363 



EUCALYPTUS AUSTRALIANA. 



Nerrigundah, N.S.W. 

 (ist Hour Oil. Commercial sample. ] 



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 (i hours hot).. 

 After acetylation (ij hours hot) 



Crude oil. 



= 0-9198 

 + 2-8 

 = 1-4609 



= 72 per cent. 

 = 84 per cent. 



Rectified portion distilling 

 below 190 C. 

 (93 per cent.) 



= 0-9190 

 + 2-7 

 = 1-4602 

 = 78 per cent. 

 = 91 per cent. 

 = 3 per cent. 

 = 2-97 

 = 24-88 

 = 6-05 percent, free alcohol. 



The resorcinol method was thus shown not to be suitable for cineol 

 determination in the oil of this species. The alcohols present were largely 

 terpineol and geraniol. 



EUCALYPTUS CNEORIFOLIA (a somewhat old sample). 

 Kangaroo Island, South Australia. 



Rectified portion distilling 

 Crude oil. below 190" C. 



(91 per cent.) 



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 (i hours hot) .. 

 After acetylation (ij hours hot) 



= 0-9304 



-2-4 



= 1-4677 



= 62 per cent. 



= 83 per cent. 



= 0-9198 

 -i-5 



= I-4637 

 = 68 per cent. 

 = 91 per cent. 

 = 6 per cent. 



= 9'55 



= 20-05 



= 2-9 per cent, free alcohol. 



It is thus evident that the resorcinol method is neither suitable for the 

 quantitative estimation of cineol in the oil of this species, nor in oils of this class, 

 and numerous instances of this will be found recorded in this work, under the 

 several species. 



THE PHOSPHORIC ACID METHOD. 



The phosphoric acid method for the determination of cineol in Eucalyptus 

 oils was originally discovered by Mr. L. R. Scammell, of Adelaide, South 

 Australia, in 1892, and was the outcome of an investigation on various samples 

 of cheap oils then being placed on the market. The process was used by Messrs. 

 Faulding & Co. for the manufacture of Eucalyptol, or cineol, which they shipped 

 to England. In 1894 the process was patented by Mr. Scammell, as Faulding's 



