90 



ILLINOIS ACADEMY OF SCIENCE 

 //VC#£S 



Figure 3 



The parent strains have been close-bred for so long that their 

 vigor is somewhat impaired, and the yield of grain is not as 

 high as in the ordinary Learning corn. In 1914 the High 

 Ear plot yielded 44.4 bushels per acre, the Low Ear plot 48.4 

 bushels, and the F 2 cross 66.4 bushels per acre, or 37 per cent 

 more than the higher yielding parent and 27 per cent more 

 than a standard strain of Learning growing close by. While 

 we have not the original stock from which the parent strains 

 sprang, with which to compare these yields, we are probably 

 safe in assuming that the vigor of the cross is at least as great 

 as in the original stock. 



We see, then, that the first generation cross between the high 

 and low eared strains gives a type of corn on which the height 

 of ear is intermediate between the two parents and which, 



