DISINFECTION STUDIES 



209 



Ooys 6 



Fig. '9. Experimext 9. The Death Rate", of Bact. cou iNfM/SOO Phosphate 

 Buffer op pH 7.1 at 0°, 10», 20°, 30°C. 



Parallel duplicate curves are omitted 



oTS^ 6 



Fio. 10. Experiment 10. The Death Rate op Bact . coli in M/500 Phosphate 

 Buffer of pH 8.0 at 0°, 10°, 20°, 30°C. 



The pH remained constant until the fortieth day, but was found to be 7.7 on 

 the sixtieth. 



