1S2 



INHERITANCE IN RATS. 



Table 1 11 shows the chissification of extracted hooded second F s young obtained from 

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

 I grandson of v 8965, +4, generation 12, on the side of both parents. The hooded grand- 

 parent, d"9711, + 3i, 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 F 2 young are classi- 

 fied according to the grade of their first F 2 hooded grandparent. 



Table 145. 



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

 enlargement of table 12 of Castle and Phillips. 



Table 146. 



This is an 



