45 



to the appearance of the bark, and of the tree generally. The chemistry of 

 the exudation also shows this tree not to belong to the ' Peppermint " 

 group. 



The following table gives the general results obtained with the crude oils 

 of this species from four localities given above. The yields of oil were from 

 leaves and terminal branchlets collected as for commercial oil distillation. 



On rectifying the crude oil of the Tenterfield sample, i per cent, distilled 

 below 159 C. "(corn). Between 159-170, 10 per cent, distilled; between 

 170-245, 9 per cent, came over ; and between 245-273, 76 per cent. ; over 50 per 



These fractions gave the following results : 



cent, distilling between 265-273 

 First fraction, sp. gr. at 15 C. 



refractive 



Second 

 Third 



refractive 

 refractive 



= 0-8652 ; rotation a D + 30-3" 



index at 20 : 1-4674. 

 = 0-8713 ; rotation D + 22-4 



index at 20 = 1-4720. 

 = 0-9326; rotation a D 2-1: 



index at 20 : 1-4984. 



The light passed the third fraction very well when diluted with chloroform. 

 The two first fractions were again distilled, when 9 per cent., calculated on the 

 original oil, came over between 156-157 C. This fraction had specific gravity at 

 15 = 0-8631; rotation a D + 31-6; refractive index at 20 1-4668, and was 

 almost pure pinene. The nitrosochloride melted at 103-4. The oil of this 

 species is one of the best from which to obtain the sesquiterpene. 



The fractions distilling below 170, as first obtained, had the following 

 specific gravities and rotations : 



0-8652 

 0-8705 

 0-8638 



Tenterfield, sp. gr. at 15 C. = 

 Armidale ,, ,, 



Uralla 



rotation 



Walcha 



= 0-8670; 



+ 30-3 - 



+ 24-4- 



+ 27-7. 



+ 33-07' 



The crude oil of the original sample from Walcha had specific gravity at 

 15 C. = 0-907; rotation a D + 14-5; refractive index at 20 = 1-4843, and was 

 insoluble in 10 volumes 80 per cent- alcohol The Saponification number for 

 the esters and free acid was 5-1. 



