SOME NEW ENGLAND EUCALYPTS AND THEIR ECONOMICS. 275 



Essential Oil, — Leaves were obtained from Tenterfield 

 and distilled 21/1/10. The material was collected as would 

 be done for commercial distillation. The crude oil was 

 lemon-yellow in tint, and but slightly coloured, and had a 

 secondary odour of peppermint. It has all the appearances 

 and characters of a "Peppermint Oil," and resembles very 

 closely the oils distilled from the group of which E. dives 

 may perhaps be considered the type. The principal con- 

 stituents in the oil are laevo-rotatory phellandrene, piperi- 

 tone, and the sesquiterpene, of which the first predominates 

 very greatly, in fact, this species may be considered as 

 yielding one of the most pronounced phellandrene bearing 

 Eucalyptus oils, not even excepting E. racliata. Pinene 

 appears to be quite absent, and eucalyptol was only detected 

 with difficulty. The amount of ester was very small, as 

 was to be expected. The crude oil gave the following 

 results : — 



Yield of oil per cent = 1*27 



Specific gravity at 15° O = 0*8646 



Rotation a D r ...— — 41*5° 



Refractive index at 15° C = 1*4854 



S.N. of the ester + free acid = 4*3 



Insoluble in 10 volumes 80 per cent, alcohol. 



On rectification only a few drops of acid water and a 

 small quantity of volatile aldehydes came over below 174° C. 

 Between 174 - 178° 56 per cent, distilled ; between 178 - 

 182° 26 per cent.; between 182-194° 6 per cent. The 

 temperature then rose to 245° and between that and 255° 

 8 per cent, came over. It thus divided roughly into the 

 tractions containing the main constituents, although in the 

 higher ones phellandrene was still present. 



The specific gravity at 15° O. of the first fraction = 0*8508; 

 of the second = 0*8563; of the third = 0*8749; and of the 

 fourth = 0*9034. The rotation of the first fraction a D - 47*2 ; 



