ILLINOIS DAIRYMEN'S ASSOCIATION. 229 



Table 2. — Some Fair Illustrations of Actual Results Obtained in Selection 



of Seed Corn. 

 (Protein, average per cent- 



50 ears 28 ears 10 Best 



200 selected by selected by best single 



average mechanical chemical seed seed 



Variety. seed ears, examination, analysis ears. ear. 



Boon County White . . 10.57 9.72 9.36 8.84 8.69 



Silver Mine 10.00 9.47 8.77 7.97 7.00 



Learning 11.96 11.36 10.79 10.08 8.82 



Learning 11.9o 12.44 13.33 14.03 14.63 



Learning 11.27 11.84 12.43 13.12 14.71 



Yellow Dent 11.14 11.64 12.11 12.55 13.24 



Riley's Favorite 11.02 11.38 12.41 12.99 15.78 



Burr's White 12.48* 12.88 14.36 14.87 15.71 



Burr's White 9.20** 9.10 7.77 7.56 7.08 



Learning 11.26 12.14*** 



Learning 11.26 10.67*** 



* Average protein content of ten field rows of Burr's White after four 

 years' breeding for high protein. 



** Originally from some stock of Burr's White as preceding, but bred 

 four years for low protein. 



*** Two lots or 42 ears each selected from the same lot of 200 ears 

 for two breeding plots, high protein and low protein, the seed for which is 

 selected by physical inspection and mechanical evamination but without 

 chemical analysis of individual ears. 



If the method of mechanical examination alone is employed in mak- 

 ing the chemical selection, then, if possible, there should be some chemi- 

 cal control of the work, at least until the breeder has become sufficiently 

 skilled, or has had sufficient experience, to feel that he knows how to 

 .nake a chemical selection of seed ears by mechanical examination of 

 kernels. Such a chemical control does not involve a large amount of 

 chemical work. In Illinois the Experiment Station offers such a chemical 

 control to farmers who will agree to make the selection of the best possi- 

 ble seed, both by physical inspection of ears and mechanical examination 

 of kernels and who will further agree to secure data and breed the corn 

 in accordance with our directions. 



This control is affected by analyzing only two samples of corn each 

 year; one composite sample of the rejected ears, five average kernels 



