Forester at Moruya, Mr. Clulee, and his assistant, Mr. Harrison, who drove his 

 car, it was possible to make extensive observations over a considerable area of 

 country, concerning this Eucalypt. Since that time numerous analyses of the 

 oil have been made for distillers, who have prepared the oil f.r market, and quite 

 an industry has now been established in the production of this particular 

 Eucalyptus oil, and large quantities have already been sold. 



The determination of rotations so far made, have shown the "first hour 

 oil " to be usually slightly dextro-rotatory, although if the distillation be 

 continued longer, the resulting oil may be slightly laevo-rotatory. This result 

 appears to be due to the presence of some terpineol. Improvements in this 

 method of first distillation will result in the production of a pharmaceutical oil 

 from this species growing in other localities, and already at Burraga, ir the 

 Bathurst district, it is being so worked for pharmaceutical oils. An analysis of the 

 oil from th's district is given later. 



In the first edition of this work, p. 275, we drew attention to some 

 remarkable features shown by the oils of this group, particularly that of solu- 

 bility in 70 per cent, alcohol, a result which placed the species in the class 

 yielding Eucalyptus oils richest in cineol, thus practically predicting the present 

 results. This high solubility is due to the presence of the alcohols terpineol and 

 geraniol as well as to the cineol. Tha + this is so is shown by the increased 

 saponification numbers of the acetylated higher-boiling fractions, as well as 

 from the results with the Nenigundah " second hour oil." 



Yield of Oil. The yield of oil from the Yourie-Tanto material agrees with 

 that of this species from other localities, and our sample, distilled at the Museum, 

 gave 4-4 per cent, for leaves with terminal branchlets, collected in the month of 

 November. The material, which had dried somewhat, was weighed into the 

 still and the amount of oil determined. These figures may perhaps be considered 

 as the maximum yield. From a series of results obtained by Mr. E. McGrath, of 

 Yourie, during the months of June, July, August, September and October, the 

 differences of yield at various times of the year are well illustrated. Mr. 

 McGrath uses a pair of tanks coupled together and worked simultaneously. 

 These are the usual 4Oo-gallon square iron tanks, fitted in the simple manner 

 customary wii;h the majority of Eucalyptus oil distilling plants in New South 

 Wales, and fired directly. 



Average yield of oil from the two tanks for all distillations. 



The months of June and July are midwinter in Australia, when the oil is 

 at a minimum. 



The actual weight of green leaves with terminal branchlets packed into 

 the tanks was not known, but if this be considered as 800 lb. per tank, which 

 amount would probably be nearly correct, then for June an average yield of 2-5 

 per cent, was obtained : for July 3 per cent., tor August 3-2 per cent., tor Septem- 

 ber 3-4 per cent., and for part cf October 3-3 per cent. 



