BY R. GREIG-SMITH. 



335 



Piperitone is stronger than cineol, but not to any great extent. 



Pinene, as represented by the oils of E. dexlropinea and E. 

 Icevopinea, has a comparatively feeble action, although slightly 

 better than sesquiterpene. 



;vi'.-- 



15 30 60 MINUTE.S ™ WO 



Text-fig.7. The Constituents of the Eucalyptus Oils. 



The Oils of E. cnSorifolia and E. citriodora. — The oil of E. 

 cneorifolia, one of the " Mallee " group from Kangaroo Island, 

 contains cineol and aromadendral with a small amount of sesqui- 

 terpene. It should give high dilution numbers, and the expecta- 

 tion was fulfilled. The oil of E. citriodora contains 91% of the 

 aldehyde citronellal and a small amount of pinene, but no cineol. 



