330 



GKRMICIDAL ACTIVITY OF EUCALYPTI'S OILS, 11., 



It is apparent that phellandrenc is more efficient than cineol 

 as a germicide, if the only difference between the two oils lies in 

 the cineol and phellandrene. The low acidity of the Braid wood 

 oil shows that it had been recently distilled, as it had been given 

 out to be. It is one of the most efficient of the oils that have 

 been examined, the only stronger oil being the old specimen of 

 E. ciuerea, rect. 



The Phellandrene Oil of E. dives. —In the absence of pure 

 phellandrene, use was made of the oil of E. dives, which consists 

 largely of this constituent. There is also in it a quantity of 

 piperitone, the strongly smelling peppermint substance of the 

 Eucalypts. The oil of E. dives is not usually rectified, and is 

 extensively used in the notation of minerals.* 



Table xi. B. coli communis. 



f = or weaker. 



* Tbe use of this oil as a disinfectant for clothing was tested. It is a 

 sticky oil, and about the worst that could be employed for such purposes, 

 on account of its rather difficult removal with soap and water. This con- 

 sideration, however, did not occur to the writer until later. A suspension 

 of M. aureus in serum was absorbed on cotton mending and dried at 37° 

 for an hour. The infected twists were then inserted in dilutions of E. 

 dims and withdrawn at stated intervals (the excess dilution being removed 

 on porous gypsum strips) and inserted into broth. The lethal dilutions 

 were as follows : 



5 10 15 30 60 120 180 240 minutes. 



less than 5 20 



20 



30 



60 



80 



80 





