314 ON SOME NEW SPECIES OF EUCALYPTUS, 



of aldehydes like all good oils of this class. When rectified by 

 distillation the oil is almost colourless, being slightly tinged 

 yellow, also resembling oils of this class. Phellandrene is of 

 course absent. Eudesmol was not detected at this time. There 

 are practically but little constituents boiling at a high tempera- 

 ture, as 95 per cent, distilled below 185° C, consequently the 

 rectified oil is of low specific gravity, and although containing 

 just upon 60 per cent, of eucalyptol, yet this sample would not 

 pass the test of specific gravity as fixed by the Pharmacopoeia, as 

 the specific gravity of the crude oil is only 0-9097 at 15° C. 

 This is an excellent illustration of the unsatisfactory nature of 

 this standard of specific gravity of 91 as fixed by the Pharma- 

 copoeia; this oil is one of the best we have distilled, yet because 

 it is deficient in high boiling constituents, which bodies may be 

 considered objectionable both from a medicinal and commercial 

 point of view, it is penalised or practically condemned because it 

 is too good. It has been proved during this research over and 

 over again that a Eucalyptus oil must not be condemned if 

 its specific gravity is below 91 at 15° C. It is again suggested 

 that the standard of minimum specific gravity for Eucalyptus oil 

 be reduced to 0-905 at 15° C. 



This oil consists principally of dextropinene and eucalyptol. 

 The oil commenced to distil at 166° C.,* (neglecting the water 

 and aldehydic bodies tnat came over below this temperature) and 

 between this and 183° C. 94 per cent, distilled. This rectified oil 

 is excellent. 



Specific gravity of crude oil at 15° C. = 0-9097. 



Specific gravity of fraction 16(3-183° C. at 15° C. = 0-9095. 



Specific rotation crude oil = [«] J) + 6 7°. 



Specific rotation large fraction = [a]p) + 7 -2°. 



Eucalyptol, crude oil = 57 - 5 per cent. 



Eucalyptol, fraction 166-183° C. = 59-5 per cent. 



Another consignment of leaves was sent from the neighbour- 

 hood of Girilambone, but obtained some miles from the locality 



* These temperatures are corrected to the nearest whole degree. 



