78 



MORPHOLOGIC VARIATION 



tion curve as pronounced as was found to be the case in the agar 

 culture, which had a much higher growth rate. In Culture II there 



S hrs. 

 I M I LI I I I M 



10 hrs. 



LI M LI I I I I I I. 



h hxs. 12 hrs. 



Abscissae: 1 unit^lfx Ordinates: 1 unit=2% 



Fig. 19. Frequency Distributions of Cells According to Length at 

 Different Stages of Growth, B. megatherium, Culture II. 



is very little change other than skewness and a shifting of the mode. 

 In Culture III the skewness, shifting of the mode, and extension 

 of the base are still more apparent, and in the three hour sample, 



