ESSENTIAL OILS OF THE ANGOPHORAS, 111 



Sp. gr. at 15° C. Rotation a B Ref. index at 19° C. 

 First fraction 0*8658 + 37°.6 1*4661 



Second fraction 0*8689 + 32°.7 1*4680 



Third fraction 0*8995 + 4°.8 1*4721 



72 cc. of the added first two fractions were again distilled, 

 and before 156° 0. was passed 50 cc. had distilled ( = 50% 

 of the crude oil); and 14 cc. between 156 - 157°. These 

 two fractions gave results closely in agreement, as is seen 

 from the following: — 



Sp. gr. at 15° 0. Rotation a B Ref. index at 19° C. 

 First fraction 0*8612 + 37°.5 1*4658 



Second fraction 0*8622 + 36°.6 1*4663 



The indications from the above are that the only low 

 boiling terpene present in this oil is pinene, and that over 

 75 per cent, of the oil of this species consists of that con- 

 stituent. The odour too, of the terpene was distinctly 

 that of pinene. 



The nitrosochloride was prepared with a portion of the 

 first fraction, and this, when finally purified by precipitating 

 by methyl alcohol from a chloroform solution, melted with 

 decomposition at 103 - 104° C, thus confirming the 

 identity of the pinene. 



The saponification number for the esters, by boiling, 

 together with that of the free acid, was 33*6. The 

 secondary odour of the separated oil after saponification 

 was that of geraniol, and the presence of geraniol in these 

 oils was proved in that of A. melanoxylon. Acetic acid 

 and valerianic acid were also both shown to be present in 

 combination as esters in the oil of that species, and there 

 is no reason to suppose that the esters are different in the 

 oil of A. Bakeri, especially as the results of cold saponifi- 

 cation in both oils are similar, and as the Angophora oils 

 all resemble each other in constitution. 



