28 



INHERITANCE IN RABBITS 



slightly less, viz, 14 mm. So far, then, as table 16 is concerned, we get 

 no clear evidence of heterogeneity among the gametes formed by the 

 cross-breds produced by cross 3. 



Table 16. 



1 18 weeks. 



The female half-blood lop 175 (plate 3, fig. 10) produced by cross 3 

 was mated with the three-quarter-blood lop c?437 (cross 5), and produced 

 a litter of 5 young, the character of which is shown in table 17. 



These young early (16 to 18 weeks) attained a large size, indicating 

 conditions favorable for growth. In ear-length they fluctuated about 

 the mid-parental condition, which was exceeded by 2 individuals, while 

 3 fell short of it. All had ear-lengths intermediate between those of their 

 respective parents. The range of variation among them at 18 weeks 

 was 14 mm., exactly the same as in cross 3, from which the mother was 

 derived. The greatest deviations from the mid-parental were —11 (at 

 16 weeks) and -I-5 (at 18 weeks). No e^^dence is afforded of unusual 



