3 62 



Ordinary constants for the crude oils employed arc given, together with 

 their cineo] contents, calculated from the results obtained with the rectified oils. 

 The alcoholic values, determined after acetylation, are calculated for C IO H lS 0. 



From the results here appended it is seen that the cineol in the oils of the 

 E. ciicon to/in and E. Australiana types cannot be satisfactorily determined 

 quantitatively by the resorcinol method, although it might well be employed for 

 the oils of the class to which E. polybractea and E. Smithii belong, and give 

 results comparable with those obtained with phosphoric acid 



EUt '. 1 /. YPTUS POLYBRACTK. I . 

 Wyalong, N.S.W. 



Specific gravity at 15° C. 

 Optical rotation a D 

 Refractive index at 20 C. 

 Cineol (rapid phosphoric acid method) 

 Cineol (resorcinol method) 

 Absorption with NaHSO., 

 Saponification number (1 \ hours hot) . 

 After acetylation (ij hours hot) 



Crude oil. 



= 0-920I 



+ i-8° 



= 1-4595 



= 78 per cent. 



= 82 per cent. 



Rectified portion boiling 



below 190 C. 



(91 per cent.) 



= 0-9194 



+ i-9° 



= 1-4594 



= 86 per cent. 



= 90 per cent. 



= 2 per cent. 



= 4-06. 



= 10-52. 



= i-8 per cent, free alcohol. 



By allowing for the absorbable constituents and the free alcohol the 

 cineol was practically the same both by the phosphoric and resorcinol methods. 



EUCALYPTUS SMITHII. 

 Hill Top, N.S.W. 



In this case, also, after allowing for the absorbable substances other than 

 cineol, the results were practically the same by both methods. 



