Growth and variation in maize. 



153 



1*0667 corresponding- to the observed distribution of the means in 

 series A (Table 16). The peaked curve on the other hand has a stan- 

 dard deviation of 0'1925 corresponding to the theoretical curve having 



6 12 ie 2 4 30 36 4 2 4 8 5 4 



MEAN QUINTILE POSITION 



Fig. 16. Diagram showing two normal curves with the same area and mean. The flat 

 curve has a standard deviation corresponding to the distrihution of the observed mean 

 quintile positions. The peaked curve has the standard deviation of the theoretical dis- 

 tributions of means on the assumption that the observations were distributed at random. 



the same area and mean as that for series A. The difference between 

 these two curves is striking and shows that the laws which govern 

 their formation are quite different. 



