IMPROVEMENT OF VARIETIES 



91 



ears, one borne high on the stalk and the other low, were 

 selected in the fall of 1902. Continuous selection was 

 practiced for six years, when a difference of about three 

 feet in height was secured in the average crop, as shown by 

 the table on previous page. 



Results were also obtained when selection was made 

 to increase or decrease the angle of the ear, the erect-ear 

 strain and declining-ear strain having average angles of 

 46° and 88.50° respectively, after six years. 



67. Selection for composition. — Composition can also 

 be modified by continuous selection, as shown by the 

 Illinois station.^ Ears of a single variety were selected for 

 high-protein, low-protein, high-oil, and low-oil content, 

 respectively. After ten years' selection, the high-protein 



TABLE XIV 



Ten Generations of Breeding Corn for Increase and 

 Decrease of Protein and Oil 



1 111. Agr. Exp. Sta., Bui. 128. 1908. 

 U. S. Dept. Agr., Farmers' Bui. 366 : .314. 



