Growth and variation in maize. 



147 



14. 

 B. 



deviation of each plant in Series B arranged accord- 

 quintile classes. 



tile classes. 



This discussion will be begun with a study of the mean qmntile 

 positions of the individual plants. The data can best be presented in 

 the form of frequency distributions of these means. Since there are 

 not more than .55 plants in any series it is necessary to choose rather 

 large class units to obtain an - approach to a smooth distribution. 

 Further since the range is strictly limited, equal to four quintiles 

 (cf. Fig. 5), it is necessary to choose a class unit which will 

 divide the range equally. "We have used a class unit of O'S of a 

 quintile since smaller units would give very few observations in some 

 classes. 



The frequency distributions of these means are given in tables 13, 

 14 and 1.5. In these tables there are also given the numbers of the 



10* 



