Fig. 1. Experiment 1. The Death Rate op Bact. typhosum in Double- 

 Distilled Water at 0°, 10° 20° 30°C. 



Logarithms of numbers of survivors are plotted as ordinates against time 

 intervals as abscissae. Duplicates at any temperature are marked (I) and (II). 

 Observed pH values of the water are noted along the curves. 



o Days 



Fio. 2. Experiment 2. The Death Rate of Bact. coli in Double-Distilled 

 Water at 0°, 10°, 20°, 30°C. 



Duplicates at any temperature arc marked: (I) and (II). Observed pH 

 values of the water are noted along the curves. 



194 



