EAR-SIZE 



23 



size and yet to attain a normal or nearly normal general size. It is not 

 to be expected, however, that such an animal will transmit to young reared 

 under normal conditions the diminished ear-size which it shows, but rather 

 the ear-size which it would have attained had it been reared under normal 

 conditions. 



TABLE 8. Cross 5. 



CROSS 6. HALF-BLOOD LOPS MATED INTER SE. 



The same female half-blood lop already mentioned (9 167, cross 8), 

 was mated with a male produced by cross i (^248). Their young con- 

 stitute an F 2 generation of half-blood lops. 



In this litter the deviations from the mid-parental ear-length are all, 

 with one exception, positive (upward). This result accords with that 

 observed among the young of this same mother (9 167), in connection 

 with cross 5. She evidently transmitted a greater ear-length than she 

 manifested. 



The range of variation, 35 mm., while high, does not exceed that found 

 among lop-eared rabbits mated inter se, as is clear from a comparison of 

 fig. 2 with fig. 3, the former showing growth-curves for lop-eared rabbits, 

 the latter for the litter of F 2 half-blood rabbits under consideration. The 

 range of variation in this cross also agrees exactly with that observed in 

 cross 5, in which the same mother was mated with a full-blood lop. We 

 get, therefore, from this case no evidence of Mendelian splitting as regards 

 the character ear-length. 



