36 



PIEBALD RATS AND SELECTION. 



Table 9. — Classification of generation 9, plus series. 



Table 10. — Classification of generation 10, plus series. 



Table 11. — Classification of generation 11, plus series. 



Grade of parents. 



Grade of offspring. 



2f 



3^ 



3f 



4 Ul 



4f 



Totals. 



Means. 



Regres- 

 sion. 



4|. 

 4i. 



2 

 87 

 25 

 16 



2 



7 



162 



87 



49 



13 



1 



2 



41 



65 



27 



5 



3 



Totalsor means, 3.97. . 2 



13 



22 132 



319 



143 1 46 



12 



11 



333 



214 



110 



25 



4 



3.75 

 3.70 

 3.87 

 3.81 

 3.91 

 3.94 





 .17 

 .13 

 .31 

 .34 

 .43 



697 



3.78 



.19 



