TABLES. 



39 



T.^BLE 7. — Classification of generation 20, minus-selection series. 



Table 8.— Classification of generation 21, minus-selection series. 



Table 9. — Classification of extracted hooded third Fi young produced by a 

 cross of plus-selected with wild rats. 



Note. Standard deviation of first F, was 0.73, that of second Fj was 0.50 (tables 

 141 and 145, Publication No. 241). 



Table 10. — Classification of extracted hooded first F2 young from a cross of 

 minus-selected with wild rats. 



