Fig. 21. — Kars of Hogue’s Yellow Dent corn partially fertilized by Ne- 
braska White Prize. The pure and hybrid kernels may easily be 
separated, because of xenia, in a study of the immediate effect of 
foreign pollen on kernel weight. These ears illustrate the possibil- 
ity of experimental error in such studies resulting from place effect 
in the unequal distribution of pure and hybrid kernels thruout the 
«ar. This place effect may be largely overcome by comparing such 
kernels in adjacent pairs only. 
