128 PRACTICAL CORN CULTURE 
machinery, the spring tension should be as loose as possible 
consistent with effective work. If considerable corn is cracked 
in shelling, the indications are that the corn was either too 
dry, or the sheller is not properly adjusted. 
In order to secure a uniformity, a corn grader should be 
used. There are hundreds of corn graders on the market. 
They range in price from five dollars for small ones to eight 
hundred dollars for large graders used in largé seed corn 
drying plants. The very cheapest corn graders will do better 
work than will the average farm fan mill. A good grader 
should take out all the large and small grains and about 
nine-tenths of the cracked kernels. 
It is necessary to take out from twenty per cent to forty 
per cent in order to have an even grade. The difference in 
yield between graded and ungraded seed is often as much 
as ten bushels per acre. This difference is due to the more 
even planting of graded seed, not because the smaller and 
larger kernels are poorer yielders. 
ADDITIONAL READING 
‘““The Study of Corn.’’ By Vernon M. Shoesmith. 
‘‘Corn.’’ By Bowman and Crossby. 
‘‘Seed Corn Must Make Good.’’ By L. C. Hutcheson. Corn. 
March, 1913. 
‘*Make Corn Growing Pay.’ 
19138. 
‘Getting Ready for This Year’s Corn Crop.’’ Twentieth 
Century Farmer. February 22, 1913. 
‘“Ten Bushels More Corn to the Acre.’’ By Robt. H. Moul- 
ton. Fruit Grower and Farmer. March, 1913. 
“It Pays to Test the Seed Corn.’? By Arthur Lumbrick. 
The Prairie Farmer. March 15, 1913. 
> The Fruit Grower and Farmer, 
