264 



detected, under ordinary circumstances, in the oils of this species. The laevo- 

 rotation of the first fraction, caused by the presence of the phellandrene, 

 distinguishes this species from E. dextropinea. The varying amounts of phel- 

 landrene and pinene, the one laevo- and the other dextro-, cause the rotation 

 of the oils distilled at different times of the year to be not constant, the Isevo- 

 rotation of the phellandrene, when this terpene is pronounced, overcoming the 

 dextro-rotation of the pinene, and the phellandrene, having such a high optical 

 rotation, becomes more active in this way than does the pinene. The 

 eudesmol also influences the rotation to the right. 



The following results were obtained with the August sample. The 

 specific gravity of the crude oil at 15 C. = 0-8935 ; rotation a D + 5-8 ; 

 refractive index at 20 = 1-4904, and was not soluble in 10 volumes 80 per cent. 

 alcohol. The saponification number for the esters and free acid was 5-9. 



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

 183,. 50 per cent, distilled; between 183-204, 16 per cent, came over, and 

 between 204-280, 25 per cent, distilled. These fractions gave the following 

 results : 



First fraction, sp. gr. at 15 C. = 0-8595 ; rotation D -- 11-6. 

 Second ,, ,, = 0-8662 ; ,, - 9-9. 



Third = 0-9410; + 20-9. 



The third fraction was acetylated, when the saponification number had 

 risen to 56-4, showing the presence of about 23 per cent, of the liquid form of 

 eudesmol in this fraction. 



Belmore and Currawang Creek are 'far apart, but the results obtained 

 with the oils from those localities differed but little from the above, with the 

 exception that the phellandrene was more pronounced in the Belmore sample, 

 and the alcohols in that from Currawang Creek. 



The general results obtained with the four samples of oil are here tabulated. 



The varying effects on the rotations of Eucalyptus oils by the optically 

 active constituents with opposite rotations is well demonstrated with those from 

 this species, and this peculiarity is very apparent with oils having phellandrene as 

 a pronounced constituent, when pinene is also present in quantity. 



