and Related Colours in Cats. 



37 



dominant over blue in the male, but in the female the hetero- 

 zygote is the blue tortoiseshell. 



Creams may be obtained by pairing orange with blue, i.e. the 

 dilution may be transferred from the blue to the orange, yielding 

 cream; but this does not take place in all the kittens, since 

 orange, blue, and tortoiseshell may also appear. It seems also 

 that although in the female orange is not completely dominant 

 over black, yet it may contain recessive blue, for in one case 

 an orange female with blue in its ancestry, when paired with an 

 orange male, gave three tortoiseshell females and one blue male. 

 Orange may probably contain recessive cream in either sex, and 

 black is certainly a simple dominant over blue. 



To illustrate the above I give two genealogical tables *. 



(l) 



Orange g x Tabby Tort. ? Orange g x Black ? 





Blue g x Tort. ? 



! J 



Orange g 



X 



Black 



1 



L 



g x Tort. ? 



1 



i 



Orange $ x Black ? 



1 1 

 1 i 





Tort. ? 



j 



Black g 



1 



i 



X 



i 



1 



Orange ? 



. J 







(2) 



Tort. ? 



Orange x Orange Blue x Blue Cream g x Tort. 



(??<? tort. (from silver ? 



[ | | ? tabby strain) 



l , I I . I I , I 



Blue g x Blue ? Blue g x Orange ? Cream g x Cream ? 



L I L I L • I 



Blue g x Blue tort. ? 



L I 



Blue S x Cream ? 



Cream g 



Tabby tort. ¥ 



Blue g 



Cream ¥ 



3 Cream g g 

 1 Blue tort. ¥ 



* For the second table, with many others, I am indebted to Miss W. Beal ; for 

 the first, chiefly to Miss A. M. Boper. 



