206 



BAKNETT COHEN 



Figures 6 and 7 present the curves of the death rates observed. 

 These experiments are strictly comparable for they were done 



Hours 7 73 IS 2o~ IS 30 



Fia. 7. Experiment 7. The Death Rate of Bact. coli in M/500 Phthalatb 

 Buffer, pH 3.5, at 0°, 10°, 20°, 30°C. 



Closely parallel duplicate curves are omitted 



at the same time and with identical materials, and the marked 

 difference in resistance of the two organisms is at once apparent. 

 In the case of Bact. typJiosuvi (fig. G) the first portion of each 



