530 



Profs. Percy Frankland and Marshall Ward. 



butable to the circumstance that the number of different kinds of 

 bacteria in the deep well water is much more limited than in ordinary 

 surface waters. 



For the practical hygienic application of these experimental 

 observations, reference should be made to the final conclusions at the 

 end of this Report, see p. >43. 



Further Experiments on the Influence of the Addition of Common Salt 

 to Water containing the Typhoid Bacillus. 



The several waters prepared for the last series of experiments were 

 also made to serve the purpose of verifying the remarkable results 

 previously obtained (see p. 434, et seq.) by the addition of common 

 salt to typhoid-infected waters. 



These experiments were commenced on 12.2.1894, on which day' 

 some of each of the following waters (for full particulars concerning 

 them, see p. 519) received 1 per cent, of pure sterile sodium chloride 

 respectively : 



(a.) Typhoid-infected steam- sterilised Thames water. 



(6.) Typhoid-infected steam-sterilised Thames ivater, inoculated with 



a few drops of unsterile Thames water. 

 (c.) Uninfected unsterilised Thames water. 

 (d.) Typhoid-infected unsterilised Thames water. 



These waters, to each of which 1 per cent, of sodium chloride had 

 been added, were preserved in a dark cupboard at a temperature of 

 9 11 C., and were submitted to periodical examination along with 

 the several waters of the last series, with which they were to be 

 compared. 



Uninfected Unsterilised Thames Water to which 1 per cent, of 

 Sodium Chloride was added on 12.2.1894. 



