294 



members of the " Mountain Ash " group of Eucalypts, but in its general 

 characters more closely approaches, perhaps, that of E. oreades than any of the 

 others. The following results were obtained with the crude oil : 

 Yield of oil per cent. ... ... ... ... 0-85. 



Specific gravity at 15 C 0-8804. 



Rotation a D - 25-8. 



Refractive index at 20 C. ... ... ... ... 1-4847. 



Scarcely soluble in 10 volumes 80 per cent, alcohol. The saponification 

 number for the esters and free acid was 7-6. 



On rectification, i per cent, distilled below 175 C. (corr.). Between 175- 

 188, 68 per cent, distilled ; between 188-224, JI P er cent, came over, and between 

 224-265, ii per cent, distilled. These fractions gave the following results : 

 First fraction, sp. gr. at 15 C. --= 0-8589; rotation a D - - 34-8; refractive 



index at 20 = 1-4803. 

 Second ,, ,, = 0-8714; rotation a D - - 32-6; refractive 



index at 20 = 1-4826. 

 Third ,, ,, ,, = 0-9224; rotation not taken; refractive 



index at 20 = 1-4980. 



The phellandrene in the oil of this species has a less Isevo -rotation 

 than is the case with such species as E. dives, E. radiata, &c., so that the 

 influence of the dextro-rotatory modification is assumed. 



The results obtained with the oil of this species were published by .us 

 in the Proc. Roy. Soc., N.S.W., November, 1911. 



PLATE LXXII1. 



EUCALYPTUS OREADES. R.T B. 

 Rocky Towers, Hazelbrook, New South Wales. 



