286 



Earle B. Phelps 



determinations of the numbers of organisms present were made at 

 intervals during the experiment, as indicated in the tabulated results. 

 In the following tables the full details of each experiment are 

 first given, including the actual bacterial counts. In order to compare 

 the various experiments, the bacterial results have been calculated 



EXPERIMENT i. 

 Started January 24, 1906. 



Concent, of 

 Salt 



(N/ 1, 000,000) 



12 



20 

 40 

 12 



20 

 40 





38 

 63 

 26 



Counts 



Initial 



380,000 

 400,000 

 350,000 

 370,000 

 410,000 

 400,000 



5 Min. 



125,000 

 45,000 

 25,000 



64 Hrs. 



6,000 



1,700 



300 



370,000 



460,000 



400,000 



24 



Hrs. 



42 



12 



9 



50,000 

 45.000 

 43.000 



Temperature, 2o°-22'^ 



EXPERIMENT 2. 

 Tap Water — Started January 29, 1906. 



Temperature, 20°-23'^ 



EXPERIMENT 3. 

 Started February 6, 1906. 



Temperature, 2o°-2 2'^ 



