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. 
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