484 



Profs. Percy Fraukland and Marshall Ward. 



Thus again in the case of this porcelain- filtered L. Katrine water there 

 ^vas the same rapid disappearance of the introduced B. coli communis. 



It is particularly remarkable that the B. coli communis has disappeared 

 more rapidly in both these sterile L. Katrine waters than in the un- 

 gterilised. 



Similar evidence of the disappearance of the typhoid and coli 

 bacilli in these sterile L. Katrine waters is afforded by the results of 

 the several examinations by phenol broth-culture, thus : 



Examinations of Typhoid-infected Sterilised Loch Katrine Waters by 

 Phenol Broth-culture. 



