ii6 GROWTH 



no lag phase. When once growth has started, it is unrestricted 

 and follows the logarithmic law, for which reason this phase 

 often is termed the logarithmic phase. This is followed by a 



FIG. 10. 



period of retardation due to the operation of factors such as 

 the accumulation of carbon dioxide and the lack of oxygen. 

 This is a normal sequence : but departures from the normal 

 may result on varying the conditions of growth ; thus if the 



