104 



Miscellanea 



The Influeme of Ancestrij. 



The above tables show that hybrids with the coloiu- of the house mouse all over (except the 

 lielly) appear only in the litters of pure-bred albinos, i.e. 3c in Gross 7, and 5c in Gross 8, 

 4 c in Gross 12, 2 c in Gross 13, and 1 c in Gross 20, whereas they do not apj^ear in the litters of 

 cross-bred mothers. Of coui-se so small a number of trials does not prove a definite rule : bat the 

 resiilt observed may be connected with the fact tliat von GuaiUi who used albinos in-bred for 29 

 generations always got hybrids identical with the house niotise. And it looks as if it could be 

 Said that the niore in-bred an albino is the less power it has of transinitting its whiteness. But 

 many niore crosses must be made before any definite statenient can be niade on this point. 





/ ^ 



Fio. 1. 







m^ -^, 



riä^:^ 



Fio. 3. 



,•'*?•' 



Fig. 4. 



