FACTOR RELATIONS IN QUANTITATIVE INHERITANCE 195 



depending many times upon some definite character change in the race, 

 for example, bush and Cupid sweet peas. It appears reasonable to 

 refer more complex size differences merely to differences in several such 

 definite characters. 



5. Factor systems affecting a single character have been worked out 

 definitely, which in the complexity of the interrelations they display, 

 rival those interpretations which have been postulated for cases of 

 quantitative inheritance. The trend of investigation seems to establish 

 more firmly all the time the probable validity of the multiple factor 

 interpretation of quantitative inheritance. 



