318 



GERMICIDAL ACTIVITY OF EUCALYPTUS OILS, 11., 



Table iii.a. B. coli communis. 

 Phenol with short Exposures. 



* Many times. 

 As determined from the results on Table iii., the probable 

 effective exposures for cineol at 15 and 30 minutes are slightly 

 higher than those as determined from Table ii., but this differ- 

 ence is the result of the methods, the bottle giving a speedier 

 distribution than the tube, and consequently a higher efficiency. 



6. 



2 

 O 

 h 



O 



20% 



25'. 



3 ■ ■ 33'. 



2-- 50*. 



1- -CINEOL 



1 ? • A 5 S MINUTES 



Text fig. i. — Cineol with Small Quantities of Water. 

 The necessity for the presence of a sufficiency of water in 

 accelerating the action of cineol is shown by the fact, as deter- 

 mined by Cuthbert Hall, that when comparatively dry bacteria, 

 such as are taken from an agar culture, are added to pure cineol, 

 the lethal exposure may vary up to eight hours. With the small 

 quantity of water contained in a few drops of a broth culture, 



