BY R. GUEIG-SMITH. 347 



Tins may be due to the elimination of aromadendral during 

 rectification. 



The oil of the Braidwood variety of E. australicma is the best 

 and cheapest disinfecting oil (phenol-coefficient = 5*8 in 30 



minutes.) 



The oil of E. cneorifolia was the second best crude oil tested 

 (phenol-coefficient = 4 '8 in 30 minutes); its activity is probably 

 due to its aromadendral content. 



As in the ease of phenol, the addition of acid to the water used 

 in emulsifying the oils greatly increases the germicidal activity. 



I have to acknowledge the kindness of Messrs. Baker and Smith, 

 of the Technological Museum, in supplying me with specimens of 

 the oils, of Mr. H. G. Smith in giving details connected with the 

 oils, and of Mr. W. AV. L'Estrange, in giving much valuable 

 assistance. 



