INFLUENCE OF TEMPERATURE 53 



good straight line for the haemolysis. In the same 

 diagram are included some determinations by Miss 

 H. Chick regarding the time necessary for killing 

 Bacillus typhosus in hot water at different tempera- 

 tures. As the observed interval of temperature is 



E 



bo 

 o 



49 



51 



53 55 



Temperature 



Fig. ii. 



57 



59 



61 



rather small, io° C. or less, they give a straight line, 

 within the rather great errors of observation, and 

 a value of ^ = 92,000. This is about twice as great 

 as the /rvalue = 48,600 found for disinfection of 

 Bacillus par atyphosus by means of phenol (between 

 6° and 36 C). Cf. p. 55. In the same manner 

 the ^-value for haemolysis by means of hot water 



