TABLES. 



39 



TABLE 7. Classification of generation 20, minus-selection aeries. 



TABLE 8. Classification of generation 21, minus-selection series. 



TABLE 9. Classification of extracted hooded third F z young produced by a 

 cross of plus-selected with wild rats. 



NOTE. Standard deviation of first F s was 0.73, that of second F s was 0.50 (tables 

 141 and 145, Publication No. 241). 



TABLE 10. Classification of extracted hooded first F z young from a cross of 



minus-selected with wild rats. 



