MULTIPLE FACTORS 



235 



times, etc. It would require a large number of off- 

 spring to prove the multiple factor hypothesis if the 

 reappearance of the grandparental types be de- 

 manded for such a proof. 



p 

 1 



F 



1 



F 



z 



Fig. 58. — Short-oared hy lop-carcd ral)l)it. Fi,s<mi of last; ]'\., dauKlitor 

 of ]''i liy his sister. (After C'astlo.) 



Several excellent cases of multiple factors have been 

 worked out with Indian corn. Height of plant 

 (as a concomitant of its vigor), length of ear, and 



