Plant Breeding 



279 



Bureau of Agriculture, P.I. 



Fig. 177. Four types of corn {Zea mays) : sweet, dent, flint, and pop — mutant varieties 

 that have been selected, each for a particular quality, since prehistoric times. 



perennial plants after a desirable variety has been produced. 

 In this way the plant grower avoids cross-polKnation and the 

 variations that appear when many cultivated crops are grown 

 from seed. The best ways of discovering, selecting, hybridizing, 

 and propagating particular crop plants may be found described 

 in recent pubhcations devoted to plant breeding. Much Htera- 

 ture on the subject may be secured from your state experiment 

 station and from the United States Department of Agriculture. 



Babcock and Clausen. 

 Company. 



REFERENCE 



Genetics in. Relation to Agriculture. 



McGraw-Hill Book 



