182 



INHERITANCE IN RATS. 



Table 144 shows the classification of extracted hooded second Fa young obtained from 

 crossing first F2 hooded rats with wild rats. The hooded grandparent, d"9660, +3f , was 

 a grandson of 9 6955, +4, generation 12, on the side of both parents. The hooded grand- 

 parent, 0*9711, +3, was a grandson, on the side of one parent, of 9 5513, +4J, generation 

 10, and on the side of the other parent, of 96955, +4, generation 12. (See table 141.) 



TABLE 144. 



Table 145 is a combination of tables 142 to 144, in which the second F2 young are classi- 

 fied according to the grade of their first Fz hooded grandparent. 



TABLE 145. 



Table 146 shows the classification of generation 12, plus-selection series. This is an 

 enlargement of table 12 of Castle and Phillips. 



TABLE 146. 



