94 



THE INHERITANCE OF COLOR IN MICE. 



Cross 170. Giving Y, BrAg, and Br. 



Cross 171. Giving Y, BrAg, and W 



Cross 172. Giving Y, BrAg, Br, and W 



Yellow x brown agouti, giving ink nst and dilute dark-eyed young. 

 Cross 173. Giving Y, BAg, BrAg, and dBrAg. 



Cross 174. Giving Y, dY, and dBrAg. 



In the following matings the yellow parents were dilute, and of four different sorts, viz: 



Dilute black-eyed yellow, YzBriB^PiAzR; 

 Dilute black-eyed yellow, Y 2 BriB>d>P2R; 

 Dilute brown-eved yellow, YzBrjlzPiAiR; 

 Dilute brown-eyed yellow, YiBr^iJPJt. 



These four varieties are extremely difficult, if not impossible, to tell from one another by 

 superficial examination. The two brown-ej^cd types may, however, be distinguished at 

 times by their eye-color, wliich is, as in the corresponding intense types, always brown. 

 The following description will apply then to these four varieties: 



Eyes black or brown, ears pink. Ventral hairs much the same as in the intense yellow type. 

 Tail unpigmented. Dorsal hairs a dull heavy j'ellow with the characteristic washed-out 

 appearance of all dilute forms. Hairs at the base of the ears and around the anus are 

 indistinguishable from the rest of the coat. 



