284 FIELD CROPS FOR THE COTTON-BELT 



because of the smallness of the reproductive organs but 

 because it also involves compHcated problems of selection 

 in order to isolate and fix'the valuable types from the mul- 

 tiplicity of forms that occur in the subsequent hybrid 

 generations. For this reason this method should be con- 

 fined to the professional breeder. Excellent results have 

 recently been secured at several stations from a selection 

 from the hybrid, Burt X Sixty-Day.^ 



1 U. S. Dep't of Agr., Bui. 99. 



