For a long time the florist has been indebted to crossing and hybridizing for many of his best productions, but less has been done to improve our grains, fruits and vegetables by this means. Crossing is not a substitute for selection * s a means of improving plants, but it is a valuable addition to that method, and often enables one to arrive at more direct and definite results.
Crozier, A. A.
"Notes on crossing,"
Bulletin: Vol. 1
, Article 3.
Available at: http://lib.dr.iastate.edu/bulletin/vol1/iss1/3