THEORY OF EVOLUTION 



175 



25. Here one of the grand-parental types 

 reappears in large numbers, while the extreme 

 of the other grand-parental type did not re- 

 appear (in the counts obtained), although the 

 F 2 number would probably overlap the lower 



I! 



II 



FIG. 87. Cross of normal and fantail pigeons. (See Fig. 

 86.) The F 2 range is wider than that of F x . The normal grand- 

 parental type of 12 feathers was recovered in F, but the higher 

 numbers characteristic of fantails were not recovered. 



