terpene probably does not occur in the oil of this species at 

 any time ex< ept \a traces. 



The crude oil, which had been distilled right out, had specific gravity at 

 15 C. = 0-9157; rotation a D + 2-8°; refractive index at 20 = 1-4644; and 

 was soluble in 1-2 volumes 70 per cent, alcohcl. The saponification number 

 for the esters and free acid was 8-9. 



On rectification, 2 per cent, distilled below 172 C. (corr.). Between 

 172-193 , 84 per cent, distilled; between 193-220 , 5 per cent, distilled, and 

 between 220-260 , 5 per cent, distilled. These fractions gave the following 

 results : — ■ 



First fraction, sp. gr. at 15° C. = 0-9119; rotation a D + 2-7°; refractive 



index at 20 = 1-4623. 

 Second ,, ,, „ =0-9165; rotation a D 4-0-8°; refractive 



index at 20 — 1-4679. 

 Third ,, ,, ,, =0-9380; rotation <? D 4- 0-6° ; refractive 



index ar 20 = 1-4861. 



The cineol was determined by the resorcinol method in the first fraction, 

 and calculated for the whole oil ; the result for the crude oil was 70 per cent. By 

 the phosphoric acid method it was 66 per cent. The higher fraction contained 

 a little piperiLone (the constituent cf peppermint odour), a small amount of 

 ester, and free alcohols. A portion of the crude oil was then acetylated in the 

 usual manner, when the saponification number had risen to 51.3. This result 

 indicated the presence of alcohols in fair quantity, to which constituents the 

 aromatic and somewhat characteristic odour of the oil was largely due. As the 

 alcohol was chiefly terpineol there was about 12 per cent, of that constituent in 

 the crude oil, assuming the whole alcohol to be that substance. The presence of 

 the terpineol is more distinctly shown with the second and third hour oils, which 

 were distilled and collected for us by Mr. Gough, of Youne. Geraniol is also a 

 constituent in the oil of this species. 



" First Hour Oil." — As previously mentioned, the commercial distillation 

 of this species has resolved i1 self into a fractional separation during the primary 

 distillation of the oil from the leaf. 



The "first hour oil " is practically water-white, as are all the rectified oils 

 cf this group ; it is rich in cineol, of good odour, and is fairly constant in com- 

 position. The average specific gravity of the " first hour oil " taken by Mr. 

 McGrath for twenty-six distillations during the months of September and October 

 was 0-919, the highest being 0-920, the lowest 0-917. 



For the constants with the " first hour oil," see the table in the article " The 

 comparative constancy of the oil products from individual species of Eucalypts." 



Numerous analyses of this ' first hour oil " have been made at the 

 Technological Museum, beyond those enumerated in the table mentioned above. 

 They were, however, all in agreement, so that it is unnecessary to tabulate them 

 further. It may be stated, however, that the solubility in alcohol in no case 

 exceeded i-i volumes 70 per cent, alcohol, and that they all contained about 70 

 per cent, of cineol, determined by the phosphoric acid method. (See also an 

 analysis under the quantitative determination of cineol.) 



