Extent iiil Oil of A (JO, 



369 



alcohol. The addition of aqueous ferric chloride solution to this 

 alcoholic .solution produced a red coloration. Also a drop of strong 

 nitric acid, added to a ^eak aqueous solution, caused a magenta 

 coloration. There was. however, insufficient phenol to allow of any 

 further examination. 



Aldehi/c/es. — The next step in the exanii nation was the i.solation 

 and identification of aldehydes. The oil. after the removal of the 

 phenol, was well washed with water and then treated with a satui-- 

 ated a<|ueou.s solution of sodium l)isulphite. with repeated shakings 

 for several hours. No crystalline cuiiipimnd was formed, and tlie 

 .aqueous portion on investigation showed no traces of any' aldeliydic 

 ■compound having been formed. Similai- examinations of the 

 fractions boiling below 170 deg. C. and al)ove 190 deg. C. respec- 

 tivelv also gave negative results, so there can be no doubt that 

 aldehydes, so often occurring in and depreciating the value of 

 .eucalyptus oils, are absent from this oil. 



160" Cent. 180' -200' 



Temperature of Oil Distilliii'r. 



Fractional Dif<t Hint ion. 



To isolate, as far as possible, the remaining constituents iif the 

 oil, fractional distillation was resorted to. The cleared oil was 

 fractionated to identify the substances present in the oil. The crude 

 oil was also fractionated and the physical properties of the fractions 

 •examined [vide Table II.]. The accompanying graph shows the 

 ■distillation curves for both crude and cleared oils. 



