496 



FOOD REQUIREMENTS 



lo^arithins of 

 numbers 



— I 1 1 r— I 1 1 1 1 I ' r 



TIME 



Figure 129. Hypothetical modifications (curves B-G) of the normal growth of a 

 population (curve A), from the initial stationary to the maximal stationary phase. 



certain medium might produce any one of several effects: (1) The 

 maximal population might be increased without any appreciable effect 

 on the growth rate; that is, the length of the logarithmic phase might 

 be increased without any change in the division rate (curve B, Fig. 129), 

 as compared with that in the control medium (curve A). (2) The 

 growth rate might be increased without a change in density in the 

 maximal stationary phase (curve C). (3) Both the growth rate and the 

 maximal density of population might be increased (curve D). (4) The 



