EAR-SIZE 



19 



surpassed at i8 weeks of age the mid-parental car-length, while the other 

 one almost equaled it. Their weights at i8 weeks of age indicated that 

 the mid-parental weight would be attained at maturity. 



Table 4. — Cross 2. 



Under the head of mating 2 arc given the results of 2 dilTerent litters, 

 litter I consisting of 2 rabbits, litter 2 of 4. The weight of the mother 

 was surpassed by that of the ofTspring in 4 out of 6 cases, at the early age 

 of 18 to 20 weeks. Three of the 6 young had ear-lengths very similar to the 

 mid-parental car-length; the remaining 3 had ears somewhat shorter at 

 18 or 19 weeks old, and probably would not have attained at maturity 

 an ear-length equal to the mid-parental. Litter 2 is shown in plate 2, 

 fig. 6; the parents in figs. 5 and 8 of the same ])late. 



The 6 young produced by mating 3 were under-sized at 20 weeks of 

 age, which perhaps accounts for the fact that no one of them attained the 

 mid-parental ear-length, but all fell from 5 to 10 mm. short of it. 



In mating 4, 2 of the 3 young came within 2 mm. of attaining the mid- 

 parental ear-length; the third came within 5 mm. of it. 



