282 



The specific gravity of the crude oil = 0-9012, and of the first fraction 0-8956. 

 The optical rotation of the crude oil was a D - - 12-2, and of the first fraction 

 a - - 13-6. The cineol in the crude oil determined by the phosphoric acid 

 method was 32 per cent. (O.M.). The crude oil was soluble in i-- volumes 70 per 

 cent, alcohol, as in the previous case. 



As illustrating the general characters of commercially distilled oils of 

 this species, the following list is given. There was no doubt as to the 

 authenticity of these samples as submitted to us. 



The localities represent a considerable area of country. They were all 

 crude oils, and the cineol was determined by the phosphoric acid method. 



As the yield of oil from this species was so large, it was thought desirable 

 to undertake experiments in order to determine whether an oil richer in cineol 

 could be obtained by distilling the leaves in a special manner. We were indebted 

 to the Australian Eucalyptus Oil Company, of Sydney, for assistance in deciding 

 this question. This company was distilling oil from this species at Moss Vale, 

 N.S.W., and the product from one tank was collected for us, by separating the 

 whole of the oil that came over during the first, second, and third hours of dis- 

 tillation respectively. The ordinary square 4OO-gallon iron-tank, so extensively 

 used in this industry, was employed for the purpose. It was at once seen that 

 the oil which came over during the first hour was much richer in cineol than 

 either that of the second or third hours. The quantitative determinations of the 

 cineol were all made by the phosphoric acid method, and consequently are a 

 little lower than the true content, although comparative. 



First-hour Oil. Specific gravity = 0-9126 ; optical rotation D - - 9-2 ; 

 cineol = 38 per cent. (O.M.). 



Second-hour Oil. Specific gravity = 0-902 ; optical rotation a D - - 12-5 ; 

 cineol = 15 per cent. (O.M.). 



Third-hour Oil. Specific gravity = 0-898; optical rotation fl, - - 21-0; 

 cineol was present in very small quantity. 



Phellandrene was present in all three samples, but was more pronounced 

 in the oil distilling during the second and third hours. 



A consignment of the commercially distilled crude oil from this species, 

 containing the whole of the oil obtainable from the leaf, gave the following 

 results: Specific gravity = 0-905; optical rotation a D - - 11-3; cineol = 27 

 per cent. (O.M.). 



