180 



H. G. SMITH. 



A commercial sample of the bark oil of this species, 

 distilled by Mr. Quigg at Wingello, in March 1913, and 

 presented to the Museum by De Meric Ltd., George Street,. 

 Sydney, had the following characters: — 



Specific gravity at 15° O. = 0*9218 



Optical rotation a D = + 1*2° 



Refractive index at 20° = 1*4711 



Soluble in 1*2 volumes 70 per cent, alcohol. 



The saponification number by cold saponification with 

 two hours' contact was 169, equal to 59*2 per cent, geranyl- 

 acetate. The results obtained with this sample are almost 

 identical with those given by the oil distilled at the 

 Museum two years later. 



The results are tabulated for comparison : — 



Samples. 



Sp. gr. 

 at 15°C. 



Eot. aD 



Ref.ind. 

 at20°C. 



Sap. No. 

 Ester. 



Sap. No. 

 acetyla- 

 tedoil. 



Solubil- 

 ity 70% 

 alcohol 



Museum, 11/1915 

 Quigg's 10/1915 

 Quigg's 3/1913 



09214 

 0-9099 

 0-9218 



+ 1-2° 

 + 1-4° 

 + 1-2° 



1-4718 

 1-4648 

 1-4711 



169-5 



195 



169 



1988 

 224 



1-2 vols. 

 1-2 „ 

 12 „ 



This Eucalyptus is one of the very few species of the 

 genus from which an essential oil can be distilled from the 

 bark, and, so far as at present known, it is the only one 

 which, in this respect, may be considered of value from a 

 commercial point of view. 



