46 



It is worthy of notice here that the various characters by which the 72 

 strains considered in the above table are distinguished, group themselves 

 around an average or "mean" according to the law of Quetelet, that is, the 

 greatest number are found to possess the average condition of a given 

 character. This may be illustrated by taking the average length and weight 

 respectively, of the primary kernels of each strain thus : 



Number of strains having length of kernel 

 indicated in opposite column. 



Average length of kernel of each strain 

 in millimetres. 



Number of strains having weight per 100 

 kernels indicated in opposite column. 



Average weight of 100 kernels in each 

 strain. (Grams.) 



The situation indicated in the preceding tables may be expressed in still 

 another manner. Let us consider the second table in which the weight is 

 given. It was found in this case that the weights of 100 kernels from the 

 different strains fell into classes as follows: 



