Without- 



Se)jfftrti)«* 



tjon. 



live Greneyatiew'X 



1 1 k I i 



f7 libtr-u. 





Fig. 2.4 — An exhibit set up in the Genetics Department of Cornell University in 1910, dis- 

 playing materials grown at the Station for Experimental Evolution in 1909. 



Fig. 2.5— The best eleven ears of the highest-yielding selfed line (F 29.70 in Table 2.7) 

 grown in 1911 {top row) ; the best eleven ears of the best Fi hybrid grown in the same year 

 (F 32.75 in Table 2.7) ; and the best eleven ears of a crossbred strain (F 55.84 in Table 2.7) 

 in which selling was completely prevented during five years. This shows the relative vari- 

 ability which is characteristic of these three types of families, the Fi being no more variable 

 than the inbred, while the crossbred is quite noticeably more variable. 



