Report on tlie Bacteriology of Water. 



435 



On December 10 spores were sown in normal gelatine at 22 C. afc 

 10.30, and put into measurement at 3.30. 



Curve 131, p. 434. 

 The doubling periods are (normal) as follows : 



41 -5 83 M = 4-0 P.M. 5.21 P.M. = 81 minutes at 17 C. 

 83 -0166 = 5.21 

 166 -0332 = 6.40 



6.40 

 8.10 



= 79 

 = 90 



17 C. 



1716 -2517 -5 



0. 



This shows very clearly the steady growth and equal doubling 

 periods at constant temperature, and, at the same time, how slight 

 an alteration in the temperature (causing variation either way) 

 suffices to slow the growth. 



Another segment in the same drop was now selected, and measured 

 as follows : 



