SOME NEW ENGLAND EUCALYPTS AND THEIR ECONOMICS. 2(7 



Essential Oil. — Leaves were kindly sent to the Techno- 

 logical Museum from Walcha by Mr. J. F. Campbell, and 

 distilled 18/9/99. The material was collected as would be 

 done for commercial distillation. The crude oil was of an 

 orange-lemon colour, and had an odour indicating an oil of 

 the pinene-eucalyptol class. It was very rich in eucalyptol, 

 contained some pinene, but phellandrene was quite absent. 

 The higher boiling portion consisted largely of the sesqui- 

 terpene common to these oils. The ester was small in 

 amount. The rectified oil was slightly tinged yellow as is 

 common with the rich eucalyptol oils of this class. 



Leaves of this species were received later from Woolbrook 

 and distilled 8/4/08. The oil was identical with that from 

 the previous material both in the crude and rectified 

 condition. 



The following are the results obtained with the crude 

 oils from these two localities: — 



Yield of oil per cent 



Specific gravity at 15° C. 

 Rotation a D 



Refractive index at 19° C. . 

 S.N. of ester and free acid . 

 Eucalyptol in portion distilling 



below 183° C =73percent. =78percent. 



As the eucalyptol in the Walcha sample had been deter- 

 mined by the phosphoric acid method, that in the Woolbrook 

 oil was also so determined. 



Rectifying the Walcha sample, between 172-183° 77 

 per cent, distilled; between 183-245° 11 per cent.; and 

 between 245-265° 5 percent. These results agree very 

 well with those obtained with the Woolbrook sample. 



The first fraction as shown above consisted very largely 

 of eucalyptol with pinene. The oil from the original 



iha, 18/9/99. 



Woolbrook, 8/4/08. 



= 0*729 



= 0*744 



= 0*9223 



= 0*9246 



+ 1*9° 



+ 1-8° 



= 1'4716 



at 20°= 1-4729 



= 8*7 



= 7*6 



