MINUTES 



8 ip 12 16 20 25 30 40 60 



M 000 000 



0^ 1 ~2 3 4 5 6 8 10 12 16 20 25 40 60 80 120 



Fig. 23. Relation between death time of Bacterium coU and concen- 

 tration of disinfectants. The heavy horizontal bars (representing ranges 

 of death time) and the solid lines which join them refer to washed 

 bacteria, the multiple horizontal bars and the broken lines which 

 join them refer to suspensions containing 10% skim milk. Abscissa: 

 death time, on logarithmic scale; ordinate: concentration of disin- 

 fectant, on logarithmic scale. 



