Growth and variation in maize. 



133 



Fig. 8. 

 Changes in the root- 

 mean-square devia- 

 tion as measured 

 from the theoretical 

 mean. For plants 

 starting in a given 

 quintile. 



Series A ; 



„ B ; 



„ C 



The lower dotted 

 line represents the 

 average standard 

 deviation of simple 

 sampling. 



I JI M IF 



aUINTILE IN WHICH PLANTS START 



Fig. 9. 

 Changes in the root- 

 mean-sqnare devia- 

 tion as measured 

 from the theore tical 

 mean. For plants 

 ending in a given 



quintile. 

 Series designated as 



in Fig. 8. 



I TL M W F 



aUINTILE IN WHICH PLANTS END. 



