334 



GERMICIDAL ACTIVITY OF EUCALYPTUS OILS, 11., 



of E. dextropiuea, and of E. Icevopinea, both of which consist 

 very largely of pinene. 



* = or stronger. 



There can be no doubt that of all the oils and their con- 

 stituents that have so far been tested in aqueous dilutions, 

 aromadendral is by far the most efficient germicide. It is about 

 seven times stronger than cineol. Its bactericidal power does not 

 appear to be reduced to any great extent beyond the expected 

 proportion when it is mixed with cineol, so that its presence in 

 any oil should raise the efficiency of that oil. 



Previous experiments with the sesquiterpene oil of E. iiova- 

 anglica showed that, when dissolved in olive oil, it was the most 

 inert towards B. coli communis. This was borne out by its 

 behaviour in aqueous dilutions; its germicidal power is very 

 feeble. 



