10 



18 



10 



13 



1904 1905 1906 1507 1908 1909 I'JiO igu 191.5 



SELECTION FOR ROW-NIJHBER 

 IN CROSS-FERTILIZED MAIZE 



"■?58=^ 



^;2^"- 



»-^. 



;o>*\ 



SELECTIOtJ FOR RaJ-WIKDER 

 IN SELF-FEHTILIZEU MIZE 



1904 



1905 



1906 



1907 



1908 



1909 



1910 



1911 



1912 



Fig. 2.8 — Diagrams of the progressive results of selection for grain-row number under the 

 two systems of breeding: selling completely prevented in the upper diagram; selling the 

 sole method of breeding in the lower. The numbers on the lines indicate the numbers of 

 rows of grains on the parent ears. The circles show by their position on the scale at left the 

 average grain-row numbers of the resulting [progenies. 



