68 



MORPHOLOGIC VARIATION 



320 



2 2U0 



^160 - 



go 







1 I I I ' I I n I I I i I I i i I I I I I I I 1 I I I I I 1/ 



ii 



Number of Cells 

 Average Length of Cells 

 Total Cell Length 



V / 



» 'M I I I i I I i I I I I I I I I I I I I I I I I I I I I 



60 



120 180 

 Minutes 



Micro-colony I 



2^10 



300 



£160 



I I I I I I M I I I I I I I I I I I M M I I I I I I I I I 



'«' "I I I I I I I I I I I I I I I I I I I I I I I I I M 



60 



120 ISO 



Minutes 



2kQ 



300 



Micro-colony II. 

 ^^ M I I I I I I I I I I I I I I I I I I I M 



ol I I II I I I I I I I II I I M I M 



60 120 150 



Minutes 

 Micro-colony III. 



Fig. 13. Growth Curves and Variations in Cell Size in Growing Micro- 

 colonies OF B. megatherium. 

 From "Morphologic Variations of Bacteria in the Lag Phase." Reproduced 

 through the courtesy of the Journal of Infectious Diseases (1926, 38, 54). 



