88 BREEDING 



die before the age at which the characters of the 

 litters are noted, than normal ones do. But to 

 return to the actual reappearance of the waltzing 

 character in the second hybrid generation. The 

 waltzing of the " extracted " waltzers, as the 

 individuals of this generation which manifest this 

 character are called, does not differ from that of 

 individuals of the pure race, except that in occasional 

 individuals it seems to be accentuated. 



The waltzing character, when it reappears in the 

 second hybrid generation, is not confined to mice 

 coloured like the pure waltzer, No. 2 ; that is to 

 say, it does not only occur amongst the mice of 

 Group C, but amongst those of Group A and B 

 also. Waltzing representatives of each of the three 

 groups are shown at No. 4, No. 6 and No. 10. We 

 are now in view of a new and very important 

 subject. Hitherto we have been considering the 

 relation to one another of two characters which 

 stand to one another in the relation of dominant 

 and recessive — i.e. characters which constitute a 

 single pair, and affect the same organ or feature of 

 the plant or animal. We now come in view of the 

 question : What is the relation between members of 

 distinct pairs of characters — ^i.e. characters of distinct 

 features of the animal or plant — for instance, the 

 colour of a mouse and its mode of progression ? The 

 answer in this case is very simple. There is no 

 relation. The colour of a mouse and the nature of 

 its movements, i.e. whether normal or " waltzing," are 

 inherited entirely independently of one another. The 



